The Medicare Hospital Readmission Reduction Program

Aiming for Fewer Hospital U-turns: The Medicare Hospital Readmission Reduction Program

Sep 30, 2016 | Cristina Boccuti and Giselle Casillas

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For Medicare patients, hospitalizations can be stressful; even more so when they result in subsequent readmissions. While many readmissions are unavoidable, researchers have found wide variation in hospitals’ readmission rates, suggesting that patients admitted to certain hospitals are more likely to experience readmissions compared to other hospitals. A number of studies show that hospitals can engage in several activities to lower their rate of readmissions, such as clarifying patient discharge instructions, coordinating with post-acute care providers and patients’ primary care physicians, and reducing medical complications during patients’ initial hospital stays.

Medicare—through Congressional direction and Administration initiatives—has started implementing incentives to reduce hospital readmissions. One example, and the focus of this Issue Brief, is the Hospital Readmission Reduction Program (HRRP), which financially penalizes hospitals with relatively higher rates of Medicare readmissions. This Issue Brief, updated with new estimates for 2017, describes the HRRP, analyzes the program’s impact on Medicare patients and hospitals, examines the decline in national readmission rates, and discusses several implementation issues that policymakers have raised.

Main Findings


Generally speaking, a hospital readmission occurs when a patient is admitted to a hospital within a specified time period after being discharged from an earlier (initial) hospitalization. For Medicare, this time period is defined as 30 days, and includes hospital readmissions to any hospital, not just the hospital at which the patient was originally hospitalized. Medicare uses an “all-cause” definition of readmission, meaning that hospital stays within 30 days of a discharge from an initial hospitalization are considered readmissions, regardless of the reason for the readmission. This all-cause definition is used in calculating both the national average readmission rate and each hospital’s specific readmission rate. Starting in 2014, CMS began making an exception for planned hospitalizations (such as a scheduled coronary angioplasty) within the 30-day window; these are no longer counted as readmissions.

The current focus in the HRRP is on readmissions occurring after initial hospitalizations for selected conditions—namely, heart attack, heart failure, pneumonia, chronic obstructive pulmonary disease (COPD), elective hip or knee replacement, and coronary artery bypass graft (CABG). CMS also collects hospitals’ overall readmission rates (regardless of initial diagnoses), but these overall rates are not currently used in the HRRP to calculate readmissions penalties.


The HRRP was established by a provision in the Affordable Care Act (ACA) requiring Medicare to reduce payments to hospitals with relatively high readmission rates for patients in traditional Medicare. Starting in 2013 as a permanent component of Medicare’s inpatient hospital payment system (i.e., not a temporary demonstration project), the HRRP applies to most acute care hospitals. Exempt hospitals include psychiatric, rehabilitation, long term care, children’s, cancer, and critical access hospitals, as well as all hospitals in Maryland.4

Under the HRRP, hospitals with readmission rates that exceed the national average are penalized by a reduction in payments across all of their Medicare admissions—not just those which resulted in readmissions. Before comparing a hospital’s readmission rate to the national average, CMS adjusts for certain demographic characteristics of both the patients being readmitted and each hospital’s patient population (such as age and illness severity). After these adjustments, CMS calculates a rate of “excess” readmissions, which links directly to the hospital’s readmission penalty—the greater each hospital’s rate of excess readmissions, the higher its penalty. Each year, CMS releases each hospital’s penalty for the upcoming year in the Federal Register and posts this information on its Medicare website.

For the first year, fiscal year 2013, the maximum penalty was 1 percent of the hospital’s base Medicare inpatient payments, increasing to 2 percent for 2014, and was fully phased-in at 3 percent starting in 2015 (Table 1).6When calculating each hospital’s readmission rate, CMS uses three full years of hospital data. Accordingly, the upcoming 2017 penalties were based on hospital readmissions that occurred from July 2012 through June 2015.

