Q23.0 vs Q24.4
Q23.0 (Congenital stenosis of aortic valve) compared with Q24.4 (Congenital subaortic stenosis), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. Q23.0 carries an Excludes1 note covering Q24.4: “congenital subaortic stenosis (Q24.4)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| Q23.0Congenital stenosis of aortic valve | Q24.4Congenital subaortic stenosis | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) |
| Definition | Congenital stenosis of aortic valve is a billable ICD-10-CM diagnosis code (Q23.0). | Congenital subaortic stenosis is a billable ICD-10-CM diagnosis code (Q24.4). |
| Includes | Congenital aortic atresia Congenital aortic stenosis NOS | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources