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Relationship Between Diabetes Codes That Affect Medicare Reimbursement (Tier Comorbidities) and Outcomes in Stroke Rehabilitation

      Abstract

      Graham JE, Ripsin CM, Deutsch A, Kuo Y-F, Markello S, Granger CV, Ottenbacher KJ. Relationship between diabetes codes that affect Medicare reimbursement (tier comorbidities) and outcomes in stroke rehabilitation.

      Objectives

      To examine the extent to which diabetes codes that increase reimbursement (tier comorbidities) under the prospective payment system are related to length of stay and functional outcomes in stroke rehabilitation.

      Design

      Secondary data analysis.

      Setting

      Inpatient rehabilitation facilities (N=864) across the United States.

      Participants

      Patients (N=135,097) who received medical rehabilitation for stroke in 2002–2003.

      Intervention

      None.

      Main Outcome Measures

      Length of stay, FIM instrument, and discharge setting. Diabetes status was assigned to 1 of 3 categories: tier (increases reimbursement), nontier (no reimbursement effect), and no diabetes.

      Results

      Mean ± standard deviation age of the sample was 70.4±13.4 years, and 31% had diabetes (6% tier, 25% nontier). Diabetes status by age demonstrated significant (P<.05) interaction effects, which lead to the following age-specific findings. In younger stroke patients (60y), tier diabetes was associated with shorter lengths of stay compared with both groups, lower FIM discharge scores compared with both groups, and lower odds of discharge home relative to the no-diabetes group. In older stroke patients (80y), tier diabetes was associated with longer lengths of stay compared with both groups and with higher FIM discharge scores compared with the nontier group.

      Conclusions

      The diabetes-related conditions identified as tier comorbidities under the prospective payment system are significant predictors of stroke rehabilitation outcomes, but these relationships are moderated by patient age.

      Key Words

      List of Abbreviations:

      ICD-9 (International Classification of Disease, 9th edition), IRF-PAI (Inpatient Rehabilitation Facility—Patient Assessment Instrument), IRF-PPS (Inpatient Rehabilitation Facility—Prospective Payment System), UDSmr (Uniform Data System for Medical Rehabilitation)
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