Table 1: The first five years of the Hospital Readmission Reduction Program
Year penalties applied FY 2013 FY 2014 FY 2015 FY 2016 FY 2017
Performance (measurement) period June 2008-July 2011 June 2009-July 2012 June 2010-July 2013 June 2011-July 2014 June 2012-July 2015
Diagnoses of initial hospitalization Heart attack
Heart failure
Heart attack
Heart failure
Heart attack
Heart failure
Hip or knee replacement
Heart attack
Heart failure
Hip or knee replacement
Heart attack
Heart failure
Pneumonia (expanded)*
Hip or knee replacementCABG
Penalties: Percentage reduction in base payments on all Medicare inpatient admissions
Maximum rate of penalty 1% 2% 3% 3% 3%
Average hospital payment adjustment
(among all hospitals)
-0.27% -0.25% -0.49% -0.48% -0.58%
Average hospital penalty
(among penalized hospitals only)
-0.42% -0.38% -0.63% -0.61% -0.74%
Percent of hospitals penalized 64% 66% 78% 78% 79%
Percent of hospitals at max penalty 8% 0.6% 1.2% 1.1% 1.8%
CMS estimate of total penalties $290 million $227 million $428 million $420 million $528 million
NOTES: *Additional types of pneumonia diagnoses added for 2017. Penalties are applied to each hospital in the year shown, based on performance during the preceding 3-year measurement period. Penalties assessed as reductions in base payments on all Medicare inpatient admissions, and do not apply to added payment adjustments, such as graduate medical education payments. Analysis excludes hospitals not subject to HRRP, such as Maryland hospitals and other hospitals not paid under the Medicare Hospital Inpatient Prospective Payment System, such as psychiatric hospitals. COPD: Chronic obstructive pulmonary disease. Estimates of total penalties reflect CMS’s published corrections for 2013 and 2014. CABG: coronary artery bypass grafting. FY: fiscal year.
SOURCE: Kaiser Family Foundation analysis of CMS Final Rules and Impact files for the Hospital Inpatient Prospective Payment System.

For penalties levied in 2013 and 2014, CMS focused on readmissions after initial hospitalizations for three selected conditions: heart attack, heart failure, and pneumonia. For penalties levied in 2015, CMS added COPD, and elective hip or knee replacement.  For 2017 penalties, CMS expanded the types of pneumonia cases that were assessed and calculated readmission rates following CABG surgery.


Across all hospitals, the average 2017 penalty will be a 0.58-percent reduction in base Medicare payments for all inpatient admissions.  Among only penalized hospitals, the average fine will be a 0.74-percent reduction in Medicare inpatient payments, a 13-percentage point increase from the prior year (Table 1). With these increases, CMS estimates that total penalties across all hospitals will total $528 million, $108 million more than in 2016. The share of hospitals receiving a penalty has remained relatively flat (78 to 79 percent) over the past three years.

The increase in average and total penalties for 2017 is due mostly to a larger number of medical conditions included in the calculations for the 2017 readmission penalty.  Specifically, as described above, CMS added CABG and expanded the cohort of pneumonia diagnoses to the list of initial diagnoses eligible for assessing hospital performance on readmissions.  A similar increase in average penalties occurred in 2015 when CMS added two diagnoses (COPD and hip or knee replacement) to the list of initial diagnoses being assessed for readmission, which was found to play a larger role in penalty increases than phasing in the maximum penalty.

A second reason that average penalties have not fallen stems from the statutory requirement that penalty assessments be based on average hospital performance, rather than on fixed targets.  In other words, CMS assesses hospital penalties based on a curve, resulting in a certain percentage of hospitals always be penalized, regardless of improvements in national readmission rates.  Advantages and disadvantages of changing this formula are discussed later in this brief.


For a patient perspective, our analysis finds that for 2017, most beneficiaries will stay in hospitals with low to no penalties.  Specifically, we estimate that 78 percent of beneficiary stays in 2017 will be in hospitals that scored well enough during their previous measurement period to receive either no penalty or penalties equaling less than 1 percent of the hospital’s Medicare inpatient payments. (Figure 1).  Conversely, 22 percent of beneficiary stays will be in hospitals that will receive fines greater than 1 percent of their Medicare payments for inpatient admissions. About 1 percent of Medicare admissions will occur in hospitals that will receive the maximum penalty, a 3-percent reduction in Medicare payments across all inpatient admissions.

Figure 1: Most Medicare patient stays (78%) are in hospitals with either no penalty or penalties equal to less than 1% of their Medicare inpatient payments

Figure 1: Most Medicare patient stays (78%) are in hospitals with either no penalty or penalties equal to less than 1% of their Medicare inpatient payments


Analysis of the variation in penalties by type of hospital suggests that Medicare beneficiaries who go to certain types of hospitals—namely major teaching hospitals and hospitals with relatively greater shares of low-income beneficiaries—are more likely to stay in penalized hospitals and hospitals with higher penalties (Table 2).  This finding is consistent with previous research.7 To some degree there is overlap among these two types of hospitals, as major teaching hospitals often serve as safety-net hospitals with higher proportions of low-income patients.  Across all years, hospitals with the smallest share of low-income beneficiaries (quartile 1) are the least likely to be assessed any penalty at all.  For 2017, 66 percent of hospitals in the lowest quartile of low-income patients (as determined by beneficiaries with Social Security Income) will be fined a readmission penalty compared with 86 percent among hospitals with the highest share of low-income beneficiaries.  Rural hospitals also have higher rates of being penalized and higher average penalties. Variations in penalty rates by hospital characteristics have persisted across all five years of the program, although differences were greater in the first year when the maximum penalty was only 1 percent (see Appendix Table for analysis of earlier years).

