M05.80 – Other rheumatoid arthritis with rheumatoid factor of unspecified site
ICD-10-CM 2027 diagnosis code · Inflammatory polyarthropathies
ICD-10-CM code
M05.80
- Code
M05.80(claims format:M0580)- Description
- Other rheumatoid arthritis with rheumatoid factor of unspecified site
- Short description
- Oth rheumatoid arthritis with rheumatoid factor of unsp site
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
- Block
- M05-M14 Inflammatory polyarthropathies
- Parent codes
- M05 › M05.8
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
M05 – Rheumatoid arthritis with rheumatoid factor
Index terms for M05.80
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in M05.8
- M05.81 – Other rheumatoid arthritis with rheumatoid factor of shoulderHeader
- M05.82 – Other rheumatoid arthritis with rheumatoid factor of elbowHeader
- M05.83 – Other rheumatoid arthritis with rheumatoid factor of wristHeader
- M05.84 – Other rheumatoid arthritis with rheumatoid factor of handHeader
- M05.85 – Other rheumatoid arthritis with rheumatoid factor of hipHeader
- M05.86 – Other rheumatoid arthritis with rheumatoid factor of kneeHeader
- M05.87 – Other rheumatoid arthritis with rheumatoid factor of ankle and footHeader
- M05.89 – Other rheumatoid arthritis with rheumatoid factor of multiple sitesBillable
- M05.8A – Other rheumatoid arthritis with rheumatoid factor of other specified siteBillable
Frequently asked questions
What is ICD-10 code M05.80?
M05.80 is the ICD-10-CM code for other rheumatoid arthritis with rheumatoid factor of unspecified site, in the block M05-M14 (Inflammatory polyarthropathies).
Is M05.80 a billable code?
Yes. M05.80 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does M05.80 belong to?
It belongs to category M05 – Rheumatoid arthritis with rheumatoid factor.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.