Medicare Shared Savings Program: Public Reporting and Shared Savings Distributions

The American Journal of Managed CareAugust 2015
Volume 21
Issue 8

Analysis of publicly reported organizational characteristics, shared savings distribution plans, and early financial success of accountable care organizations in the Medicare Shared Savings Program.


Objectives: To determine if Medicare Shared Savings Program (MSSP) accountable care organizations (ACOs) are meeting public reporting requirements related to shared savings plans, to quantitate the composition of shared savings distribution plans, and to investigate whether early ACO success is associated with specific plan or ACO characteristics.

Study Design: Cross-sectional study.

Methods: ACO descriptive characteristics and distribution plan details were abstracted from official ACO websites for all 338 active MSSP ACOs launched through January 2014. Publicly available MSSP results from 2012 and 2013 start date ACOs were used to investigate associations with successful shared savings generation.

Results: Of current MSSP ACOs, 313 of 338 (93%) maintain a website, 284 of 338 (84%) provided at least a general statement about shared savings distributions, and 176 of 338 (52%) reported detailed allocation percentages to ACO participants. On average, ACOs reporting detailed allocations planned to give 63% (range = 0%-100%; SD = 26.3) to their primary care providers (PCPs), specialists, and/or hospitals, and 33% (range = 0%-100%; SD = 25.6) to infrastructure. ACOs including a hospital planned to give a larger average percentage to participating entities than those without (69% vs 58%; P = .01). ACOs planning to give >50% to their PCPs and specialists were more likely to have generated savings (P = .001), as were ACOs composed of >10 participating entities (P = .004).

Conclusions: Just over one-half of MSSP ACOs report detailed shared savings distribution plans online, and these plans vary widely. There appears to be no single shared savings distribution plan determinate of ACO success. Continued investigation of predictors for generating savings is needed to inform future shared savings models.

Am J Manag Care. 2015;21(8):546-553

Take-Away Points

Analysis of publicly reported organizational characteristics, shared savings distribution plans, and early financial success of accountable care organizations (ACOs) in the Medicare Shared Savings Program (MSSP) demonstrated that:

  • Most ACOs are meeting their public reporting requirements related to shared savings distribution plans.
  • ACOs vary widely in how they plan to distribute shared savings.
  • In a preliminary investigation using early MSSP ACO results, ACOs that planned to allocate the majority of shared savings to their primary care providers and specialists or were composed of more individual participating entities (ie, clinicians, clinician group practices, hospital, and/or other participating providers) were more likely to have generated savings.

More than 440 Medicare accountable care organizations (ACOs) have been established nationwide since the Affordable Care Act was passed in 2010.1,2 Medicare ACOs in the Medicare Shared Savings Program (MSSP) and Pioneer ACO programs voluntarily contract with Medicare to be responsible for the health outcomes and expenditures of a defined patient population. ACOs aim to promote higher-quality care and to reduce the growth of healthcare costs through improved care coordination, care management programs, information technology, and other interventions,3-5 and when ACOs succeed in these goals, they may share in the cost savings with Medicare. These potential “shared savings” are 1 important driver for ACO formation.6

Early results are modest.7 Of MSSP ACOs that initiated operations in 2012 or 2013, 118 (54%) lowered expenditures compared with benchmark projections. In total, these ACOs generated $383 million in net savings for Medicare during their first performance year, with 52 ACOs earning shared savings payments of more than $315 million.8 ACOs (and ACO-like models) continue to form, including in the commercial insurance sector and in state-based Medicaid programs.9-11 Nevertheless, significant questions remain about the financial viability of the ACO model.12,13

Specific regulatory requirements governing the MSSP provide an opportunity to examine important questions about what ACOs plan to do with their shared savings (ie, their “shared savings distribution plans”). The MSSP requires ACOs to initially submit their shared savings plan in their application to the MSSP program, and later to publicly report their distribution plans on required ACO websites.14 Guidance suggests that MSSP ACOs should also describe the percentage of total shared savings that will be allocated to infrastructure, primary care providers (PCPs), specialists, and hospitals in the ACO. Importantly, Medicare ACOs have flexibility in how they use shared savings, as long as use is consistent with the ACO program mission15; shared savings payments to beneficiaries, however, are not permitted.

Whether and how ACOs are meeting these policy requirements is unknown but of significant interest to all stakeholders,16,17 and patients may be interested in whether savings benefit them directly (eg, via new care programs and interventions) or indirectly (eg, via incentives to clinicians and hospitals to improve care quality).18 Although savings distribution to ACO PCPs and specialists is considered a key component of ACO success, how much and on what basis ACOs will do so is unspecified and unknown.19 Finally, ACO leaders and policy makers may be interested in what ACOs are doing regarding shared savings, because savings distribution plans likely reflect ACO strategic planning and what ACOs believe will help to incentivize desired care patterns.20

The objective of this study was to begin describing the landscape of how MSSP ACOs publicly report and plan to use their shared savings. We also conducted a preliminary investigation on whether certain ACO organizational characteristics appear to be associated with certain intended uses of shared savings. Finally, using early results from the MSSP, we examined whether certain organizational characteristics or shared savings distribution plan design elements are associated with ACO financial success.


Study Sample

We examined the official ACO websites for all 338 active MSSP ACOs initiated in April and July 2012, January 2013, and January 2014. At the time of our study, 5 ACOs had been approved to participate, but were not included in the CMS database of active ACOs (these were not included in this analysis).21 Website addresses were found using information available on the CMS website,21 but because the CMS website did not include website addresses for the January 2014 start date, we located these on the Internet. Among 338 ACOs, 322 had an available official website for review; all 16 ACOs without a website locatable by routine search methods were in the January 2014 group. Pioneer ACOs were excluded from analysis.

Data Abstraction Strategy

eAppendix Table

We designed a data abstraction strategy based upon information expected from MSSP public disclosure requirements14 and our study objectives, such as key ACO descriptive characteristics and composition, public reporting, and proposed shared savings distribution plan features (eg, percentage of distribution to infrastructure). A data abstraction form covering these domains is not publicly available to our knowledge; therefore, we developed one to capture desired data. We piloted a draft form on a subset (n = 30) of ACOs from the July 2012 group, then met and revised the form into a final version (, available at This version was used to collect data on all MSSP ACOs from June 3 through July 23, 2014.

Some variables collected during data abstraction warrant explication. We hypothesized that organizational complexity might affect shared savings plan characteristics or ACO success, because larger, more complex organizations may complicate how an ACO forms and operates. As a proxy of complexity, we collected data on the number of individual entities (ie, clinicians, clinician group practices, hospital, and/or other participating providers) participating in each ACO. We refer to this as the number of “participating entities” in each ACO. To illustrate, by our definition, an integrated health system that forms an ACO within its existing organizational structure has 1 participating entity, whereas an ACO that forms from a private practitioner, a group practice, a multi-specialty group, and a hospital—all of whom were previously unaffiliated as de-fined by ACO rules—would have 4 participating entities. Our use of participating entity is generally consistent with the CMS regulatory definition of an ACO participant.15

We also hypothesized that ACO composition might affect shared savings plan characteristics or success. Although ACO regulations refer to ACO “providers,”15 we identified whether an ACO included hospitals, PCPs, and specialists from information provided on official ACO websites. Whether an individual or group practice in an ACO is primary care or specialty may not be evident by name alone; therefore, we independently confirmed these practices in all cases by reviewing their websites. Moreover, because an ACO composed of a single participating entity (such as an integrated health system) might include multiple clinician groups (such as PCPs, specialists, and hospitals) relevant for shared savings plan characteristics, we elucidated the composition of these ACOs in similar fashion.

We also believed it was important to assess whether involvement of an external stakeholder might affect shared savings distribution plans. We defined “external stakeholder involvement” as present when an external stakeholder investor or company representative (not apparently otherwise affiliated with an ACO participating entity) was present on the governing board, or when the distribution plan included distributions to investors/shareholders.


