Treating Medicaid Patients With Hepatitis C: Clinical and Economic Impact

February 16, 2017
Zobair Younossi, MD
Zobair Younossi, MD

,
Stuart C. Gordon, MD
Stuart C. Gordon, MD

,
Aijaz Ahmed, MD
Aijaz Ahmed, MD

,
Douglas Dieterich, MD
Douglas Dieterich, MD

,
Sammy Saab, MD
Sammy Saab, MD

,
Rachel Beckerman, PhD
Rachel Beckerman, PhD

Volume 23, Issue 2

Hepatitis C virus treatment is often restricted in Medicaid patients. This analysis evaluates the clinical and cost impacts of treating all Medicaid patients versus the current status quo.

ABSTRACT

Objectives: To estimate change in chronic hepatitis C virus (HCV) disease and the economic burden associated with comprehensive treatment of the chronic HCV—infected Medicaid population.

Study Design: Decision-analytic Markov model.

Methods: Treatment-naïve patients with genotype 1 chronic HCV were followed over a lifetime horizon from the third-party payer perspective. Patients entered the model insured under Medicaid and were treated under state-specific restrictions by Metavir fibrosis stage (base case) or all treated (all-patient strategy) with an approved all-oral regimen (ledipasvir/sofosbuvir [LDV/SOF] for 8 weeks or 12 weeks, depending on cirrhosis status, viral load, and state-specific LDV/SOF restrictions). Untreated patients were assumed to age into Medicare at 65 years, where they were treated with LDV/SOF without restriction by fibrotic stage.

Results: The sustained virologic response (SVR) rate of the current Medicaid LDV/SOF restriction strategy was 75.2% versus 95.9% if all LDV/SOF-eligible patients were treated under Medicaid. Treating all eligible Medicaid patients with LDV/SOF, regardless of fibrotic stage, was projected to result in 36,752 fewer cases of cirrhosis; 1739 fewer liver transplants; 8169 fewer cases of hepatocellular carcinoma; 16,173 fewer HCV-related deaths; 0.84 additional life-years per patient; and 1.03 additional quality-adjusted life-years per patient. Treating all Medicaid patients with chronic HCV using LDV/SOF resulted in a 39.4% ($3.8 billion) savings and decreased the proportion of total costs attributable to downstream costs of care to 18.3%.

Conclusions: A “treat all” strategy in a Medicaid population resulted in superior SVRs, substantial reductions in downstream negative clinical outcomes, and considerable cost savings. Current restrictive state policies regarding HCV treatment in Medicaid populations must be reassessed in light of these data.

Am J Manag Care. 2017;23(2):107-112

Takeaway Points

A restrictive Medicaid policy in many states limits hepatitis C virus (HCV) treatment to patients with severe disease, leading to suboptimal treatment outcomes, high patient burden, and excess costs. This analysis estimated change in HCV disease and the economic burden associated with comprehensive treatment of eligible Medicaid patients with ledipasvir/sofosbuvir (LDV/SOF). A “treat all” strategy led to:

  • Increased sustained virologic response rates were 95.9% if all LDV/SOF-eligible patients were treated under Medicaid versus 75.2% under the current Medicaid LDV/SOF restriction strategy.
  • Improved clinical outcomes: 36,752 fewer cases of cirrhosis; 1739 fewer liver transplants; 8169 fewer cases of hepatocellular carcinoma; 16,173 fewer HCV-related deaths; 0.84 additional life-years per patient; and 1.03 additional quality-adjusted life-years per patient.
  • A $3.8-billion overall savings in healthcare costs.

Approximately 3.5 million Americans are infected with chronic hepatitis C virus (HCV),1 with the majority born between 1945 and 1965 and considered part of the baby boomer generation. HCV is a systemic disease with both hepatic and extrahepatic clinical manifestations2 that also has negative impacts on patient-reported outcomes (PROs),3 such as fatigue and decreased work productivity.4,5 These manifestations are associated with significant direct and indirect costs to individuals, their families, and society that increase in parallel with disease severity and the need for liver transplantation.4,5

