ICD-10 Code K61.39 – Other ischiorectal abscess (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K61.39 – Other ischiorectal abscess
What it is
K61.39 identifies an abscess in the ischiorectal space that is not otherwise specified by a more exact perianal or anorectal abscess code. It reflects a localized pus collection in the deep tissue beside the anal canal.
Clinical signs
Patients commonly have pain, swelling, and tenderness near the anus or in the buttock area. Clinical features vary; refer to documentation for drainage, fluctuance, erythema, or other findings supporting an ischiorectal abscess.
When to use this code
Use this code when the provider documents an ischiorectal abscess and the record does not support a more specific anorectal abscess category. It may apply after exam, imaging, or surgical findings confirm the location. Code the documented site, not a presumed one.
Do not use for
Do not use it for a simple perianal abscess, fistula, or abscess at another anorectal site. Check documentation if the record only says “perirectal abscess” without confirming the ischiorectal space.
Coding tip
Verify the exact anatomic location in the operative note or assessment before assigning K61.39.