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Medical insurance claims are increasingly important as a source of data in monitoring health care utilization and patient outcomes and in ident:(ying patient cohorts f or research. in a study that attempted to wr (y that those with Medicaid claims for treatment of schizophrenia did indeed have the disorder, twopsychiatrists evaluated dinical information obtained from primary mental health care providers in relation to DSM-iii-R criteria. The psychiatrists classafied 86.8 percent of319 patients with claimsfor treatment of schizophrenia and 27.5 percent of 156 patients with claimsfor treatment of other psychiatric diagnoses as definitely or probably having schizophrenia. The authors condude that most diagnoses of schizophrenia listed on Medicaid claims are accurate, but that a substantial number of individuals with schizophrenia may not be ident:(ied by claims data.

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