K59.3 vs Q43.1
K59.3 (Megacolon, not elsewhere classified) compared with Q43.1 (Hirschsprung's disease), 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. K59.3 carries an Excludes1 note covering Q43.1: “congenital megacolon (aganglionic) (Q43.1)”
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. K59.3 carries an Excludes1 note covering Q43.1: “megacolon (due to) (in) Hirschsprung's disease (Q43.1)”
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
| K59.3Megacolon, not elsewhere classified | Q43.1Hirschsprung's disease | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) |
| Definition | Megacolon, not elsewhere classified is a non-billable ICD-10-CM category code (K59.3). | Hirschsprung's disease is a billable ICD-10-CM diagnosis code (Q43.1). |
| Includes | Dilatation of colon | Aganglionosis Congenital (aganglionic) megacolon |
| Code first | , if applicable (T51-T65) to identify toxic agent | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources