ICD-10 code for appendix duplication

The ICD-10-CM code for appendix duplication is Q43.4 (Duplication of intestine).

Within Q43 (other congenital malformations of intestine), Q43.4 is specifically for duplication of intestine. Related codes cover Meckel's diverticulum (displaced) (hypertrophic) (Q43.0), Hirschsprung's disease (Q43.1), other congenital functional disorders of colon (Q43.2), congenital malformations of intestinal fixation (Q43.3), ectopic anus (Q43.5), congenital fistula of rectum and anus (Q43.6), persistent cloaca (Q43.7), other specified congenital malformations of intestine (Q43.8) and 1 more.

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

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.