ICD-10-CM 2027
ICD-10 code for generalized periodontitis
From the official ICD-10-CM alphabetic index entry “Periodontitis (chronic) (complex) (compound) (local) (simplex) › generalized”. Page updated September 29, 2026.
About coding generalized periodontitis
The ICD-10-CM code for generalized periodontitis is K05.329 (Chronic periodontitis, generalized, unspecified severity). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K05.329.
Within K05.32, choose K05.329 (unspecified severity) only when documentation doesn't support a more specific option: slight (K05.321), moderate (K05.322) and severe (K05.323).
Use an additional code to identify: alcohol abuse and dependence (F10.-), exposure to environmental tobacco smoke (Z77.22), exposure to tobacco smoke in the perinatal period (P96.81), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31) and 2 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific generalized periodontitis codes (official index)
Common questions about generalized periodontitis ICD-10 codes
What is the ICD-10 code for generalized periodontitis?
- K05.329 — Chronic periodontitis, generalized, unspecified severity. More specific codes apply when the documentation supports them: K05.322, K05.323, K05.321.
What is the ICD-10 code for moderate generalized periodontitis?
- K05.322 — Chronic periodontitis, generalized, moderate.
What is the ICD-10 code for severe generalized periodontitis?
- K05.323 — Chronic periodontitis, generalized, severe.
What is the ICD-10 code for slight generalized periodontitis?
- K05.321 — Chronic periodontitis, generalized, slight.
Is K05.329 billable?
- Yes. K05.329 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K05.329 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K05.329 as a principal diagnosis.
Is K05.329 a CC or MCC?
- No. K05.329 is neither a CC nor an MCC under MS-DRG v44.0.