Until recently, available treatments for HCV had limited efficacy and were often poorly tolerated; few patients received treatment and many remained uncured.6,7 A number of barriers existed to curing HCV. First, conventional treatments were less tolerable than current regimes and had low effectiveness.6 Second, risk-based screening for HCV failed to identify many patients with the disease.7 Third, linking patients who are HCV-positive to care was suboptimal, with less than 40% of diagnosed patients receiving follow-up care.8-10 Fourth, patients with HCV often lacked insurance coverage and frequently had psychiatric and clinical contraindications to interferon, leading to less than one-third being eligible for, and having access to, treatment.11 These factors contributed to an epidemic of advanced liver disease, cirrhosis, and hepatocellular carcinoma (HCC) in the United States that led to increases in mortality, especially among men, blacks, and those aged 55 to 64 years.12,13

Between 1996 and 2006, the prevalence of cirrhosis and decompensated cirrhosis in patients with HCV more than doubled, and the prevalence of HCC increased more than 20-fold.14 Further, the prevalence of HCV is disproportionally higher in inner cities in the United States and among those who are eligible for Medicaid.15

Data from 2012 suggest that 12.5% of liver transplant patients with HCV were covered by Medicaid. Considering that the average cost of a liver transplant due to HCV is $188,000,16 Medicaid pays an estimated $147 million annually for liver transplantation, and there is additional significant cost for posttransplant immunosuppression and management of resulting complications. These costs are likely underestimated because many patients never receive transplants and require repeated hospitalization for complications of cirrhosis and HCC.14 Furthermore, premature death of patients with HCV leads to significant societal costs.17,18

Several highly effective, well-tolerated targeted treatments for HCV, such as sofosbuvir (SOF)-based regimens, have been developed over the last 5 years. The cost of these more effective regimens is higher than for older regimens; however, the cost per cure is lower and the regimens are generally considered to be highly cost-effective.6,23,24 It has been well established that universal, immediate treatment with these all-oral, interferon-free highly effective targeted regimens is cost-effective and decreases downstream medical costs, due primarily to the avoidance of liver-related complications.19-21 Furthermore, in the United States, marketplace competition has reduced the net cost of these drugs as manufacturers provide substantial discounts for Medicaid patients. Despite these factors, a recent study from the TRIO registry found that Medicaid was the least likely payer to cover HCV treatment22; states that do cover HCV treatment under Medicaid typically subject newer regimens to reimbursement restrictions by fibrotic stage, patient characteristic (eg, not reimbursed in intravenous drug users), or prescriber type (eg, hepatologist only).23

As patients with HCV reach Medicare age, the cost of care will be shifted to Medicare, where current drug discounts do not exist, but full coverage is possible. In this context, we used a decision-analytic model to estimate the reduction of disease and economic burden of immediate treatment of Medicaid patients with HCV with highly effective all-oral regimens versus delayed treatment in Medicare.

METHODS

Model Structure

We constructed a decision-analytic Markov model, described previously,21 which followed a cohort of treatment-naïve (TN) patients with genotype 1 (GT1) mono-infected chronic HCV over a lifetime horizon from the third-party payer perspective. Patients entered the model insured under Medicaid and were treated or untreated with an approved all-oral regimen (ledipasvir/SOF [LDV/SOF] 8 weeks [W] or 12W, depending on cirrhotic status, viral load, and state-specific LDV/SOF restrictions). Untreated patients were assumed to age into Medicare at 65 years, after which they were treated with LDV/SOF without restriction by fibrotic stage. No retreatment of patients previously treated with an LDV/SOF regimen was permitted in Medicare.

Discounting of costs and outcomes was assumed at 3%. The model compared the health and cost consequences of treatment under current Medicaid state-specific restrictions by Metavir fibrosis stage (current situation) versus treatment in Medicaid without restriction by fibrotic stage (comparative situation).

Population Inputs

Medicaid patients were assumed to enter the model with a mean age of 43 years.15,24 The number of patients with HCV covered under each state’s Medicaid program was sourced from claims analyses24 (and Gilead Sciences confidential data on file) and inflated to 2015 numbers based on the calculated growth rate of the national population (eAppendix Table A [eAppendices available at ajmc.com]).25

According to sources and Gilead Sciences internal data on file, assumptions included 70% with GT1,26 100% were aware of their infection, 60% had a viral load under 6 million copies and thus were potentially eligible for LDV/SOF 8W,27,28 87% were TN,29 82% were monoinfected,30,31 and 83% were noncirrhotic according to internal Ipsos data on file. These inputs were assumed to apply uniformly across all state Medicaid populations.

