G72.49Other inflammatory and immune myopathies, not elsewhere classified

G72.49 is the ICD-10-CM diagnosis code for other inflammatory and immune myopathies, not elsewhere classified. It belongs to category G72 (other and unspecified myopathies), block G70-G73 (diseases of myoneural junction and muscle) and chapter 6 (diseases of the nervous system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within G72.4, choose G72.49 (Other inflammatory and immune myopathies, not elsewhere classified) only when documentation doesn't support a more specific option: inclusion body myositis [IBM] (G72.41).

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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 359.79 (other inflammatory and immune myopathies, NEC).