ICD-10-CM 2027
ICD-10 code for periapical infection
From the official ICD-10-CM alphabetic index entry “Infection, infected, infective (opportunistic) › periapical”. Page updated September 29, 2026.
About coding periapical infection
The ICD-10-CM code for periapical infection is K04.5 (Chronic apical periodontitis).
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.
Don't confuse with (Excludes1 for K04.5)
- chronic periodontitis (K05.3-)
Common questions about periapical infection ICD-10 codes
What is the ICD-10 code for periapical infection?
- K04.5 — Chronic apical periodontitis.
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.