ICD-10 code for lupus erythematosus system

The ICD-10-CM code for lupus erythematosus system is M32.9 (Systemic lupus erythematosus, 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 M32.9.

Within M32, choose M32.9 (Systemic lupus erythematosus, unspecified) only when documentation doesn't support a more specific option: drug-induced systemic lupus erythematosus (M32.0), systemic lupus erythematosus with organ or system involvement (M32.1) and other forms of systemic lupus erythematosus (M32.8).

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 545 (Connective Tissue Disorders with MCC, relative weight 2.3892), DRG 546 (Connective Tissue Disorders with CC, relative weight 1.1745) and DRG 547 (Connective Tissue Disorders without CC/MCC, relative weight 0.7526), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.