ICD-10 Code K40.40 – Unilateral inguinal hernia, with gangrene, not specified as recurrent (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K40.40 – Unilateral inguinal hernia, with gangrene, not specified as recurrent
What it is
This code identifies a one-sided inguinal hernia in which the protruding tissue has lost blood supply and become gangrenous. Use it when the record documents gangrene and does not state that the hernia is recurrent.
Clinical signs
Typical findings include a painful groin bulge with signs of strangulation, such as severe tenderness, skin changes, or systemic illness. Clinical features vary; refer to documentation.
When to use this code
Use K40.40 when the provider documents a unilateral inguinal hernia with gangrene and does not describe it as recurrent. It applies whether the side is right or left, as long as the hernia is inguinal and gangrenous. Check documentation if laterality or recurrence is unclear.
Do not use for
Do not use this code for a reducible or uncomplicated inguinal hernia, or for a hernia documented as recurrent. If the site is not inguinal, choose the appropriate hernia code instead.
Coding tip
Confirm both gangrene and the nonrecurrent status in the note before assigning K40.40.