ICD-10 Code K61.0 – Anal abscess (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K61.0 – Anal abscess
What it is
K61.0 identifies an abscess in the anal region, meaning a localized pocket of pus near the anus. It is used when documentation specifically states an anal abscess.
Clinical signs
Typical findings include anal pain, swelling, redness, and tenderness, sometimes with drainage or fever. Clinical features vary; refer to documentation if the record does not clearly describe the abscess location.
When to use this code
Use K61.0 when the provider documents an abscess involving the anus or anal area. Choose it for confirmed anal abscesses in outpatient, emergency, or inpatient records when the diagnosis is explicit.
If the note says perianal, anorectal, or another nearby site, check documentation carefully before assigning K61.0. Make sure the record distinguishes this condition from fistula, hemorrhoids, or nonspecific perirectal infection.
Do not use for
Do not use K61.0 for a simple anal pain complaint, hemorrhoids, or a fistula without an abscess. If the site is unclear, check documentation.
Coding tip
Code K61.0 only when the provider clearly documents an anal abscess, and verify the anatomic site before finalizing the claim.