M05.A ICD-10-CM Code: Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis
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.AAbnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where M05.A sits
- 1
Chapter 13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
- 2
Section
Inflammatory polyarthropathies (M05-M14)
- 3
Category M05
Rheumatoid arthritis with rheumatoid factor
- 4
Code 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.A.
Code first
- rheumatoid arthritis with rheumatoid factor by site, if known (M05.00 to M05.8A)
Use additional code
No “use additional code” instruction is listed for M05.A.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for M05.A.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for M05.A.
Transparency
Source and release
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 sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code M05.A mean?
M05.A is the FY 2027 U.S. ICD-10-CM code for “Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis.”
Is M05.A a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, M05.A has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is M05.A located in ICD-10-CM?
M05.A 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.A?
No inclusion terms are listed for M05.A in this reference record. Code-first instructions: rheumatoid arthritis with rheumatoid factor by site, if known (M05.00 to M05.8A). No Excludes1 note is listed. No Excludes2 note is listed.
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