ICD-10 Code K60.311 – Anal fistula, simple, initial (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K60.311 – Anal fistula, simple, initial
What it is
K60.311 identifies a simple anal fistula during the initial encounter. Use it when documentation confirms a fistulous tract involving the anal region and the case is specifically described as simple.
Clinical signs
Typical findings include persistent drainage near the anus, local irritation, and a small external opening. Clinical features vary; refer to documentation, and confirm the fistula is described as simple.
When to use this code
Use this code when the record states anal fistula, simple, and the encounter is initial. It fits evaluation or treatment visits where the diagnosis is established but not yet resolved. Check documentation if complexity, recurrence, or another anorectal condition is noted.
Do not use for
Do not use this code if the fistula is not documented as simple or if the encounter is not initial. Do not code it when the chart describes another anorectal diagnosis instead.
Coding tip
Match the provider’s wording exactly; if “simple” or “initial” is missing, check documentation before assigning K60.311.