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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Article Overview
This article covers the concept of combination codes in diagnosis coding, focusing on how a single code can represent related clinical conditions and how coders locate these codes in the Alphabetic Index and Tabular List. It is relevant to coders and compliance teams working with diagnosis classification guidance and related ICD-9-CM conventions.
Why This Topic Matters
Understanding combination codes helps ensure diagnoses are captured at the correct level of specificity and supports consistent code selection when more than one condition is represented in a single code.
What You Will Learn
- What a combination code is in diagnosis coding
- How combination codes are identified in the coding resources
- How guidance in the Tabular List affects code assignment
- How combination code concepts relate to multiple coding guidance
Who Should Read This
- Medical coders
- Coding auditors
- Revenue cycle staff
- Compliance teams
- Clinical documentation improvement staff
Codes Discussed
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