M66.51 ICD-10-CA code: Spontaneous rupture of unspecified tendon, shoulder region

M66.51 is the ICD-10-CA code for “Spontaneous rupture of unspecified tendon, shoulder region” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

M66.51

Spontaneous rupture of unspecified tendon, shoulder region

Short description: Spont rupture unspec tendon shoulder

ICD-10-CA · Canada · Also written M6651

Notes for M66.51

As CIHI prints them, with any note M66.51 takes from the headings above it.

Includes

Rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strengthFrom M66 Spontaneous rupture of synovium and tendon

Excludes

Conditions classified elsewhere.

Rotator cuff syndrome (M75.1)rupture where an abnormal force is applied to normal tissue - see injury of tendon by body regionFrom M66 Spontaneous rupture of synovium and tendon
Certain:• conditions originating in the perinatal period (P00-P96)• disorders of the temporomandibular joint (K07.6)• infectious and parasitic diseases (A00-B99)compartment syndrome (T79.6)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)

Note

[To review the anatomical site captured in the 5th character subclassification see Chapter XIII]From M66.5 Spontaneous rupture of unspecified tendon
The following fifth characters represent the following sites of involvement:0 Multiple sites1 Shoulder region: clavical , scapula — joint acromioclavicular, glenohumeral, sternoclavicular2 Upper arm: humerus — elbow joint,3 Forearm: radius , ulna — wrist joint,4 Hand: carpus, fingers, metacarpus — joints between these bones,5 Pelvic region and thigh: buttock , femur , pelvis — joint hip , sacroiliac6 Lower leg: fibula , tibia — knee joint7 Ankle and foot: metatarsus, tarsus, toes — other joints in foot8 Other:head neck ribs skull trunk vertebral column9 Site unspecifiedFrom Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)

Where M66.51 sits

1ChapterChapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)
2Block M60-M79Soft tissue disorders
3Block M65-M68Disorders of synovium and tendon
4Category M66Spontaneous rupture of synovium and tendon
5Subcategory M66.5Spontaneous rupture of unspecified tendon
6Valid code M66.51Spontaneous rupture of unspecified tendon, shoulder region

Source and release

Data release: ICD-10-CA · FY 2026–2027
Effective date: Apr 1, 2026
Publisher: CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See M66.51 in the CIHI source

Frequently asked questions

What does ICD-10-CA code M66.51 mean?

M66.51 is the ICD-10-CA code for “Spontaneous rupture of unspecified tendon, shoulder region” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is M66.51 in ICD-10-CA?

M66.51 sits under M66.5 Spontaneous rupture of unspecified tendon, within M66 Spontaneous rupture of synovium and tendon, within M65-M68 Disorders of synovium and tendon, within M60-M79 Soft tissue disorders, within Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99).

What coding notes apply to M66.51?

ICD-10-CA lists Note, Includes, Excludes notes for M66.51, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

View M66.5