ICD-10-CM 2027
ICD-10 code for stomach anomaly
From the official ICD-10-CM alphabetic index entry “Anomaly, anomalous (congenital) (unspecified type) › stomach”. Page updated September 29, 2026.
About coding stomach anomaly
The ICD-10-CM code for stomach anomaly is Q40.3 (Congenital malformation of stomach, unspecified).
Within Q40, choose Q40.3 (Congenital malformation of stomach, unspecified) only when documentation doesn't support a more specific option: congenital hypertrophic pyloric stenosis (Q40.0), congenital hiatus hernia (Q40.1), other specified congenital malformations of stomach (Q40.2), other specified congenital malformations of upper alimentary tract (Q40.8) and congenital malformation of upper alimentary tract, unspecified (Q40.9).
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.
Common questions about stomach anomaly ICD-10 codes
What is the ICD-10 code for stomach anomaly?
- Q40.3 — Congenital malformation of stomach, unspecified.
Is Q40.3 billable?
- Yes. Q40.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q40.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q40.3 as a principal diagnosis.
Is Q40.3 a CC or MCC?
- No. Q40.3 is neither a CC nor an MCC under MS-DRG v44.0.