ICD-10 code for stomach malformation

The ICD-10-CM code for stomach malformation is Q40.3 (Congenital malformation of stomach, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on Q40.3.

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.