Q20 vs Q89.3
Q20 (Congenital malformations of cardiac chambers and connections) compared with Q89.3 (Situs inversus), 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. Q20 carries an Excludes1 note covering Q89.3: “dextrocardia with situs inversus (Q89.3)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. Q20 carries an Excludes1 note covering Q89.3: “mirror-image atrial arrangement with situs inversus (Q89.3)”
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
| Q20Congenital malformations of cardiac chambers and connections | Q89.3Situs inversus | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) |
| Definition | Congenital malformations of cardiac chambers and connections is a non-billable ICD-10-CM category code (Q20). | Situs inversus is a billable ICD-10-CM diagnosis code (Q89.3). |
| Includes | — | Dextrocardia with situs inversus Mirror-image atrial arrangement with situs inversus Situs inversus or transversus abdominalis Situs inversus or transversus thoracis |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources