ICD-10 code for autoinflammatory disease

The ICD-10-CM code for autoinflammatory disease is M04.9 (Autoinflammatory syndrome, unspecified). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M04.9.

Within M04, choose M04.9 (Autoinflammatory syndrome, unspecified) only when documentation doesn't support a more specific option: periodic fever syndromes (M04.1), Cryopyrin-associated periodic syndromes (M04.2), VEXAS syndrome (M04.3) and other autoinflammatory syndromes (M04.8).

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.