Shared savings distribution plans were analyzed to determine if the composition of ACOs or the presence of external stakeholders were associated with differences in distribution plans. Once early MSSP financial performance results became available, we examined the 58 ACOs that generated savings to determine whether certain ACO characteristics or shared savings distribution plans were associated with success in generating shared savings.22

Study data were collected and managed using REDCap version 5,23 and statistical analysis was conducted using STATA version 11 (StataCorp, College Station, Texas). For comparisons of categorical variables, a χ2 test was used, and for comparisons of means, an unpaired t test was utilized.


General ACO Characteristics


We found that 313 (93%) of the MSSP ACOs have information regarding their composition publicly available on their website. Of these ACOs, 131 (42%) have more than 20 participating entities, while 42 (13%) are composed of only 1 (). More specifically, 140 (45%) included PCPs, specialists, and hospitals, 124 (40%) had PCPs and specialists, while 49 (16%) were composed entirely of primary care physicians. Those meeting our definition of involving external stakeholders numbered 67 (21%).

In rare instances, other types of clinicians were noted as being in the ACO. These included chiropractors, podiatrists, hospice, clinical laboratories, home care, pharmacies, dentists, physical therapists, optometrists, senior living centers, social services, and others. Among all ACOs, 49 (14%) included an academic medical center (AMC).

Public Reporting of Shared Savings Distribution Plans

Figure 1

We found that 285 (84%) ACOs publicly reported their shared savings distribution plan in various levels of detail. Of these 285, 81 (28%) had “to be determined” (TBD) listed under their savings distribution plan, 28 (10%) had general statements regarding how distributions would be allocated (eg, “to incentivize physicians and build infra-structure”) but without specific percentages, and 176 (62%) had detailed plans with specific percentages of the savings allocated to distinct categories ().

Shared Savings Distribution Plans

Among 176 MSSP ACOs with detailed plans available, 155 (88%) reported savings allotments for infrastructure (mean amount = 33%; range = 0%-100%; SD = 25.6; median = 25%); 166 (94%) reported savings allotments to their PCPs, specialists, and/or hospitals (mean amount = 63%; range = 0%-100%; SD = 26.3; median = 70%); and 29 (16%) reported savings apportionments for “other” reasons, such as investor allocations or payments to “strategic partners” or a “specialty advisory committee” (mean amount = 4%; range = 0%-50%; SD = 11.7; median = 0%) (Figure 2). Of note, 25 (14%) ACOs with detailed plans available reported planning to use shared savings to cover any expenses before apportioning savings to any participants (Figure 1).

In 166 cases, shared savings allocations were broken down into amounts for hospitals, PCPs, and specialists. Of the 77 ACOs including a hospital, 42 (55%) reported a specific percent designation to the hospital (mean amount = 9%; range = 0%-60%; SD = 15.0; median = 0%). Of the 166 ACOs reporting allocations to participating entities 137 (83%) designated a specific percent for clinicians, including PCPs and specialists (mean amount = 58%; range = 12.5%-100%; SD = 20.3; median = 59%). Of these 137, 95 (69%) reported specific allocations for PCPs (mean amount = 49%; range = 6.25%-100%; SD = 21.2; median = 50%) and specialists (mean amount = 11%; range = 0%-48%; SD = 12.5; median = 6%).

Finally, 46 plans (16% of plans with distribution plans online) explicitly referenced patients’ potential to benefit from shared savings. Furthermore, 16 (6%) referenced specific new programs that would be started to benefit patients and funded by shared savings. Examples included hiring case managers or launching educational sessions for patients.

Shared Savings Distribution Plans by ACO Type

Comparing the ACOs composed solely of PCPs to the ACOs with PCPs and specialists showed little difference in the distribution to each category (Figure 2). However, ACOs that included hospitals gave a larger average percentage to PCPs, specialists, and/or hospitals within the ACO compared with those without (69% vs 58%; P = .01).Compared with all active ACOs, ACOs with external stakeholders had a higher percentage of plans that were TBD (55% vs 18%; P <.001) and a lower percentage of plans with specific percentage allocations listed (36% vs 62%; P <.001). In addition, compared with the 152 ACOs without external stakeholders, ACOs with external stakeholders planned to give a smaller average percentage to PCPs, specialists, and/ or hospitals within the ACO (53% vs 65%; P = .04).

Shared Savings Distribution Plans and Financial Performance

No differences in the ability to generate savings were found between ACOs based on the inclusion of a hospital, AMC, or external stakeholder in the ACO.

We also calculated the proportion of ACOs that generated savings based on numbers of participating entities within an ACO (Figure 3). ACOs with 6 to 10 participating entities were the least likely to have generated savings (13%), while ACOs with more than 20 participating entities were most likely to have generated savings (37%).

No association was found between the percentage of shared savings allocated to PCPs, specialists, and/ or hospitals within the ACO versus infrastructure and the ability to generate savings. However, we found that ACOs that planned to distribute greater than 50% of shared savings to PCPs and specialists were associated with a higher probability of generating savings compared with those that did not (39% vs 22%; P = .001). Similarly, we found that ACOs that planned to distribute greater than 60% of shared savings to PCPs were more likely to have generated savings compared with those that did not (53% vs 24%; P = .01).


Our study describes the landscape of MSSP ACO shared savings distribution plans with a focus on public reporting, plan details, and the association between ACO organizational or distribution plan characteristics and ACO early financial success in generating shared savings.

Most MSSP ACOs are meeting the basic public reporting guidelines related to their shared savings distribution plans, as set forth by CMS. Nearly 85% of all 338 ACOs included basic information about distribution plans; only about half, however, included planned percentage distributions to PCPs, specialists, and/or hospitals within the ACO. ACOs with external stakeholders were less likely than other ACOs to report such details.

There are several possible explanations for this finding. First, all of the ACOs without a website were in the January 2014 start date, and these ACOs might have created websites since the study was conducted mid-year, or the websites existed but were unable to be found with normal search functions. Second, since initial public reporting guidance was issued in 2012, CMS has issued updated guidance in September 2014 that explicitly clarifies that ACOs must adhere to the reporting format of CMS.14,24

From a broader perspective, reporting of discrete percentages (as opposed to not reporting them, or reporting TBD) may or may not be equivalent to transparency. The complexity, uncertainty, and dynamic nature of an ACO’s shared savings distribution plan pose challenges for static posting online. For example, an ACO may be unable to predict all operational costs or clinical program needs in advance of applying to CMS. For such an organization to post discrete percentages—when such percentages are almost certain to change&mdash;it could actually work against the ethical value of transparency. Because at present there is little evidence regarding how different ACO stakeholders (including their patients) perceive different ways of reporting shared savings, future research could investigate how (if at all) reporting affects perceptions, trust, and buy-in to the ACO.25

We found that MSSP ACOs vary widely in their infrastructure as well as in planned shared savings allocations toward their PCPs, specialists, and/or hospitals (Figure 2). Overall, these findings are consistent with the intent of CMS MSSP regulations, which give ACOs flexibility to determine distribution plans tailored to a particular ACO’s needs for meeting program goals

We also found several notable associations between ACO characteristics and distribution plans. First, ACOs that included a hospital planned to allocate a larger percentage of shared savings to PCPs, specialists, and/or hospitals within the ACO compared with ACOs without hospitals. This may be because hospitals have fewer infrastructure needs initially compared with nonhospital ACOs, but determining the exact reasons for this association requires further in-depth study.26-28 Second, ACOs involving external investors or organizations planned to give a smaller percentage of shared savings to the ACO’s PCPs, specialists, and/or hospitals. This could be for several reasons: some savings might need to be distributed to the investors, leaving a lesser share available for participating entities; or alternatively, ACOs with external investors may have other financial arrangements in lieu of shared savings.29

