K12.3 vs K92.81
K12.3 (Oral mucositis (ulcerative)) compared with K92.81 (Gastrointestinal mucositis (ulcerative)), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. K12.3 carries an Excludes2 note covering K92.81: “gastrointestinal mucositis (ulcerative) (K92.81)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. K92.81 carries an Excludes2 note covering K12.3: “oral mucositis (ulcerative) (K12.3-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| K12.3Oral mucositis (ulcerative) | K92.81Gastrointestinal mucositis (ulcerative) | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | K00-K95 — Diseases of the Digestive System (K00-K95) |
| Definition | Oral mucositis (ulcerative) is a non-billable ICD-10-CM category code (K12.3). | Gastrointestinal mucositis (ulcerative) is a billable ICD-10-CM diagnosis code (K92.81). |
| Includes | Mucositis (oral) (oropharyneal) | — |
| Use additional code | code to identify: alcohol abuse and dependence (F10.-) exposure to environmental tobacco smoke (Z77.22) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources