AAPC CPC Question Answer
Which punctuation is used in the ICD-10-CM Alphabetic Index to identify manifestation codes?
Colons
Brackets
Semicolon
Parentheses
Brackets [ ] in the ICD-10-CM Alphabetic Index are used to identify manifestation codes.
These codes cannot be reported as the principal diagnosis and must be sequenced after the underlying condition.
This is a frequently tested ICD-10-CM guideline concept.
TESTED 15 Feb 2026
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