A recent Medicaid policy audit for SOF23 was used to inform restrictions for LDV/SOF; restrictions for LDV/SOF were assumed to be identical to SOF restrictions. States without any data for SOF restrictions by Metavir fibrosis stage were excluded from the analysis (15.3% of state Medicaid patients) and not modeled.

Clinical Inputs

Transition probabilities and utilities have been described previously21 and were obtained from the literature and hepatologist consensus. Transition probabilities and utilities were assumed to be identical for Medicaid and Medicare patients, although background mortality was age-adjusted as patients progressed through the model. These inputs are summarized in eAppendix Tables B, C, and D.

Costing Inputs

Wholesale acquisition costs (WAC) for LDV/SOF 8W and 12W were sourced from Red Book (Micromedex, Greenwood Village, Colorado) and reported in 2014 US$. In the base case, no price increases for LDV/SOF were assumed over the time horizon of the model. A best price rebate to Medicaid of 50% of the WAC for LDV/SOF was assumed (Medicaid 8W price: $31,500; Medicaid 12W price: $47,250). To derive Medicare prices for LDV/SOF 22 years into the future, an LDV/SOF annual WAC price increase of 2.6% was assumed, which was derived from the rate of historical price increases for a market basket of 13 antivirals indicated for the treatment of HIV (5.6%), launched in the United States between 2005 and 2012, net of the annual rate of inflation over this time period (3%). Currently marketed HCV direct-acting antivirals (DAAs) have not been on the market enough time (<4 years) to robustly extrapolate price increases over a 22-year horizon. LDV/SOF’s rebate in Medicare was assumed to be 25% (Medicare future 8W price: $83,108.18; Medicare future 12W price: $124,662.26). Rebate assumptions were based on the magnitude of the rebates currently offered for LDV/SOF to Medicare and Medicaid.32

Health state and monitoring costs for the Medicare population are reported in 2014 US$ and are summarized in eAppendix Table E based on our previously developed model.21 An inflation factor was not applied for medical costs, as, unlike for pharmacy costs, these were not assumed to increase at a rate faster than that of inflation. These were adapted to a Medicaid population by applying the national Medicaid-to-Medicare fee ratio of 0.66, sourced from the Kaiser Family Foundation.33

RESULTS

Current Medicaid Restrictions

A total of 120,980 Medicaid patients with chronic HCV were included: 60,248 receiving LDV/SOF 8W; 40,165 noncirrhotic patients receiving LDV/SOF 12W; and 20,567 compensated cirrhosis patients receiving LDV/SOF 12W. Under current Medicaid restrictions, 4.2%, 49.6%, and 6.8% of Medicaid patients with HCV GT1 could access LDV/SOF treatment only at Metavir fibrosis stages F2, F3, or F4, respectively (Figure 1).

Health Outcomes

In the aggregate (ie, including treated and untreated patients to calculate a weighted average), the SVR rate of the current Medicaid LDV/SOF restriction strategy was 75.2% versus 95.9% if all potentially LDV/SOF-eligible patients were treated (Table). Under current restrictions, 9618 patients potentially eligible for LDV/SOF 8W were assumed to age into Medicare as compensated cirrhotics and become ineligible for 8W treatment. An additional 25,774 patients would age into Medicare with decompensated cirrhosis or hepatocellular carcinoma or as liver transplant patients (or die due to liver-related mortality) and become ineligible for LDV/SOF 12W (Table).

Relative to current restrictions, treating all eligible Medicaid patients with LDV/SOF regardless of fibrotic stage would result in 36,752 fewer cases of cirrhosis (—87%); 1739 fewer liver transplants (–81%); 8169 fewer cases of hepatocellular carcinoma (–73%); 16,173 fewer HCV-related deaths (–77%); 0.84 additional life-years per patient (+4%); and 1.03 additional quality-adjusted life-years (QALYs) per patient (+6%), given that earlier treatment with LDV/SOF universally resulted in better health outcomes (eAppendix Table F).

Cost Outcomes

Under the current scenario of Medicaid LDV/SOF restrictions, the total costs of treating the HCV cohort totaled $9.7 billion, with the majority of costs (50.4%) attributable to downstream costs of care (ie, hospitalization costs, outpatient costs, and non-LDV/SOF pharmacy costs). Treating all Medicaid patients with chronic HCV using LDV/SOF led to a 39.4% ($3.8 billion) savings over the model time horizon (Figure 2) and decreased the relative proportion of total costs attributable to downstream costs of care to 18.3%.

