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3M™ Potentially Preventable Readmissions (3M PPRs)

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Identify potentially preventable readmissions using powerful clinical grouping logic.

3M PPRs find opportunities for better discharge planning, care coordination and follow up.

The 3M™ Potentially Preventable Readmissions (PPR) methodology identifies inpatient readmissions that could have potentially been preventable according to clinically precise criteria. The software determines whether a readmission is clinically related to a prior admission based on the patient’s diagnosis and procedure codes associated with the prior admission and the reason for readmission.


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Why choose the 3M™ Potentially Preventable Readmissions (PPR) methodology?

  • Suitable for all populations

    Suitable for all populations

    3M PPRs were developed for use in all populations, including obstetrics and pediatrics, but they also cover all conditions. This approach stands in sharp contrast to the relatively narrow focus of the Centers for Medicare & Medicaid Services (CMS) readmission methodology.

  • Clincally defined risk adjustment

    Careful, clinically defined risk adjustment

    Readmissions are only defined as potentially preventable if there is a plausible clinical connection to the initial admission. Typically, only about two-thirds of readmissions defined in all-cause analyses are considered potentially preventable in the 3M PPR methodology.
    Comparisons across populations can be risk-adjusted to reflect differences in case mix across hospitals or other groupings.

  • Generate actionable information

    A categorical measurement that generates actionable information

    3M PPRs are a categorical model, which means that analysts can generate a spreadsheet with a list of PPRs by patient, diagnosis related group (DRG) and reason. Clinicians and managers can use these data to reduce readmissions and improve care.

  • Revisits to the emergency department

    New insights into revisits to the emergency department

    In 2019, 3M enhanced the 3M PPR methodology to also identify patients who return for emergency department (ED) care for a reason clinically related to an initial hospital admission, even if they are not readmitted as an inpatient. Such insight is not available from other methodologies.


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All about 3M PPRs

The 3M PPR methodology generates actionable insights that enable hospitals and payers to improve patient outcomes and reduce cost.

  • Definition

    A potentially preventable readmission (PPR) is a readmission within a specified time interval that is determined to be clinically related to a previous admission and potentially preventable. Similarly, a potentially preventable revisit to the emergency department (PPR ED) is an ED visit within a specified time window that is determined to be clinically related to an initial hospital admission and potentially preventable.

  • 3M PPRs are most often used by payers, government agencies, hospitals, hospital systems and researchers. Users typically conduct analyses of multi-hospital data sets to compare performance on a risk-adjusted basis and identify opportunities for improvement. The same is expected of the recently released PPR ED methodology.

  • Here are a few examples of the value the PPR and PPR ED methodologies can bring to customers.


    • Improving quality. Through concerted effort, Minnesota hospitals prevented more than 7,000 readmissions over a two-year period. Over 80 hospitals participated in a learning collaborative, using 3M PPRs to track progress and provide detailed quarterly reports to each hospital. Learn more.
    • Public reporting. The New York Department of Health reports risk-adjusted PPR rates for each hospital on its website.
    • Enabling insight. In an all-payer analysis in Rhode Island, 6.3 percent of inpatients experienced at least one potentially preventable readmission. PPR rates varied by category, from 1.1 percent for obstetrics to 12.6 percent for adult mental health and/or substance abuse conditions. Two-thirds of readmissions were to the same hospital, but that percentage also varied by category. Learn more.
    • Paying for outcomes. Texas Medicaid is one of several payers that measures PPRs and incentivizes reductions. Learn more.
    • Monitoring hospital and managed care performance. The Ohio Medicaid program uses 3M PPRs to monitor hospital and managed care plan performance by comparing the actual number of PPRs with the number that would be expected for a hospital or plan of the same case mix. Learn more.
  • 3M PPR and PPR ED grouping logic is the same for every user, although different organizations may use different versions. (The most recent version is recommended.) Each user makes its own decisions about appropriate uses. At this time, 3M does not offer software that replicates PPR and PPR ED reimbursement analysis used by specific payers.

  • 3M PPRs and PPR EDs are integrated with the other 3M patient classification methodologies.


    • 3M PPRs and PPR EDs are identified from claims grouped using the 3M™ All Patient Refined Diagnosis Related Groups (APR DRG) methodology. 3M APR DRGs are also used to risk adjust PPR and PPR ED rates across hospitals or other inpatient populations.
    • 3M PPRs, including PPR EDs, are one of the five 3M™ Potentially Preventable Event methodologies. The others are 3M™ Potentially Preventable Complications (PPCs), 3M™ Potentially Preventable Admissions (PPAs), 3M™ Potentially Preventable Emergency Department Visits (PPVs) and 3M™ Potentially Preventable Services (PPS). 3M PPVs are a population-based outcome measure that identifies ED visits that could potentially have been prevented with better care in the community. Unlike PPR EDs, 3M PPVs are not tied to a previous inpatient stay.
  • 3M PPRs and PPR EDs are available in the following 3M products:


    • 3M™ 360 Encompass™ System
    • 3M™ Performance Matrix Platform
    • 3M™ Coding and Reimbursement System
    • 3M™ Reimbursement Calculation Software
    • 3M™ Advanced CDI Transformation Program
    • 3M™ Clinical Documentation Improvement (CDI) System
    • 3M™ Core Grouping Software (CGS)
    • 3M™ Grouper Plus Content Services (GPCS)

    Available to licensees on the 3M Customer Support Website (covering both PPRs and PPR EDs)


    • PPR Methodology Overview
    • PPR Definitions Manual
    • PPR Norms File (Excel)
    • PPR Setup Guide
  • 3M experts are available to advise hospitals, health plans, government agencies, and other interested parties on how to obtain maximum value from the use of 3M PPRs and PPR EDs. For example, 3M consultants can help hospitals measure the incidence of potentially preventable readmissions and ED revisits, compare against benchmarks and help design programs for improvement. 3M consultants can also help payers and other organizations measure 3M PPRs and PPR EDs across hospitals, design pay-for-outcomes incentive programs and facilitate learning collaboratives to improve care.

