Is M66.3 a billable code?
No. M66.3 is a header code that groups 24 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
M66.3: Spontaneous rupture of flexor tendons
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
M66.3 groups related diagnoses under spontaneous rupture of flexor tendons. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under M66.3
- M66.30Spontaneous rupture of flexor tendons, unspecified site
- M66.311Spontaneous rupture of flexor tendons, right shoulder
- M66.312Spontaneous rupture of flexor tendons, left shoulder
- M66.319Spontaneous rupture of flexor tendons, unspecified shoulder
- M66.321Spontaneous rupture of flexor tendons, right upper arm
- M66.322Spontaneous rupture of flexor tendons, left upper arm
- M66.329Spontaneous rupture of flexor tendons, unspecified upper arm
- M66.331Spontaneous rupture of flexor tendons, right forearm
- M66.332Spontaneous rupture of flexor tendons, left forearm
- M66.339Spontaneous rupture of flexor tendons, unspecified forearm
- M66.341Spontaneous rupture of flexor tendons, right hand
- M66.342Spontaneous rupture of flexor tendons, left hand
- M66.349Spontaneous rupture of flexor tendons, unspecified hand
- M66.351Spontaneous rupture of flexor tendons, right thigh
- M66.352Spontaneous rupture of flexor tendons, left thigh
- M66.359Spontaneous rupture of flexor tendons, unspecified thigh
- M66.361Spontaneous rupture of flexor tendons, right lower leg
- M66.362Spontaneous rupture of flexor tendons, left lower leg
- M66.369Spontaneous rupture of flexor tendons, unspecified lower leg
- M66.371Spontaneous rupture of flexor tendons, right ankle and foot
- M66.372Spontaneous rupture of flexor tendons, left ankle and foot
- M66.379Spontaneous rupture of flexor tendons, unspecified ankle and foot
- M66.38Spontaneous rupture of flexor tendons, other site
- M66.39Spontaneous rupture of flexor tendons, multiple sites
Other codes in M66 Spontaneous rupture of synovium and tendon
M66.3 questions
What does M66.3 mean?
M66.3 is the ICD-10-CM code for Spontaneous rupture of flexor tendons. It is in chapter 13, Diseases of the musculoskeletal system and connective tissue (M00-M99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.