ICD-10-CM 2027
ICD-10 code for apical periodontitis
From the official ICD-10-CM alphabetic index entry “Periodontitis (chronic) (complex) (compound) (local) (simplex) › apical”. Page updated September 29, 2026.
About coding apical periodontitis
The ICD-10-CM code for apical periodontitis is K04.5 (Chronic apical periodontitis). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on K04.5.
Within K04 (diseases of pulp and periapical tissues), K04.5 is specifically for chronic apical periodontitis. Related codes cover pulpitis (K04.0), necrosis of pulp (K04.1), pulp degeneration (K04.2), abnormal hard tissue formation in pulp (K04.3), acute apical periodontitis of pulpal origin (K04.4), periapical abscess with sinus (K04.6), periapical abscess without sinus (K04.7), Radicular cyst (K04.8) and 1 more.
Don't report K04.5 together with the conditions in its Excludes1 note: chronic periodontitis (K05.3-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific apical periodontitis codes (official index)
- acute (pulpal origin) K04.4 — Acute apical periodontitis of pulpal origin
Don't confuse with (Excludes1 for K04.5)
- chronic periodontitis (K05.3-)
Common questions about apical periodontitis ICD-10 codes
What is the ICD-10 code for apical periodontitis?
- K04.5 — Chronic apical periodontitis. More specific codes apply when the documentation supports them: K04.4.
What is the ICD-10 code for acute apical periodontitis?
- K04.4 — Acute apical periodontitis of pulpal origin.
Is K04.5 billable?
- Yes. K04.5 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K04.5 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K04.5 as a principal diagnosis.
Is K04.5 a CC or MCC?
- No. K04.5 is neither a CC nor an MCC under MS-DRG v44.0.