title: Sensitivity and positive predictive value of Medicare Part B physician claims for rheumatologic diagnoses and procedures.
abstract: OBJECTIVE
  To examine the sensitivity and positive predictive value of Medicare physician claims for select rheumatic conditions managed in rheumatology specialty practices.
  
  
  METHODS
  Eight rheumatologists in 3 states abstracted 378 patient office records to obtain information on diagnosis and office procedures. The Medicare Part B physician claims for these patient visits were obtained from the Health Care Financing Administration. The sensitivity of the claims data for a specific diagnosis was calculated as the proportion of all patients whose office records for a particular visit documented that diagnosis and who also had physician claims for that visit which identified that diagnosis. The positive predictive value was evaluated in a separate sample of 331 patient visits identified in Medicare physician claims. The positive predictive value of the claims data for a specific diagnosis was calculated as the proportion of patients with that diagnosis coded in the claims for a particular visit who also had the diagnosis documented in the medical record for that visit.
  
  
  RESULTS
  Ninety percent of abstracted office medical records were matched successfully with Medicare physician claims. The sensitivity of the Medicare physician claims was 0.90 (95% confidence interval [CI] 0.85-0.95) for rheumatoid arthritis (RA), 0.85 (95% CI 0.73-0.97) for systemic lupus erythematosus (SLE), and 0.85 (95% CI 0.78-1.0) for aspiration or injection procedures. The sensitivity for osteoarthritis (OA) of the hip or knee was < or = 0.50 if 5-digit codes specifying anatomic site were required. The sensitivity for fibromyalgia (FM) was 0.48 (95% CI 0.28-0.68). The positive predictive values were at least 0.90 for RA, SLE, and aspiration or injection procedures. Positive predictive values for FM and the 5-digit site-specific codes for OA of the knee were 0.83 (95% CI 0.66-1.0) and 0.88 (95% CI 0.75-1.0), respectively, while the positive predictive value of the 5-digit site-specific codes for OA of the hip was zero (95% CI 0-0.26). The positive predictive value of OA at any site was 0.83 (95% CI 0.76-0.90).
  
  
  CONCLUSIONS
  In specialty practice, Medicare physician claims had high sensitivity and positive predictive value for RA, SLE, OA without specification of anatomic site, and injection or aspiration procedures. The claims had lower sensitivity and predictive value for FM and for OA of the hip. The accuracy of Medicare physician claims for other conditions and in the primary care setting requires further investigation.
authors.affiliation: Robert Brigham Multipurpose Arthritis and Musculoskeletal Diseases Center, Brigham and Women's Hospital, and Harvard Medical School, Boston, Massachusetts 02115, USA.
authors.forename: J N
authors.initials: JN
authors.lastname: Katz
authors.forename: J
authors.initials: J
authors.lastname: Barrett
authors.forename: M H
authors.initials: MH
authors.lastname: Liang
authors.forename: A M
authors.initials: AM
authors.lastname: Bacon
authors.forename: H
authors.initials: H
authors.lastname: Kaplan
authors.forename: R I
authors.initials: RI
authors.lastname: Kieval
authors.forename: S M
authors.initials: SM
authors.lastname: Lindsey
authors.forename: W N
authors.initials: WN
authors.lastname: Roberts
authors.forename: D M
authors.initials: DM
authors.lastname: Sheff
authors.forename: R T
authors.initials: RT
authors.lastname: Spencer
authors.forename: A L
authors.initials: AL
authors.lastname: Weaver
authors.forename: J A
authors.initials: JA
authors.lastname: Baron
mesh_terms: D000368:Aged; D016208:Databases, Factual; D005102:Health Expenditures; D006801:Humans; D007344:Insurance Claim Reporting / Q000706:statistics & numerical data*; D008499:Medical Records; D016345:Medicare Part B / Q000706:statistics & numerical data*; D011237:Predictive Value of Tests; D012216:Rheumatic Diseases / Q000175:diagnosis* / Q000628:therapy*; D012680:Sensitivity and Specificity; D014481:United States