All ICD10 Codes
M05Not billable, use a more specific code below

Rheumatoid arthritis with rheumatoid factor

In Inflammatory polyarthropathies (M05-M14), chapter 13: Diseases of the Musculoskeletal System and Connective Tissue

211 billable codes under M05: 23 are a CC; all map to HCC 93 (Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

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Instructional notes

Excludes1: not coded here, use a different code

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

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers site and laterality, acute injury versus chronic musculoskeletal conditions, 7th characters for pathologic fractures, osteoporosis with or without current fracture, and multisystem inflammatory syndrome.

Read Section I.C.13 (page 60)

All codes under M05

M05 can't be used on a claim. Pick a billable code below; grey headings group them.

M05 MS-DRGs

As the principal diagnosis, the billable codes under M05 group to MS-DRG 545, 546, 547, 196, 197, or 198 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to M05

Notes on these codes point to M05.

  • I27.21 Code Also: rheumatoid arthritis (M05.-)
  • R76.81 Excludes1: rheumatoid arthritis with rheumatoid factor (M05.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Rheumatoid Arthritis

Rheumatoid arthritis (RA) is a form of arthritis that causes pain, swelling, and stiffness in your joints. RA is an autoimmune disease. Although it is most common in the wrist and fingers, this disease can cause your immune system to attack any joint tissue. The inflammation (swelling) that comes with RA can also affect other body parts. Inflammation could cause medical issues in your eyes, skin, heart, nerves, blood, or lungs.

Read more about rheumatoid arthritis on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.