Although the largest cost savings were attributable to downstream medical cost offsets, pharmacy costs attributable to LDV/SOF treatment decreased 2%, from $4.84 billion to $4.75 billion; this is due in part to the 9618 patients potentially eligible for LDV/SOF 8W treatment under Medicaid at the onset of the model who age into Medicare as compensated cirrhotics and can only receive treatment with the 12W regimen. Additional LDV/SOF cost savings result from treating a larger number of patients under Medicaid and the lower price for LDV/SOF under this scheme versus Medicare ($31,500 vs $83,108.18 [inflation-adjusted future price] for LDV/SOF 8W).

Under the current scenario of Medicaid LDV/SOF restrictions, the aggregate cost per SVR across the entire patient cohort—patients treated in Medicaid, patients treated in Medicare, and patients unable to be treated—was $51,809. Treating all Medicaid patients with LDV/SOF led to a 19.8% ($10,282) savings per SVR and was dominant from a cost-effectiveness (cost per life-year gained, cost per QALY gained) standpoint, given that earlier treatment with LDV/SOF resulted in better health and cost outcomes (eAppendix Tables F and G).

DISCUSSION

Access to HCV treatment under current state Medicaid programs is highly heterogeneous. Although HCV treatment qualification has become less stringent in some states, others refuse coverage, have instituted criteria for only treating patients with advanced fibrosis, or have not yet considered adding DAAs to their formularies.23,34 This strategy is flawed: first, patients with advanced fibrosis are more difficult to treat;35 second, fibrosis is a surrogate for liver-related mortality and fails to account for other negative impacts of HCV on patients and their well-being. In fact, evidence suggests that patients with early-stage fibrosis experience at least equivalent PROs and work productivity benefits from an HCV cure compared with those with more severe disease.36

The confluence of high HCV prevalence in the Medicaid population and lack of access to treatment may result in individual and societal harm and has cost implications beyond Medicaid. Although full coverage is possible as patients with HCV age in to Medicare, Medicaid-level drug discounts are not offered, thereby increasing the acquisition cost of HCV drugs for the population not treated earlier in their disease. Further, these policies disproportionately affect economic disadvantaged populations that rely on Medicaid, creating significant health disparities for aging and minority populations.

To our knowledge, this is the first study to estimate the HCV burden to both Medicare and Medicaid resulting from Medicaid HCV treatment restrictions. This study provides evidence that the current Medicaid strategy is flawed in providing treatment to different patients based on their state of residence. The current Medicaid strategy is estimated to result in 27,000 excess cases of cirrhosis and almost 10,000 excess cases of decompensated cirrhosis, leading to over 1700 liver transplants, over 8000 cases of HCC, and over 16,000 HCV-related deaths. This analysis likely underestimates the burden of HCV infection because it does not account for the negative impact of HCC-related extrahepatic diseases and PROs.37

Curing Medicaid patients with HCV using an extended “treat all” strategy could reduce the risk of complications, cirrhosis, HCC, the need for liver transplantation, and liver-related deaths. Given the large number of patients with HCV, we acknowledge that such a strategy would require up-front investment in the context of state Medicaid budget constraints; however, this strategy would ultimately lead to cost savings for CMS by reducing the future burden to Medicare and the costs associated with HCV morbidity and mortality. Additionally, we believe that an HCV cure will lead to substantial improvement in PROs and work productivity. Most critically, a “treat all” strategy will reduce the health disparities caused by the current Medicaid strategy, which primarily affects minorities and baby boomers who are approaching Medicare age.

This analysis was conducted conservatively, excluding 15% of Medicaid patients for whom the restriction status of LDV/SOF was not publically available; this potentially underestimates the full impact of lifting Medicaid coverage restrictions. The restriction status of LDV/SOF was inferred from published restrictions of SOF, which may lead to uncertainty. This analysis used clinical trial data rather than real-world data as model inputs for SVR rates; however, recent studies (ie, HCV-TARGET38) have shown that real-world and clinical trial SVR rates with all-oral ribavirin-free regimens like LDV/SOF are similar. Our model structure only allowed for patients to receive treatment in Medicaid once as they entered the model and did not allow for potential treatment at subsequent time points in Medicaid as patients continued to be monitored and progress to more severe fibrosis stages; thus, the number of patients ineligible to receive treatment in Medicare may be overestimated. Finally, this analysis assumed that all chronic HCV Medicaid patients eligible for treatment were aged 43 years and aged into Medicare at 65 years, which may not reflect real-world demographics and coverage dynamics (eg, dual-eligible patients).

