M05.661Billable
Rheumatoid arthritis of right knee with involvement of other organs and systems
Short description: Rheu arthritis of right knee w involv of organs and systems
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue
- Category
- M05
- Effective date
- October 1, 2026
Related codes in category M05
M05Rheumatoid arthritis with rheumatoid factorM05.0Felty's syndromeM05.00Felty's syndrome, unspecified siteYesM05.01Felty's syndrome, shoulderM05.011Felty's syndrome, right shoulderYesM05.012Felty's syndrome, left shoulderYesM05.019Felty's syndrome, unspecified shoulderYesM05.02Felty's syndrome, elbowM05.021Felty's syndrome, right elbowYesM05.022Felty's syndrome, left elbowYesM05.029Felty's syndrome, unspecified elbowYesM05.03Felty's syndrome, wrist
Frequently asked questions
What is ICD-10 code M05.661?
M05.661 is an ICD-10-CM diagnosis code for Rheumatoid arthritis of right knee with involvement of other organs and systems.
Is M05.661 a billable code?
Yes. M05.661 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is M05.661 in?
M05.661 falls under Chapter 13: Diseases of the musculoskeletal system and connective tissue.
When did M05.661 become effective?
M05.661 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to M05.661?
M05.661 belongs to category M05, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.