ICD-10 Code K60.529 – Anorectal fistula, complex, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K60.529 – Anorectal fistula, complex, unspecified
What it is
This code identifies a complex anorectal fistula when the exact type is not further specified in the record. Use it for an abnormal tract involving the anorectal area that is described as complex.
Clinical signs
Common findings include persistent drainage, recurrent perianal infection, pain, or an external opening near the anus. Clinical features vary; refer to documentation.
When to use this code
Use K60.529 when the provider documents a complex anorectal fistula but does not name a more specific subtype. It also fits cases where the record confirms complexity without enough detail for a more exact code. Check documentation if the anatomy or classification is unclear.
Do not use for
Do not use this code for a simple or unspecified anal fistula if the documentation does not support complexity. Do not assign it when the condition is better described as a different anorectal disorder.
Coding tip
Confirm that “complex” is explicitly documented before choosing this code, and query the provider if the fistula type is not stated.