Get started free

M66

Non-billable

Spontaneous 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

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

What is ICD-10 code M66?
M66 is the ICD-10-CM code for "Spontaneous rupture of synovium and tendon". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M66 a billable code?
No — M66 is a non-billable header code. Use a more specific child code (such as M66.0) for billing.
What are the subcodes of M66?
M66 has 6 more specific child codes, including M66.0, M66.1, M66.2.

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

Powered by Eleplan

Free ICD-10 lookup is just the start. Eleplan keeps the whole care plan in one place.

Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, with Ellie, your AI care assistant, on top of it. Free to start.

Get started freeSee how Eleplan works →