CONCLUSIONS

Institution of a less restrictive “treat all” strategy in Medicaid patients was associated with clinical outcome and cost benefits. Based on these data, we believe it is time to develop a national strategy to eradicate HCV from the United States regardless of payer status. Such a strategy requires collaboration among private payers, governmental payers (including Medicaid), healthcare providers, drug manufacturers, and patients.

Acknowledgments

The authors thank John R. Ferguson for editorial assistance in preparing this manuscript.

Author Affiliations: Center for Liver Diseases, Department of Medicine, Inova Fairfax Hospital (ZY), Falls Church, VA; Betty and Guy Beatty Center for Integrated Research, Inova Health System (ZY), Falls Church, VA; Henry Ford Hospital (SCG), Detroit, MI; Stanford University School of Medicine (AA), Stanford, CA; Icahn School of Medicine at Mount Sinai (DD), New York, NY; University of California—Los Angeles (SS), Los Angeles, CA; Maple Health Group, LLC (RB), New York, NY.

Source of Funding: This study was funded by Gilead Sciences, Inc.

Author Disclosures: Dr Younossi is a consultant for Gilead, Abbvie, and Bristol-Myers Squibb (BMS), and has also received honoraria from each. Dr Ahmed has served as a consultant for Gilead, Abbvie, and Janssen, and has received a grant from Gilead. Dr Dieterich has been a consultant for and received honoraria and lecture fees for speaking from Gilead, BMS, Abbvie, Merck, and Janssen. Dr Saab has served as a consultant for Abbvie, BMS, Gilead, and Merck; and has received lecture fees for speaking at the invitation of a commercial sponsor and honoraria from Abbvie, BMS, Gilead, and Merck. Dr Gordon has served on ad-hoc advisory boards for Abbvie Pharmaceuticals, BMS, Intercept, CVS Caremark, Gilead Pharmaceuticals, and Merck; and has received grants/research support from Abbvie Pharmaceuticals, BMS, Conatus, CymaBay, Exalenz, Gilead Pharmaceuticals, Intercept Pharmaceuticals, and Merck. Dr Beckerman reports no relationship or financial interest with any entity that would pose a conflict of interest with the subject matter of this article.

Authorship Information: Concept and design (RB, SCG, SS); acquisition of data (RB); analysis and interpretation of data (RB, SCG, SS, ZY); drafting of the manuscript (AA, DD, RB, SS, ZY); critical revision of the manuscript for important intellectual content (AA, RB, SCG, SS, ZY); statistical analysis (RB); obtaining funding (RB); administrative, technical, or logistic support (RB); and supervision (ZY).

Address Correspondence to: Zobair Younossi, MD, Beatty Center for Integrated Research, 3300 Gallows Rd, Falls Church, VA 22042. E-mail: zobair.younossi@inova.org.

REFERENCES

1. Edlin BR, Eckhardt BJ, Shu MA, Holmberg SD, Swan T. Toward a more accurate estimate of the prevalence of hepatitis C in the United States. Hepatology. 2015;62(5):1353-1363. doi: 10.1002/hep.27978.

2. Cacoub P, Gragnani L, Comarmond C, Zignego AL. Extrahepatic manifestations of chronic hepatitis C virus infection. Dig Liver Dis. 2014;46(suppl 5):S165-S173. doi: 10.1016/j.dld.2014.10.005.

3. Younossi Z, Henry L. Systematic review: patient-reported outcomes in chronic hepatitis C--the impact of liver disease and new treatment regimens. Aliment Pharmacol Ther. 2015;41(6):497-520. doi: 10.1111/apt.13090.

4. Menzin J, White LA, Nichols C, Deniz B. The economic burden of advanced liver disease among patients with hepatitis C virus: a large state Medicaid perspective. BMC Health Serv Res. 2012;12:459. doi: 10.1186/1472-6963-12-459.

5. Manne V, Sassi K, Allen R, Saab S. Hepatitis C and work impairment: a review of current literature. J Clin Gastroenterol. 2014;48(7):595-599. doi: 10.1097/MCG.0000000000000080.

6. Heim MH. 25 years of interferon-based treatment of chronic hepatitis C: an epoch coming to an end. Nat Rev Immunol. 2013;13(7):535-542. doi: 10.1038/nri3463.

