K13.21 vs K13.24
K13.21 (Leukoplakia of oral mucosa, including tongue) compared with K13.24 (Leukokeratosis nicotina palati), 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. K13.21 carries an Excludes1 note covering K13.24: “leukokeratosis nicotina palati (K13.24)”
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
| K13.21Leukoplakia of oral mucosa, including tongue | K13.24Leukokeratosis nicotina palati | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | K00-K95 — Diseases of the Digestive System (K00-K95) |
| Definition | Leukoplakia of oral mucosa, including tongue is a billable ICD-10-CM diagnosis code (K13.21). | Leukokeratosis nicotina palati is a billable ICD-10-CM diagnosis code (K13.24). |
| Includes | epithelial disturbances of tongue Leukokeratosis of oral mucosa Leukoplakia of gingiva, lips, tongue | epithelial disturbances of tongue Smoker's palate |
| Use additional code | code to identify: alcohol abuse and dependence (F10.-) exposure to environmental tobacco smoke (Z77.22) | 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