  • Data requirements depend on whether the analysis is limited to inpatient readmissions or also includes revisits to the emergency department in which the patient is treated and released. A 3M PPR analysis can be done without ED data, but a PPR ED analysis requires both inpatient and ED data. In either case, all required data can be obtained from standard hospital claims, such as the UB-04 form or the X12N 837I electronic transaction. (The methodology is not designed to accept data from professional claims, such as may be submitted by urgent care clinics.) Individual records must be linked using consistent identifiers for both the patient and the hospital.

    Each inpatient stay is first assigned to a 3M™ All Patient Refined Diagnosis Related Group (APR DRG). Data fields that are particularly important include admission and discharge dates, discharge status, birth date, gender, diagnosis codes with present on admission (POA) indicators, and ICD-10-PCS procedure codes. Because there are several reasons why a patient may have more than one inpatient claim within a short timeframe, we recommend that the user evaluate the reliability of the discharge status data provided by hospitals (e.g., transfers, left against medical advice, still a patient).

    When the analysis also includes revisits to the emergency department, ED claims are also required. For PPR ED development, emergency department claims were defined by the combination of bill type 13X and revenue code 45X or 981. Users are responsible for selecting criteria appropriate to their own analysis. PPR ED analysis also requires the diagnosis codes that are routinely reported on outpatient hospital claims but does not require line-level detail such as procedure or revenue codes.

  • The challenge in readmission policy has always been to differentiate readmissions that were potentially avoidable from those that were not. In the early 2000s, 3M developed the 3M™ Potentially Preventable Readmissions (PPR) methodology. In 2007, the Medicare Payment Advisory Commission used the 3M methodology to report that 13.3 percent of Medicare inpatients had a PPR within 30 days, costing the Medicare program $12 billion in 2005. In 2008, 3M researchers published the PPR methodology in the Health Care Financing Review. This article has been cited 250 times as the 3M PPR methodology has spread across the U.S.

    As with the other 3M™ Potentially Preventable Event methodologies, three core concepts are essential:


    • First, we recognize that not all readmissions are potentially preventable.
    • Second, what matters is not the individual readmission but rather the overall rate of potentially preventable readmissions. Instead of an approach to quality of “this should never happen,” 3M uses a more realistic and meaningful approach of “this has happened too often.”
    • Third, any comparisons across hospitals, health plans, attending physicians or any other patient populations must be risk-adjusted.
    • The 3M PPR methodology starts by assigning every inpatient stay to a 3M™ All Patient Refined Diagnosis Related Group (APR DRG). The basic 3M PPR approach is to decide whether each combination of the initial admission 3M APR DRG and the readmission 3M APR DRG has a plausible clinical connection that indicates a potentially preventable readmission. That approach was supplemented by extensive clinical logic to add precision in identifying 3M PPRs.
    Table representing the 3M PPR methodology

    The 3M PPR methodology may be most easily understood by looking at the table above. For example, readmissions are not considered potentially preventable:


    • If they are unrelated to the initial admission (Patient 1)
    • If the patient has certain conditions like metastatic cancer (patient 2)
    • If the initial discharge was against medical advice (patient 3) or was a transfer to another acute care hospital (patient 4)

    Patient 5 does have a potentially preventable readmission, because heart failure is a chronic condition that would have been present and managed in the initial admission. Results from the 3M PPR software can then be used to draw comparisons, taking into account differences in case mix across different populations. Case mix adjustment reflects not only the reason for the admission but also the severity of illness.

    In 2019, 3M enhanced the PPR method by adding PPR ED logic to identify returns to the emergency department that did not result in an inpatient readmission. Previously, there was no widely available methodology to track this useful quality measure of inpatient care and of follow-up care in the community. In parallel with the 3M PPR approach, the PPR ED logic distinguishes ED visits that were and were not clinically related to an initial inpatient stay within a specified window, such as 15 or 30 days. The PPR ED logic uses diagnosis information from the ED claim to assign the visit to a 3M APR DRG, which is compared with the 3M APR DRG for the initial admission. As with 3M PPRs, supplemental logic adds precision in identifying potentially preventable revisits to the ED.

    The PPR and PPR ED software shows which specific inpatient stays and ED visits were considered potentially preventable, in each case with a defined reason for the assignment. These detailed data have proven very useful to clinicians and healthcare managers in taking action to improve outcomes. For example, a common finding is that the risk of a PPR peaks at two or three days after discharge.

    Further information on the 3M PPR and PPR ED logic is shown in an online definition manual available to all licensed clients.

    The 3M PPR and PPR ED clinical logic is maintained by a team of 3M clinicians, data analysts, nosologists, programmers and economists. The methodology is updated annually to reflect changes in the standard diagnosis and procedure code sets as well as 3M enhancements to the clinical logic.


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Learn more about 3M PPRs

Publicly available documentation, articles and reports

Please note that documents not published by 3M do not necessarily reflect 3M recommendations and have not been approved by 3M. These documents are listed here for the information of readers interested in the various ways that 3M patient classification methodologies have been applied. Also note that listing these references does not imply endorsement of 3M methodologies by individual authors, other organizations or government agencies.

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