ICD-10 Code K40.31 – Unilateral inguinal hernia, with obstruction, without gangrene, recurrent (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K40.31 – Unilateral inguinal hernia, with obstruction, without gangrene, recurrent
What it is
K40.31 identifies a recurrent inguinal hernia on one side that is causing obstruction, but there is no gangrene. Use it when the hernia has come back after prior repair and bowel or tissue passage is blocked.
Clinical signs
Typical findings include a groin bulge, pain, tenderness, and symptoms of obstruction such as nausea, vomiting, or abdominal distention. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly states a unilateral inguinal hernia is recurrent and obstructed, with no gangrene. It fits postoperative recurrence, as long as the provider documents the current episode as obstructed. Check documentation if laterality or recurrence is unclear.
Do not use for
Do not use K40.31 if the hernia is not recurrent, if there is no obstruction, or if gangrene is present. Do not assign it when the side is not documented and cannot be inferred safely.
Coding tip
Confirm all three elements—unilateral, recurrent, and obstructed—before coding, because missing any one changes the ICD-10 choice.