U.S. ICD-10-CM · FY 2027

M05 ICD-10-CM Code: Rheumatoid arthritis with rheumatoid factor

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

M05

Rheumatoid arthritis with rheumatoid factor

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where M05 sits

  1. 1

    Chapter 13

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

  2. 2

    Section

    Inflammatory polyarthropathies (M05-M14)

  3. 3

    Category M05

    Rheumatoid arthritis with rheumatoid factor

  4. 4

    Code M05

    Rheumatoid arthritis with rheumatoid factor

More specific choices

Codes under M05

M05 is a non-billable category. Choose the child code that best matches the documented diagnosis.

M05.0

Felty's syndrome

M05.1

Rheumatoid lung disease with rheumatoid arthritis

M05.2

Rheumatoid vasculitis with rheumatoid arthritis

M05.3

Rheumatoid heart disease with rheumatoid arthritis

M05.4

Rheumatoid myopathy with rheumatoid arthritis

M05.5

Rheumatoid polyneuropathy with rheumatoid arthritis

M05.6

Rheumatoid arthritis with involvement of other organs and systems

M05.7

Rheumatoid arthritis with rheumatoid factor without organ or systems involvement

M05.8

Other rheumatoid arthritis with rheumatoid factor

M05.9

Rheumatoid arthritis with rheumatoid factor, unspecified

M05.A

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

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for M05.

Code first

No “code first” instruction is listed for M05.

Use additional code

No “use additional code” instruction is listed for M05.

Excludes1

Conditions that should not be reported together with this code.

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

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for M05.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code M05 mean?

M05 is the FY 2027 U.S. ICD-10-CM code for “Rheumatoid arthritis with rheumatoid factor.”

Is M05 a billable or specific ICD-10-CM code?

No. M05 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is M05 located in ICD-10-CM?

M05 is listed in Chapter 13, Diseases of the musculoskeletal system and connective tissue (M00-M99), within Inflammatory polyarthropathies (M05-M14) (M05–M14), under category M05, Rheumatoid arthritis with rheumatoid factor.

What coding notes are listed for M05?

No inclusion terms are listed for M05 in this reference record. No code-first instruction is listed. Excludes1 notes: rheumatic fever (I00); juvenile rheumatoid arthritis (M08.-); rheumatoid arthritis of spine (M45.-). No Excludes2 note is listed.

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