M05.10Rheumatoid lung disease with rheumatoid arthritis of unspecified site

M05.10 is the ICD-10-CM diagnosis code for rheumatoid lung disease with rheumatoid arthritis of unspecified site. It belongs to category M05 (rheumatoid arthritis with rheumatoid factor), block M05-M14 (inflammatory polyarthropathies) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within M05.1, choose M05.10 (of unspecified site) only when documentation doesn't support a more specific option: of shoulder (M05.11), of elbow (M05.12), of wrist (M05.13), of hand (M05.14), of hip (M05.15), of knee (M05.16), of ankle and foot (M05.17) and of multiple sites (M05.19).

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 196 (Interstitial Lung Disease with MCC, relative weight 1.8336), DRG 197 (Interstitial Lung Disease with CC, relative weight 0.9492) and DRG 198 (Interstitial Lung Disease without CC/MCC, relative weight 0.7259), in MDC 04 (Diseases and Disorders of the Respiratory System), 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 714.81 (rheumatoid lung).