All ICD10 Codes
M66Not billable, use a more specific code below

Spontaneous rupture of synovium and tendon

In Disorders of synovium and tendon (M65-M67), chapter 13: Diseases of the Musculoskeletal System and Connective Tissue

103 billable codes under M66: none are a CC or MCC; none map to an HCC.

Advertisements

Instructional notes

Includes: conditions that are coded here

  • rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength

Excludes2: not included here, code separately if applicable

  • rotator cuff syndrome (M75.1-)
  • rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers site and laterality, acute injury versus chronic musculoskeletal conditions, 7th characters for pathologic fractures, osteoporosis with or without current fracture, and multisystem inflammatory syndrome.

Read Section I.C.13 (page 60)

All codes under M66

M66 can't be used on a claim. Pick a billable code below; grey headings group them.

M66 MS-DRGs

As the principal diagnosis, all 103 billable codes under M66 group to MS-DRG 557 or 558 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to M66

Notes on these codes point to M66.

  • M62.1 Excludes2: rupture of tendon (M66.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Joint Disorders

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.

Read more about joint disorders on MedlinePlus

Tendinitis

Tendons are flexible bands of tissue that connect muscles to bones. They help your muscles move your bones. Tendinitis is the severe swelling of a tendon.

Read more about tendinitis on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.