ICD-10 Code K60.523 – Anorectal fistula, complex, recurrent (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K60.523 – Anorectal fistula, complex, recurrent
What it is
This code identifies a recurrent anorectal fistula that is complex, meaning the tract is not simple and may involve deeper structures or branching. Use it when the documentation clearly states both complexity and recurrence.
Clinical signs
Typical findings include a persistent or recurring opening near the anus with drainage, pain, or irritation. Clinical features vary; refer to documentation for details such as prior fistula history, tract complexity, or repeated episodes.
When to use this code
Use K60.523 when the provider documents a complex anorectal fistula that has returned after prior treatment or healing. It is appropriate when the record specifically supports recurrence rather than a first episode. If the note only says “fistula” without complexity or recurrence, check documentation.
Do not use for
Do not use this code for a simple, nonrecurrent anorectal fistula or for other anal disorders without fistula formation. If the documentation does not confirm complexity and recurrence, choose a more specific or different code after review.
Coding tip
Verify that the record supports both “complex” and “recurrent” before assigning K60.523.