ICD-10-CM 2027
ICD-10 code for Additional
Choose a code from the options below based on the documentation.
From the official ICD-10-CM alphabetic index entry “Additional”. Page updated September 29, 2026.
About coding Additional
The official ICD-10-CM index doesn't give a single default code for additional; the code depends on the details below.
More specific Additional codes (official index)
- chromosome (s) Q99.8 — Other specified chromosome abnormalities
- marker
- sex
- 21
Common questions about Additional ICD-10 codes
What is the ICD-10 code for chromosome additional?
- Q99.8 — Other specified chromosome abnormalities (header code; choose a more specific subcode).