ICD-10-CM 2027
ICD-10 code for ostium
Choose a code from the options below based on the documentation.
From the official ICD-10-CM alphabetic index entry “Ostium”. Page updated September 29, 2026.
About coding ostium
The official ICD-10-CM index doesn't give a single default code for ostium; the code depends on the details below.
More specific ostium codes (official index)
Common questions about ostium ICD-10 codes
What is the ICD-10 code for atrioventriculare commune ostium?
- Q21.23 — Complete atrioventricular septal defect.
What is the ICD-10 code for primum ostium?
- Q21.20 — Atrioventricular septal defect, unspecified as to partial or complete.
What is the ICD-10 code for secundum ostium?
- Q21.11 — Secundum atrial septal defect.