K40.91Unilateral inguinal hernia, without obstruction or gangrene, recurrent

K40.91 is the ICD-10-CM diagnosis code for unilateral inguinal hernia, without obstruction or gangrene, recurrent. It belongs to category K40 (inguinal hernia), block K40-K46 (hernia) and chapter 11 (diseases of the digestive system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within K40.9 (unilateral inguinal hernia, without obstruction or gangrene), K40.91 is specifically for unilateral inguinal hernia, without obstruction or gangrene, recurrent. Related codes cover not specified as recurrent (K40.90).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 550.91 (inguinal hernia, without mention of obstruction or gangrene, unilateral or unspecified, recurrent).