M05.161 Rheumatoid lung disease with rheumatoid arthritis of right knee

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 M05.161

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

• M05.15 Rheumatoid lung disease with rheumatoid arthritis of hip
• M05.151 Rheumatoid lung disease with rheumatoid arthritis of right hip
• M05.152 Rheumatoid lung disease with rheumatoid arthritis of left hip
• M05.159 Rheumatoid lung disease with rheumatoid arthritis of unspecified hip
• M05.16 Rheumatoid lung disease with rheumatoid arthritis of knee
• M05.161 Rheumatoid lung disease with rheumatoid arthritis of right knee (this code)
• 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