M66.1Header code — not billable
Rupture of synovium
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue
- Category
- M66
- Effective date
- October 1, 2026
Related codes in category M66
M66Spontaneous rupture of synovium and tendonM66.0Rupture of popliteal cystYesM66.10Rupture of synovium, unspecified jointYesM66.11Rupture of synovium, shoulderM66.111Rupture of synovium, right shoulderYesM66.112Rupture of synovium, left shoulderYesM66.119Rupture of synovium, unspecified shoulderYesM66.12Rupture of synovium, elbowM66.121Rupture of synovium, right elbowYesM66.122Rupture of synovium, left elbowYesM66.129Rupture of synovium, unspecified elbowYesM66.13Rupture of synovium, wrist
Frequently asked questions
What is ICD-10 code M66.1?
M66.1 is an ICD-10-CM diagnosis code for Rupture of synovium.
Is M66.1 a billable code?
No. M66.1 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is M66.1 in?
M66.1 falls under Chapter 13: Diseases of the musculoskeletal system and connective tissue.
When did M66.1 become effective?
M66.1 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to M66.1?
M66.1 belongs to category M66, 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.