ICD-10-CM 2027
ICD-10 code for duodenum anomaly
Congenital malformation of intestine, unspecified
From the official ICD-10-CM alphabetic index entry “Anomaly, anomalous (congenital) (unspecified type) › duodenum”. Page updated September 29, 2026.
About coding duodenum anomaly
The ICD-10-CM code for duodenum anomaly is Q43.9 (Congenital malformation of intestine, unspecified).
Within Q43, choose Q43.9 (Congenital malformation of intestine, unspecified) only when documentation doesn't support a more specific option: 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), duplication of intestine (Q43.4), ectopic anus (Q43.5), congenital fistula of rectum and anus (Q43.6), persistent cloaca (Q43.7) 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.
Common questions about duodenum anomaly ICD-10 codes
What is the ICD-10 code for duodenum anomaly?
- Q43.9 — Congenital malformation of intestine, unspecified.
Is Q43.9 billable?
- Yes. Q43.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q43.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q43.9 as a principal diagnosis.
Is Q43.9 a CC or MCC?
- Q43.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.