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Do both conditions truly meet the definition of principal diagnosis?

According to the ICD-9-CM Official Guidelines for Coding and Reporting, it’s unusual for two or more diagnoses to meet the definition of principal diagnosis. Coders know the opposite is true. William E. Haik, MD, FCCP, CDIP, Donna Didier, MEd, RHIA, CCS, and Cheryl Ericson, MS, RN, CCDS, CDIP, offer tips for determining whether multiple conditions meet the criteria for principal diagnosis.

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