7. Smith BD, Yartel AK, Krauskopf K, et al. Hepatitis C virus antibody positivity and predictors among previously undiagnosed adult primary care outpatients: cross-sectional analysis of a multisite retrospective cohort study. Clin Infect Dis. 2015;60(8):1145-1152. doi: 10.1093/cid/civ002.

8. Assoumou SA, Huang W, Horsburgh CR Jr, Drainoni ML, Linas BP. Relationship between hepatitis C clinical testing site and linkage to care. Open Forum Infect Dis. 2014;1(1):ofu009. doi: 10.1093/ofid/ofu009.

9. Reau N. HCV testing and linkage to care: expanding access. Clin Liver Dis. 2014;4(2):31-34. doi/10.1002/cld.376.

10. Falck-Ytter Y, Kale H, Mullen KD, Sarbah SA, Sorescu L, McCullough AJ. Surprisingly small effect of antiviral treatment in patients with hepatitis C. Ann Intern Med. 2002;136(4):288-292.

11. Stepanova M, Younossi ZM. Interferon-free regimens for chronic hepatitis c: barriers due to treatment candidacy and insurance coverage. Dig Dis Sci. 2015;60(11):3248-3251. doi: 10.1007/s10620-015-3709-6.

12. Wise M, Bialek S, Finelli L, Bell BP, Sorvillo F. Changing trends in hepatitis C-related mortality in the United States, 1995-2004. Hepatology. 2008;47(4):1128-1135. doi: 10.1002/hep.22165.

13. Xu F, Tong X, Leidner AJ. Hospitalizations and costs associated with hepatitis C and advanced liver disease continue to increase. Health Aff (Millwood). 2014;33(10):1728-1735. doi: 10.1377/hlthaff.2014.0096.

14. Kanwal F, Hoang T, Kramer JR, et al. Increasing prevalence of HCC and cirrhosis in patients with chronic hepatitis C virus infection. Gastroenterology. 2011;140(4):1182-1188. doi: 10.1053/j.gastro.2010.12.032.

15. Ferro C, Blumen HE, Johnson RL. The burden of hepatitis C virus disease in commercial and managed Medicaid populations. Milliman website. www.us.milliman.com/insight/2015/The-burden-of-hepatitis-C-virus-disease-in-commercial-and-managed-Medicaid-populations/. Published September 24, 2015. Accessed January 24, 2016.

16. Younossi ZM, Boparai N, Price LL, Kiwi ML, McCormick M, Guyatt G. Health-related quality of life in chronic liver disease: the impact of type and severity of disease. Am J Gastroenterol. 2001;96(7):2199-2205.

17. Oliva-Moreno J, Peña-Longobardo LM, Alonso S, et al. Labour productivity losses caused by premature death associated with hepatitis C in Spain. Eur J Gastroenterol Hepatol. 2015;27(6):631-637. doi: 10.1097/MEG.0000000000000336.

18. El Khoury AC, Wallace C, Klimack WK, Razavi H. Economic burden of hepatitis C-associated diseases: Europe, Asia Pacific, and the Americas. J Med Econ. 2012;15(5):887-896. doi: 10.3111/13696998.2012.681332.

19. Leidner AJ, Chesson HW, Xu F, Ward JW, Spradling PR, Holmberg SD. Cost-effectiveness of hepatitis C treatment for patients in early stages of liver disease. Hepatology. 2015;61(6):1860-1869. doi: 10.1002/hep.27736.

20. Martin NK, Vickerman P, Dore GJ, et al. Prioritization of HCV treatment in the direct-acting antiviral era: an economic evaluation. J Hepatol. 2016;61(1):17-25. doi: 10.1016/j.jhep.2016.02.007.

21. Younossi ZM, Park H, Saab S, Ahmed A, Dieterich D, Gordon SC. Cost-effectiveness of all-oral ledipasvir/sofosbuvir regimens in patients with chronic hepatitis C virus genotype 1 infection. Aliment Pharmacol Ther. 2015;41(6):544-563. doi: 10.1111/apt.13081.

22. Younossi Z, Bacon B, Dieterich D, et al. Evaluation of access to care in patients prescribed sofosbuvir-containing regimens; data from the TRIO network [abstract 1033]. Presented at: Digestive Disease Week; May 17-19, 2015; Washington, DC.

