ICD-10 Code K60.329 – Anal fistula, complex, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K60.329 – Anal fistula, complex, unspecified
What it is
This code identifies an anal fistula described as complex, but the record does not specify the exact type or anatomy. Use it when documentation confirms a complex fistula and no further detail is available.
Clinical signs
Clinical features may include persistent anal drainage, recurrent perianal infection, pain, or swelling. Complex fistulas often have branching tracts or involve more than one sphincter plane; check documentation.
When to use this code
Use K60.329 when the provider documents a complex anal fistula and does not name a more specific fistula subtype. It also fits when the note confirms complexity, but the tract course or relationship to the sphincter is not recorded. If the record is unclear, check documentation.
Do not use for
Do not use this code for a simple anal fistula or for an anal abscess without a documented fistula. Avoid it when a more specific fistula code is supported by the chart.
Coding tip
Code from the provider’s description of complexity and specificity, and query if the note does not clearly support K60.329.