ICD-10 Code K05.321 – Chronic periodontitis, generalized, slight (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K05.321 – Chronic periodontitis, generalized, slight
What it is
K05.321 identifies chronic periodontitis affecting multiple teeth throughout the mouth with slight severity. It describes a long-term inflammatory disease of the supporting tissues around the teeth.
Clinical signs
Typical findings include inflamed gums, periodontal pocketing, and loss of attachment around several teeth. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly documents chronic periodontitis that is generalized and mild in extent. You should also use it when the dentist or periodontist specifies slight severity and involvement across the dentition.
Choose this code only if the documentation distinguishes chronic disease from localized or aggressive forms. Check documentation if the extent or severity is unclear.
Do not use for
Do not use it for localized periodontitis, gingivitis, or periodontal disease without chronic and generalized descriptors. Do not assume severity if the note does not state slight.
Coding tip
Match all three elements exactly: chronic, generalized, and slight; if one is missing, verify the provider note before coding.