AHA Coding Clinic® for ICD-9 - 1986 January - February; Coding Guidelines
Acute and Chronic Condition
When a particular condition is described as both acute or subacute and chronic, code according to the Alphabetic Index subentries (including those enclosed in parentheses) for that condition, such as: Whenever separate subentries for acute (subacute) and chronic are listed, code both and sequence the acute condition first. When there are no subentries for acute (subacute) or chronic, disregard these modifiers in coding the particular condition. When the Index does not provide a subentry for a condition described as subacute, code the condition as acute. Examples Acute and chronic appendicitis, 540.9 and 542 Note: As of October 1...
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Article Overview
This article explains how to interpret condition terminology in the Alphabetic Index when a diagnosis is described as acute, subacute, and/or chronic. It is relevant to coders who need to understand how index subentries affect code assignment, especially when a condition appears in more than one time-based form or when no matching subentry is listed. The article also references example diagnoses and a Coding Clinic note about cholecystitis code changes.
Why This Topic Matters
Accurate interpretation of acute, subacute, and chronic terminology affects diagnosis code selection and sequencing. The article is useful for coding professionals seeking guidance on index-based reporting conventions and related documentation scenarios.
What You Will Learn
- How the Alphabetic Index handles conditions described with acute, subacute, and chronic terminology
- What to do when separate index subentries are present or absent
- How the article frames example diagnoses involving time-based condition terms
- What related Coding Clinic context is mentioned for cholecystitis
Who Should Read This
- Medical coders
- Coding educators
- Coding auditors
- Clinical documentation specialists
Codes Discussed
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