M66
Non-billableSpontaneous rupture of synovium and tendon
M66 is the ICD-10-CM code for Spontaneous rupture of synovium and tendon. It is a non-billable category code — use a more specific child code such as M66.0 for billing.
- Status
- Header (non-billable)
- Chapter
- M00-M99
- Subcodes
- 6
- Edition
- FY2026
M00-M99 Diseases of the musculoskeletal system and connective tissue
What this means — in plain language
MedlinePlus · NIHWhat are joints? Your joints are places where two or more bones come together. Your shoulders, elbows, hips, knees, and knuckles are all joints. Your spine has joints, too. But joints are more than bones. They include the soft tissues around them, such as cartilage, tendons and ligaments. Cartilage is the hard slippery flexible tissue that covers the ends of your bones at a joint. Tendons are tough, flexible bands…
Read more about Joint Disorders at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Includes
- •rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength
Excludes2 — not included here
- •rotator cuff syndrome (M75.1-)
- •rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
Look up another ICD-10 code or condition