M05.121 Rheumatoid lung disease with rheumatoid arthritis of right elbow

Billable ICD-10-CM code, FY2026.

Applies from M05 Rheumatoid arthritis with rheumatoid factor

Excludes1 (never code together)

• rheumatic fever (I00)
• juvenile rheumatoid arthritis (M08.-)
• rheumatoid arthritis of spine (M45.-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 93 — Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders
• CMS-HCC V22: HCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease
• RxHCC V08: HCC 83 — Rheumatoid Arthritis and Other Inflammatory Polyarthropathy
• ESRD V24: HCC 40

MS-DRG index

Defines the logic of DRG(s) 196-198 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 714.81 Rheumatoid lung (approximate)

Code annotations containing back-references to M05.121

Back-references to M05

• Code Also: I27.21 Secondary pulmonary arterial hypertension ("rheumatoid arthritis (M05.-)")
• Type 1 Excludes: R76.81 Abnormal rheumatoid factor and anti-citrullinated protein antibody without rheumatoid arthritis ("rheumatoid arthritis with rheumatoid factor (M05.-)")

Nearby codes

• M05.11 Rheumatoid lung disease with rheumatoid arthritis of shoulder
• M05.111 Rheumatoid lung disease with rheumatoid arthritis of right shoulder
• M05.112 Rheumatoid lung disease with rheumatoid arthritis of left shoulder
• M05.119 Rheumatoid lung disease with rheumatoid arthritis of unspecified shoulder
• M05.12 Rheumatoid lung disease with rheumatoid arthritis of elbow
• M05.121 Rheumatoid lung disease with rheumatoid arthritis of right elbow (this code)
• M05.122 Rheumatoid lung disease with rheumatoid arthritis of left elbow
• M05.129 Rheumatoid lung disease with rheumatoid arthritis of unspecified elbow
• M05.13 Rheumatoid lung disease with rheumatoid arthritis of wrist
• M05.131 Rheumatoid lung disease with rheumatoid arthritis of right wrist
• M05.132 Rheumatoid lung disease with rheumatoid arthritis of left wrist