ICD10Check
CheckerBrowseOpen

M05.A

✓ Billable

Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis

Diseases of the musculoskeletal system and connective tissue (M00-M99)

Check This Code

📋 Code Instructions

  • • Code first: rheumatoid arthritis with rheumatoid factor by site, if known (M05.00 to M05.8A)

❌ Excludes1

inherited from M05

Rules from parent category M05: Rheumatoid arthritis with rheumatoid factor

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

🧪 Validate Combinations

Add M05.A to the Excludes Checker to validate against your full code list.

Open in Checker →

Code Information

CodeM05.A
BillableYes
ParentM05
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes13 rule(s)
Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)