ICD-10 Code K42.1 – Umbilical hernia with gangrene (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K42.1 – Umbilical hernia with gangrene
What it is
K42.1 identifies an umbilical hernia in which the herniated tissue has lost blood supply and become gangrenous. Use this code when the umbilical hernia is documented with necrosis or gangrene.
Clinical signs
Clinical findings may include a painful, irreducible umbilical bulge with signs of tissue compromise. Clinical features vary; refer to documentation for evidence of gangrene or necrotic tissue.
When to use this code
Use K42.1 when the provider documents an umbilical hernia and specifically states gangrene. It may also apply when the record clearly describes strangulated or necrotic hernia contents, but you should code only what is documented. If the note is unclear, check documentation.
Do not use for
Do not use this code for an uncomplicated umbilical hernia or for hernias without gangrene. Do not assume gangrene from pain alone; check documentation.
Coding tip
Look for explicit language such as “gangrenous,” “necrotic,” or “with gangrene” before assigning K42.1.