M05.50 Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified site

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 V22: HCC 75 — Myasthenia Gravis/Myoneural Disorders, Inflammatory and Toxic Neuropathy
• RxHCC V08: HCC 158 — Inflammatory and Toxic Neuropathy
• ESRD V24: HCC 75

MS-DRG index

Defines the logic of DRG(s) 545-547 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 357.1 Polyneuropathy in collagen vascular disease (approximate)
• 714.0 Rheumatoid arthritis (approximate)

Code annotations containing back-references to M05.50

Back-references to M05.5

• Type 1 Excludes: G63 Polyneuropathy in diseases classified elsewhere ("rheumatoid arthritis (M05.5-)")

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.-)")

Diagnosis Index entries for M05.50

• Rheumatoid › polyneuropathy

Nearby codes

• M05.471 Rheumatoid myopathy with rheumatoid arthritis of right ankle and foot
• M05.472 Rheumatoid myopathy with rheumatoid arthritis of left ankle and foot
• M05.479 Rheumatoid myopathy with rheumatoid arthritis of unspecified ankle and foot
• M05.49 Rheumatoid myopathy with rheumatoid arthritis of multiple sites
• M05.5 Rheumatoid polyneuropathy with rheumatoid arthritis
• M05.50 Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified site (this code)
• M05.51 Rheumatoid polyneuropathy with rheumatoid arthritis of shoulder
• M05.511 Rheumatoid polyneuropathy with rheumatoid arthritis of right shoulder
• M05.512 Rheumatoid polyneuropathy with rheumatoid arthritis of left shoulder
• M05.519 Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified shoulder
• M05.52 Rheumatoid polyneuropathy with rheumatoid arthritis of elbow