M99 ICD-10-CA category: Biomechanical lesions, not elsewhere classified
M99 isn’t a code on its own. Choose one of the 69 codes beneath it, the one the documentation supports.
Official description
M99Biomechanical lesions, not elsewhere classified
ICD-10-CA · Canada
Codes in M99
M99 isn’t a code on its own. Open the group that matches what the note documents.
M99.0Segmental and somatic dysfunction (10 codes)M99.1Subluxation complex (vertebral) (6 codes)M99.2Subluxation stenosis of neural canal (6 codes)M99.3Osseous stenosis of neural canal (6 codes)M99.4Connective tissue stenosis of neural canal (6 codes)M99.5Intervertebral disc stenosis of neural canal (5 codes)M99.6Osseous and subluxation stenosis of intervertebral foramina (5 codes)M99.7Connective tissue and disc stenosis of intervertebral foramina (5 codes)M99.8Other biomechanical lesions (10 codes)M99.9Biomechanical lesion, unspecified (10 codes)Notes for M99
As CIHI prints them, with any note M99 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- 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
- This category should not be used if the condition can be classified elsewhere.The following fifth characters represent the following sites of involvement:0 Head region occipitocervical1 Cervical region cervicothoracic2 Thoracic region thoracolumbar3 Lumbar region lumbosacral4 Sacral region sacrococcygeal, sacroiliac5 Pelvic region hip, pubic6 Lower extremity7 Upper extremity acromioclavicular,sternoclavicular8 Rib cage costochondral, costovertebral, sternochondral9 Abdomen and other
- 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 M99 sits
- 1ChapterChapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)
- 2Block M95-M99Other disorders of the musculoskeletal system and connective tissue
- 3Category M99Biomechanical lesions, not elsewhere classified
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 M99 a valid ICD-10-CA code?
No. M99 (Biomechanical lesions, not elsewhere classified) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 69 codes; record the one the documentation supports.
Where is M99 in ICD-10-CA?
M99 sits under M95-M99 Other disorders of the musculoskeletal system and connective tissue, within Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99).
What coding notes apply to M99?
ICD-10-CA lists Note, Excludes notes for M99, 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.