M05.179 Rheumatoid lung disease with rheumatoid arthritis of unspecified ankle and foot

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.-)

Applies from M05.17 Rheumatoid lung disease with rheumatoid arthritis of ankle and foot

Applicable to

• Rheumatoid lung disease with rheumatoid arthritis, tarsus, metatarsus and phalanges

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 M05.179

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

• M05.162 Rheumatoid lung disease with rheumatoid arthritis of left knee
• M05.169 Rheumatoid lung disease with rheumatoid arthritis of unspecified knee
• M05.17 Rheumatoid lung disease with rheumatoid arthritis of ankle and foot
• M05.171 Rheumatoid lung disease with rheumatoid arthritis of right ankle and foot
• M05.172 Rheumatoid lung disease with rheumatoid arthritis of left ankle and foot
• M05.179 Rheumatoid lung disease with rheumatoid arthritis of unspecified ankle and foot (this code)
• M05.19 Rheumatoid lung disease with rheumatoid arthritis of multiple sites
• M05.2 Rheumatoid vasculitis with rheumatoid arthritis
• M05.20 Rheumatoid vasculitis with rheumatoid arthritis of unspecified site
• M05.21 Rheumatoid vasculitis with rheumatoid arthritis of shoulder
• M05.211 Rheumatoid vasculitis with rheumatoid arthritis of right shoulder