ICD-10 Code K40.4 – Unilateral inguinal hernia, with gangrene (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K40.4 – Unilateral inguinal hernia, with gangrene
What it is
This code identifies a one-sided inguinal hernia complicated by gangrene, meaning the trapped herniated tissue has lost blood supply and become necrotic. Use it when documentation clearly states gangrene.
Clinical signs
Typical findings include a painful groin bulge that may be irreducible, with signs of tissue compromise. Clinical features vary; refer to documentation for evidence of gangrene or strangulation.
When to use this code
Use K40.4 when the provider documents a unilateral inguinal hernia and specifically notes gangrene. It applies to right or left inguinal hernias when laterality is not otherwise separated in the code title. If the record only says incarcerated or strangulated without gangrene, check documentation before coding.
Do not use for
Do not use this code for an inguinal hernia without gangrene, or when the note only describes reducible hernia. Do not assume gangrene from pain, swelling, or obstruction alone.
Coding tip
Code the hernia type and complication exactly as documented; if gangrene is not explicit, verify the record before assigning K40.4.