ICD-10-CM 2027
ICD-10 code for arm swelling
From the official ICD-10-CM alphabetic index entry “Swelling (of) › arm”. Page updated September 29, 2026.
About coding arm swelling
The ICD-10-CM code for arm swelling is M79.89 (Other specified soft tissue disorders). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on M79.89.
Within M79.8, choose M79.89 (Other specified soft tissue disorders) only when documentation doesn't support a more specific option: nontraumatic hematoma of soft tissue (M79.81).
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 555 (Signs and Symptoms of Musculoskeletal System and Connective Tissue with MCC, relative weight 1.2913) and DRG 556 (Signs and Symptoms of Musculoskeletal System and Connective Tissue without MCC, relative weight 0.8211), 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.
More specific arm swelling codes (official index)
- forearm M79.89 — Other specified soft tissue disorders
Common questions about arm swelling ICD-10 codes
What is the ICD-10 code for arm swelling?
- M79.89 — Other specified soft tissue disorders. More specific codes apply when the documentation supports them: M79.89.
What is the ICD-10 code for forearm arm swelling?
- M79.89 — Other specified soft tissue disorders.
Is M79.89 billable?
- Yes. M79.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M79.89 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M79.89 as a principal diagnosis.
Is M79.89 a CC or MCC?
- No. M79.89 is neither a CC nor an MCC under MS-DRG v44.0.