ICD-10 code for thymus gland disease

The ICD-10-CM code for thymus gland disease is E32.9 (Disease of thymus, 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 E32.9.

Within E32, choose E32.9 (Disease of thymus, unspecified) only when documentation doesn't support a more specific option: persistent hyperplasia of thymus (E32.0), abscess of thymus (E32.1) and other diseases of thymus (E32.8).

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 814 (Reticuloendothelial and Immunity Disorders with MCC, relative weight 2.0729), DRG 815 (Reticuloendothelial and Immunity Disorders with CC, relative weight 1.0444) and DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC, relative weight 0.7381), in MDC 16 (Diseases and Disorders of the Blood and Blood Forming Organs and Immunological Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.