ICD-10 Code K04.6 – Periapical abscess with sinus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K04.6 – Periapical abscess with sinus
What it is
K04.6 identifies a periapical dental infection at the root tip that has formed a draining sinus tract. Use it when the record documents an abscess with sinus connected to the affected tooth.
Clinical signs
Typical findings include localized tooth pain, swelling, and drainage from a sinus tract near the involved tooth. Clinical features vary; refer to documentation for confirmed periapical involvement.
When to use this code
Use this code when the dentist or clinician documents a periapical abscess with sinus, including a draining tract from the tooth root area. It fits cases where the infection is described as chronic or draining and tied to a specific tooth. If the note only says dental abscess without sinus, check documentation.
Do not use for
Do not use K04.6 for a periapical abscess without sinus, or for gingival, periodontal, or other oral infections not centered at the tooth apex. Check documentation if the record is unclear.
Coding tip
Code the sinus tract only when the provider documents it; otherwise, verify whether a different periapical abscess code applies.