ICD-10 Code K05.0 – Acute gingivitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K05.0 – Acute gingivitis
What it is
K05.0 identifies acute gingivitis, an abrupt inflammation of the gums. It is used when the gingival tissue is newly irritated or infected and the record supports an acute presentation.
Clinical signs
Typical findings include red, swollen, tender gums that may bleed easily with brushing or probing. Clinical features vary; refer to documentation if the note does not clearly describe acute gingival inflammation.
When to use this code
Use K05.0 when the provider documents acute gingivitis or clearly describes a short-term inflammatory gum condition. It may fit visits for localized gingival redness, bleeding, or pain when the diagnosis is specifically acute. If the record is vague, check documentation before coding.
Do not use for
Do not use this code for chronic gingivitis, periodontitis, or nonspecific oral pain without documented gingival inflammation. Check documentation if the note describes generalized periodontal disease instead.
Coding tip
Assign K05.0 only when the provider links the encounter to acute gingival inflammation, not just plaque, dental cleaning, or mouth soreness.