23. Barua S, Greenwald R, Grebely J, Dore GJ, Swan T, Taylor LE. Restrictions for Medicaid reimbursement of sofosbuvir for the treatment of hepatitis C virus infection in the United States. Ann Intern Med. 2015;163(3):215-223. doi: 10.7326/M15-0406.

24. Kim WR, Reau N, Shiffman ML, Cournand H, Hassanein TI. Policy Implications of Disproportionate Burden of Hepatitis C Care for Medicaid Compared to Commercial Payers [poster no. 1813]. Presented at: American Association for the Study of Liver Diseases 2015; November 13-17, 2015; San Francisco, CA.

25. Population estimate 2010. United States Census Bureau website. https://factfinder.census.gov/faces/nav/jsf/pages/community_facts.xhtml. Accessed January 12, 2017.

26. Nainan OV, Alter MJ, Kruszon-Moran D, et al. Hepatitis C virus genotypes and viral concentrations in participants of a general population survey in the United States. Gastroenterology. 2006;131(2):478-484.

27. Kowdley KV, Gordon SC, Reddy KR, et al; ION-3 Investigators. Ledipasvir and sofosbuvir for 8 or 12 weeks for chronic HCV without cirrhosis. N Engl J Med. 2014;370(20):1879-1888. doi: 10.1056/NEJMoa1402355.

28. Kowdley KV, An D, Pang PS, Wyles D. Analysis of subgroup differences in the ION-3 trial of ledipasvir-sofosbuvir in chronic hepatitis C infection. Open Forum Infect Dis. 2015;2(2):ofv056. doi: 10.1093/ofid/ofv056.

29. Denniston MM, Jiles RB, Drobeniuc J, et al. Chronic hepatitis C virus infection in the United States, National Health and Nutrition Examination Survey 2003 to 2010. Ann Intern Med. 2014;160(5):293-300. doi: 10.7326/M13-1133.

30. Curry M, Bacon B, Dieterich D, et al. Effectiveness of 8- or 12-week LDV/SOF in treatment-naïve patients with non-cirrhotic, genotype 1 hepatitis C: real-world experience from the TRIO Network [abstract 1046]. Presented at: 66th Annual Meeting of the American Association of Liver Diseases 2015; November 13-17, 2015; San Francisco, CA.

31. Terrault N, Monto A, Stinchon MR, Rusie E, Moreo K. New therapies, evidence, and guidance in hepatitis C management: expert practices and insights from an educational symposium at the AMCP 27th Annual Meeting Expo. J Manag Care Spec Pharm. 2015;21(9):S1-S14.

32. Silverman E. What the ‘shocking’ Gilead discounts on its hepatitis C drugs will mean. Wall Street Journal website. http://blogs.wsj.com/pharmalot/2015/02/04/what-the-shocking-gilead-discounts-on-its-hepatitis-c-drugs-will-mean/. Published February 4, 2015. Accessed January 12, 2017.

33. Medicare-to-Medicaid Fee Index. Kaiser Family Foundation website. http://kff.org/medicaid/state-indicator/medicaid-to-medicare-fee-index/. Accessed September 1, 2015.

34. Liao JM, Fischer MA. Early patterns of sofosbuvir utilization by state Medicaid programs. N Engl J Med. 2015;373(13):1279-1281. doi: 10.1056/NEJMc1506108.

35. Kau A, Vermehren J, Sarrazin C. Treatment predictors of a sustained virologic response in hepatitis B and C. J Hepatol. 2008;49(4):634-651. doi: 10.1016/j.jhep.2008.07.013.

36. Younossi ZM, Stepanova M, Afdhal N, et al. Improvement of health-related quality of life and work productivity in chronic hepatitis C patients with early and advanced fibrosis treated with ledipasvir and sofosbuvir. J Hepatol. 2015;63(2):337-345. doi: 10.1016/j.jhep.2015.03.014.

37. Younossi ZM, Kanwal F, Saab S, et al. The impact of hepatitis C burden: an evidence-based approach. Aliment Pharmacol Ther. 2014;39(5):518-531. doi: 10.1111/apt.12625.

38. Terrault NZ, Di Bisceglie AM, Lim JK, et al. Treatment outcomes with 8, 12 and 24 week regimens of ledipasvir/sofosbuvir for the treatment of hepatitis C infection: analysis of a multicenter prospective, observational study. Presented at: 66th Annual Meeting of the American Association of Liver Diseases 2015; November 13-17, 2015; San Francisco, CA.