K04.7 vs K05.21
K04.7 (Periapical abscess without sinus) compared with K05.21 (Aggressive periodontitis, localized), 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. K05.21 carries an Excludes1 note covering K04.7: “periapical abscess (K04.7)”
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
| K04.7Periapical abscess without sinus | K05.21Aggressive periodontitis, localized | |
|---|---|---|
| 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 | Periapical abscess without sinus is a billable ICD-10-CM diagnosis code (K04.7). | Aggressive periodontitis, localized is a non-billable ICD-10-CM category code (K05.21). |
| Includes | Dental abscess without sinus Dentoalveolar abscess without sinus | Periodontal abscess |
| 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