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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