K04.4 vs K05.2
K04.4 (Acute apical periodontitis of pulpal origin) compared with K05.2 (Aggressive periodontitis), 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. K04.4 carries an Excludes1 note covering K05.2: “acute periodontitis (K05.2-)”
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. K05.2 carries an Excludes1 note covering K04.4: “acute apical periodontitis (K04.4)”
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
| K04.4Acute apical periodontitis of pulpal origin | K05.2Aggressive periodontitis | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | K00-K95 — Diseases of the Digestive System (K00-K95) |
| Definition | Acute apical periodontitis of pulpal origin is a billable ICD-10-CM diagnosis code (K04.4). | Aggressive periodontitis is a non-billable ICD-10-CM category code (K05.2). |
| Includes | Acute apical periodontitis NOS | Acute pericoronitis |
| 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