We found few associations between ACO organizational or distribution plan characteristics and ACO early financial success. In terms of organizational characteristics, our most notable finding was that ACOs with over 20 participating entities were most likely to have generated savings (Figure 3). Although not statistically significant (perhaps due to the low number of ACOs examined), there appeared to be a U-shaped relationship, whereby ACOs with 6 to 10 participating entities were least likely to have generated savings. The reasons for this may be complex. For ACOs with fewer participating entities, greater control over care delivery may make it easier to implement new programs and care patterns necessary for success. For larger ACOs, ACO participating entity number could be a proxy for ACO size (in terms of patient number or diversity) or for operational complexity in functioning in an aligned manner. This finding merits further in-depth investigation.

In terms of other ACO characteristics, we found that ACOs distributing the majority of their savings to PCPs and specialists were more likely to have generated savings in their first operational year. No association existed between the generation of savings and amounts allocated to specialists, but ACOs distributing over 60% of savings to PCPs were more likely to have generated savings.

While these findings are not necessarily causal, intuitively, a greater potential monetary reward for individual clinicians, if well advertised to the participating provider community, could help incentivize behavior change and generate buy-in to the overall goals of the ACO. It is possible that specific distribution thresholds may play a factor in altered perceptions of individual providers. For example, individual clinicians may not change their behavior in response to a 10% or 30% distribution, but once the allocation rises above a certain threshold, they may be more willing to change their behavior. While robust relationships have yet to be established, preliminary data suggest that in order to generate savings, ACOs should consider allocating significant percentages of savings to providers, specifically PCPs.


Our study had limitations. First, all data were based upon publicly available information at the time of our study. Data were not verified with the 338 ACOs examined, and shared savings plan characteristics may change over time. Second, as our results show, only 176 (52%) of the 338 ACOs publicly reported specific percentage distributions to PCPs, specialists, and/or hospitals within the ACO. Distribution plans without this detail may differ, limiting our ability to make generalizable or detailed claims about how ACOs are using shared savings. This, as well as heterogeneity in data reporting, also prevented us from conducting regression analyses; as more data emerge, these could be considered in the future.


By examining publicly reported shared savings distribution plans of MSSP ACOs, we have described for the first time the landscape of how MSSP ACOs report and plan to use their shared savings. Most ACOs are meeting CMS reporting guidelines, but many are not reporting detailed characteristics of their planned shared savings allocations. Allocations of those that do report, vary widely. We found that ACOs that planned to distribute a majority of their savings to providers were more likely to have generated savings, as were ACOs with larger (>10) numbers of participating entities. However, no 1 common path yet exists for ACOs in terms of shared savings uses. Our findings, while preliminary, generate important hypotheses for future research. As ACOs evolve, it will be critical to continue examining how different stakeholders perceive shared savings distribution plan reporting and whether certain distribution plan characteristics may be associated with ACO success or failure.Author Affiliations: Johns Hopkins University School of Medicine (JS), Baltimore, MD; Berman Institute of Bioethics and Division of General Internal Medicine, Johns Hopkins University (MD), Baltimore, MD; Department of Medicine (Cardiology) and Office of Johns Hopkins Physicians (Accountable Care), Johns Hopkins University (SAB), Baltimore, MD; and Johns Hopkins Medicine Alliance for Patients, LLC (SAB), Baltimore, MD.

Source of Funding: Dr DeCamp’s work on this manuscript was funded by grant 1K08HS023684 from the Agency for Healthcare Research and Quality.

Author Disclosures: Dr Berkowitz is the executive director for Johns Hopkins Medicine Alliance for Patients, LLC, the Johns Hopkins Medicine accountable care organization. The authors report 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 (JS, MD, SAB); acquisition of data (JS); analysis and interpretation of data (JS, MD, SAB); drafting of the manuscript (JS, MD); critical revision of the manuscript for important intellectual content (JS, SAB); statistical analysis (JS); and supervision (SAB).

Address correspondence to: Scott A. Berkowitz, MD, MBA, 733 North Broadway, Miller Research Building G46, Baltimore, MD 21205. E-mail:

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