ICD-10 Code K60.51 – Anorectal fistula, simple (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K60.51 – Anorectal fistula, simple
What it is
K60.51 identifies a simple anorectal fistula, an abnormal tract between the anal canal or rectum and nearby skin. Use it when documentation specifies a straightforward fistula without complexity.
Clinical signs
Typical findings include persistent drainage near the anus, local irritation, and a visible or palpable external opening. Clinical features vary; refer to documentation.
When to use this code
Use K60.51 when the provider documents a simple anorectal fistula, including a fistula-in-ano described as uncomplicated. Apply it when the record supports a single, non-complex tract and does not describe Crohn disease, abscess-related complexity, or other qualifying detail. Check documentation if the anatomy is unclear.
Do not use for
Do not use this code for anal fissure, perianal abscess, or complex fistula patterns. If the note does not clearly state “simple,” verify the documentation before assigning K60.51.
Coding tip
Look for the exact wording “simple” and confirm the fistula type before coding.