M66.9

Billable

Spontaneous rupture of unspecified tendon

M66.9 is the ICD-10-CM code for Spontaneous rupture of unspecified tendon. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
M00-M99
Parent
M66
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

What this means — in plain language

MedlinePlus · NIH

A sprain is a stretched or torn ligament. Ligaments are tissues that connect bones at a joint. Falling, twisting, or getting hit can all cause a sprain. Ankle and wrist sprains are common. Symptoms include pain, swelling, bruising, and being unable to move your joint. You might feel a pop or tear when the injury happens. A strain is a stretched or torn muscle or tendon. Tendons are tissues that connect muscle to…

Read more about Sprains and Strains at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Includes

  • Rupture at musculotendinous junction, nontraumatic

Frequently asked questions

What is ICD-10 code M66.9?
M66.9 is the ICD-10-CM code for "Spontaneous rupture of unspecified tendon". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M66.9 a billable code?
Yes — M66.9 is a billable, specific ICD-10-CM code valid for reimbursement.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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