ICD-10 code for rectum endometriosis

The ICD-10-CM code for rectum endometriosis is N80.519 (Endometriosis of the rectum, unspecified depth). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N80.519.

Within N80.51, choose N80.519 (unspecified depth) only when documentation doesn't support a more specific option: superficial endometriosis of the rectum (N80.511) and deep endometriosis of the rectum (N80.512).

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 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), 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.