M65.8 ICD-10-CA subcategory: Other synovitis and tenosynovitis
M65.8 isn’t a code on its own. Choose one of the 10 codes beneath it, the one the documentation supports.
Official description
M65.8Other synovitis and tenosynovitis
ICD-10-CA · Canada · Also written M658
Codes in M65.8
M65.8 isn’t a code on its own. Open the code that matches what the note documents.
M65.80Other synovitis and tenosynovitis, multiple sitesM65.81Other synovitis and tenosynovitis, shoulder regionM65.82Other synovitis and tenosynovitis, upper armM65.83Other synovitis and tenosynovitis, forearmM65.84Other synovitis and tenosynovitis, handM65.85Other synovitis and tenosynovitis, pelvic region and thighM65.86Other synovitis and tenosynovitis, lower legM65.87Other synovitis and tenosynovitis, ankle and footM65.88Other synovitis and tenosynovitis, other siteM65.89Other synovitis and tenosynovitis, unspecified siteNotes for M65.8
As CIHI prints them, with any note M65.8 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Chronic crepitant synovitis of hand and wrist (M70.0)current injury - see injury of ligament or tendon by body regionsoft tissue disorders related to use, overuse and pressure (M70.-)From M65 Synovitis and tenosynovitis
- 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]
- 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 M65.8 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 M65Synovitis and tenosynovitis
- 5Subcategory M65.8Other synovitis and tenosynovitis
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.
Frequently asked questions
Is M65.8 a valid ICD-10-CA code?
No. M65.8 (Other synovitis and tenosynovitis) is a subcategory heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 10 codes; record the one the documentation supports.
Where is M65.8 in ICD-10-CA?
M65.8 sits under M65 Synovitis and tenosynovitis, 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 M65.8?
ICD-10-CA lists Note, Excludes notes for M65.8, 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.