ICD-10-CM diagnosis code
M05.671 Rheumatoid arthritis of right ankle and foot with involvement of other organs and systems
- Billable
- Yes, a complete code (FY2026)
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Other codes in M05
211 complete codes in this category.
- M05.651Rheumatoid arthritis of right hip with involvement of other organs and systems
- M05.652Rheumatoid arthritis of left hip with involvement of other organs and systems
- M05.659Rheumatoid arthritis of unspecified hip with involvement of other organs and systems
- M05.661Rheumatoid arthritis of right knee with involvement of other organs and systems
- M05.662Rheumatoid arthritis of left knee with involvement of other organs and systems
- M05.669Rheumatoid arthritis of unspecified knee with involvement of other organs and systems
- M05.671Rheumatoid arthritis of right ankle and foot with involvement of other organs and systems
- M05.672Rheumatoid arthritis of left ankle and foot with involvement of other organs and systems
- M05.679Rheumatoid arthritis of unspecified ankle and foot with involvement of other organs and systems
- M05.69Rheumatoid arthritis of multiple sites with involvement of other organs and systems
- M05.70Rheumatoid arthritis with rheumatoid factor of unspecified site without organ or systems involvement
- M05.711Rheumatoid arthritis with rheumatoid factor of right shoulder without organ or systems involvement
Documentation tips
- Make sure the note supports every element of the title, “Rheumatoid arthritis of right ankle and foot with involvement of other organs and systems”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to M05.
The international WHO ICD-10 also has M05, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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