ICD-10 Code K60.429 – Rectal fistula, complex, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K60.429 – Rectal fistula, complex, unspecified
What it is
This code identifies a rectal fistula described as complex, but without further detail on type or cause. Use it when the record confirms a rectal fistula and documentation does not specify a more exact classification.
Clinical signs
Clinical features vary; refer to documentation. Commonly, a fistula is noted by persistent abnormal drainage, local irritation, or recurrent infection involving the rectal area.
When to use this code
Use K60.429 when the provider documents a complex rectal fistula and does not identify a more specific subtype. It also fits when the chart confirms the condition but leaves the anatomy or cause unclear. Check documentation if the note suggests abscess, Crohn disease, or another related disorder.
Do not use for
Do not use this code for a simple rectal fistula or for an anal fistula coded elsewhere. If the documentation supports a different anorectal diagnosis, code that condition instead.
Coding tip
Confirm that “complex” is explicitly documented before assigning this code.