Using ICD-9-CM and CPT in the nineties.
Levitsky
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D000043:Abstracting and Indexing; D006348:Cardiac Surgical Procedures / Q000145:classification / Q000191:economics*; D006801:Humans; D007344:Insurance Claim Reporting; D016345:Medicare Part B / Q000639:trends*; D013903:Thoracic Surgery / Q000145:classification / Q000191:economics*; D014481:United States