Table 2: Variation in penalties by hospital characteristics, 2017
Hospital type % of hospitals % of Medicare patient admissions Average hospital penalty
% reduction in
base payments on all Medicare inpatient admissions
% of hospitals with any penalty % of hospitals at maximum penalty
All 100% 100% -0.58% 79% 1.8%
Urban 75% 89% -0.57% 80% 1.5%
Rural 25% 11% -0.64% 77% 2.7%
Teaching status
Major teaching 9% 18% -0.66% 93% 1.0%
Other teaching 22% 37% -0.57% 84% 1.1%
Nonteaching 68% 45% -0.58% 75% 2.2%
<100 beds 39% 10% -0.50% 65% 2.6%
100-299 beds 42% 42% -0.67% 87% 1.6%
300+ beds 20% 49% -0.57% 90% 0.6%
Proportion of patients who are low-income, Medicare
Quartile 1 (Lowest) 24% 20% -0.47% 66% 2.3%
Quartile 2 25% 30% -0.56% 81% 1.5%
Quartile 3 25% 30% -0.64% 86% 1.1%
Quartile 4 (Highest) 25% 20% -0.69% 86% 2.5%
NOTES: The low-income Medicare patient proportion is derived from hospital ratios of Supplemental Security Income (SSI) patient days, with the 4th quartile having the highest ratio of low-income patient days. The percent of hospitals in each group is for 2016. The percent of patient admissions is from based on the March 2015 update of the FY 2014 MedPAR. Analysis excludes hospitals not subject to HRRP because they are not paid under the Medicare Hospital Inpatient Prospective Payment System (e.g., Maryland hospitals, psychiatric hospitals). Penalties assessed as reductions in base payments on all Medicare inpatient admissions, and do not apply to added payment adjustments, such as graduate medical education payments.
SOURCE: Kaiser Family Foundation analysis of CMS Final Rules and Impact Files for the Hospital IPPS; CMS SSI calculations are from 2014 claims run out.

CMS has been posting individual hospital readmission rates on its Hospital Compare website, in addition to other measures of quality and patient satisfaction, since 2009. Designed for use by Medicare consumers as well as researchers, this website also provides comparisons of each hospital’s Medicare readmission performance to the national average by indicating whether the hospital is “better/worse/no different” than the U.S. National rate. In addition to readmissions following hospitalizations for selected diagnoses, the Hospital Compare website started reporting each hospital’s overall Medicare readmission rates.

Analysis of this database shows that 2012 marks the first measurable declines in readmissions (Figure 2).  Specifically, when the three-year moving average of hospital readmission rates began including data from 2012, the rates fell across all three diagnosis categories, and have continued through subsequent measurement periods. These notable drops started after Congress enacted the HRRP in the ACA, suggesting that hospitals may have initiated new interventions to lower their readmission rates during the measurement period leading up to the fines, which started in 2013. Additionally, other clinician activities outside the hospitals may have contributed to the decline in readmissions. With the decline in the rate of readmissions, the Department of Health and Human Services estimates 565,000 fewer Medicare patient readmissions from April 2010 through May 2015.

Figure 2: National Medicare Readmission Rates Started to Fall in 2012

Figure 2: National Medicare Readmission Rates Started to Fall in 2012

Despite the reduction in readmission rates, average HRRP penalties have not declined, as shown earlier in Table 1. A main reason that declines in national readmission rates do not necessarily translate to lower fines is that penalty calculations are based on average hospital performance, rather than on fixed targets, as required by law. In other words, CMS must assess hospital penalties based on a curve, resulting in a certain percentage of hospitals always being penalized, regardless of improvements in national readmission rates.  Advantages and disadvantages of changing this formula are discussed below.


Concerns raised by researchers and hospital representatives have prompted policymakers to consider refinements to the implementation of the HRRP and look for ways to engage other health care providers and patients. Some of the refinements under discussion include changes in the way hospital measures are risk-adjusted, setting hospital performance targets, and engaging other providers.


Our analysis finds that most Medicare patient admissions (78%) for 2017 will be in hospitals receiving either no readmission penalty or penalties of less than 1 percent. Given the stress and problems that patients experience when readmitted to the hospital, it may be reassuring that beneficiaries’ stays are typically in hospitals with relatively lower readmission rates.  While hospitals at the upper end of the penalty range account for a considerably smaller proportion of beneficiary inpatient stays, to the extent that higher readmission rates signal concerns about care quality and discharge planning, patients going to higher-penalty hospitals may be at greater risk for related problems.  Further study about other possible differences between relatively high- and low-penalty hospitals may be helpful, such as in their discharge planning activities or their overall patient complexity, particularly in teaching hospitals and hospitals with higher proportions of low-income Medicare patients.

Although CMS makes adjustments for clinical risk factors (including patients’ age, gender, and comorbidities), it does not adjust for socioeconomic factors, which often play a role in access to home and community support services aiding a patient’s recovery after hospitalizations. For example, lower-income communities and families may have limited resources for reliable transportation to take patients to follow-up medical appointments, assistance with patient mobility and daily living needs during recovery, and access to foods that meet patients’ special dietary needs.  Further examination of ways to address patient and community needs in lower income areas may offer insights into ways to lower hospital readmissions among patients in hospitals with higher shares of low-income patients.

Policymakers, including members of Congress have expressed interest in issues related to the variation in penalties across hospitals, and have introduced legislation in both the House and Senate to adjust the HRRP penalty calculations for socioeconomic factors.  Additionally, further research could examine the role of other clinicians in these hospitals’ communities, including ambulatory and post-acute care facilities and professionals and other coordinating organizations.

Our research also shows that previously flat readmission rates for traditional Medicare started to decline in 2012 and have continued along that path in subsequent years. This timing suggests that hospitals may have started to implement strategies to lower their readmissions in response to the enactment of the HRRP, with the understanding that the financial penalties (starting in 2013) would be based on performance in prior years.  Further, because the declines are seen for multiple conditions, multipronged and system-based efforts to reduce readmissions are likely, rather than limited improvements in selected clinical treatments.14  Moreover, the fact that the lower readmission rates have been sustained across several years suggests that system-wide improvement have played a role.  Simultaneously, other providers in the community may have started to focus on ways to lower readmissions among their patients, thus contributing to the continued decline in national readmission rates.

The overall effect of the HRRP on Medicare beneficiaries is rather indirect.  To the extent that the financial penalties encourage hospitals to implement activities designed to improve care quality and lower their rate of preventable readmissions, the penalty program could be beneficial to Medicare patients and the Medicare program.  Alternatively, some have noted that reducing financial resources to lower-performing hospitals could have a negative impact on their delivery of patient care.  Regarding beneficiaries’ out-of-pocket expenses, a hospital’s penalty status has no direct effect on beneficiaries’ cost sharing during inpatient stays. For readmissions in particular, the inpatient hospital deductible ($1,288 in 2016) is waived, but beneficiaries do face other out-of-pocket liabilities—mostly in the form of coinsurance for separately billed physician services received during their stay—as they would in all inpatient stays.15


With the enactment of the HRRP in the ACA, the aim to reduce preventable hospital readmissions has gained traction among providers and policymakers.  In fact, the HRRP is featured as part of the Administration’s goals to tie increasing shares of traditional Medicare payments to quality or value in the coming years.  Moreover, key programs, such as Accountable Care Organizations (ACOs), bundled-payment initiatives, medical home programs, and the Independence at Home demonstration, include provider incentives to lower hospital admission and readmission rates, either directly or indirectly.  For a description of these models and a summary of the available evidence on spending and quality outcomes, see Payment and Delivery System Reform in Medicare: A Primer on Medical Homes, Accountable Care Organizations, and Bundled Payments.  Additionally, the Community-based Care Transitions Program, also enacted by the ACA, is designed to assess ways that community-based organizations (such as local aging services agencies) might partner with hospitals to improve patients’ transitions to other settings, such as skilled nursing facilities or the patients’ home.16  Also, in traditional Medicare, CMS has recently started allowing physicians to bill Medicare for “transitional care management” after a beneficiary’s discharge from a hospital or other health care facility, in an effort to reimburse physicians for follow-up activities that could reduce readmissions and other complications.

As more results become available from Medicare’s payment and delivery system reforms a key question continues to be whether and how care improves for Medicare patients with the greatest health care needs—often those who have been hospitalized one or more times during the year.  Reductions in hospital readmission may be a likely outcome on which to focus and may help policymakers identify which models to pursue more broadly.  A continuing decline in preventable readmission rates would help slow the growth in Medicare spending and may also signal improved care for patients during and after their hospitalizations.