AHA Coding Clinic® for ICD-9 - 1986 January - February; Coding Guidelines

Combination Code

A single code used to classify two diagnoses or a diagnosis with an associated secondary process (manifestation) or an associated complication is called a combination code. Combination codes are identified by referring to subterm entries in the Alphabetic Index and by reading the inclusion and exclusion notes in the Tabular List. Assign only the combination code when that code fully identifies the diagnostic conditions involved or when the Alphabetic Index so directs. Be guided by directions in the Tabular List for the use of an additional code or codes to provide greater specificity. (See also the guideline for multiple...

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