M99.91Biomechanical lesion, unspecified, cervical region
Code usage status
Primary diagnosis
Not recommended as the primary diagnosis
Apply only when it matches the confirmed diagnosis and the documented clinical record.
Specificity
Complete code in the classification
Use when the diagnosis matches and no exclusion applies.
- Chapter XIII
- musculoskeletal system and connective tissue
- Group M95-M99
- the musculoskeletal system and connective tissue
- Official Vietnamese name
- Tổn thương sinh - cơ học, không xác định, vùng cổ
Related M99 codes
M99
Biomechanical lesions, not elsewhere classified
M99.0
Segmental and somatic dysfunction
M99.00
Segmental and somatic dysfunction, head region
M99.01
Segmental and somatic dysfunction, cervical region
M99.02
Segmental and somatic dysfunction, thoracic region
M99.03
Segmental and somatic dysfunction, lumbar region
M99.04
Segmental and somatic dysfunction, sacral region
M99.05
Segmental and somatic dysfunction, pelvic region
M99.06
Segmental and somatic dysfunction, lower extremity
M99.07
Segmental and somatic dysfunction, upper extremity
M99.08
Segmental and somatic dysfunction, rib cage
M99.09
Segmental and somatic dysfunction, abdomen and other
Clinical record checklist
View coding guide →- Confirm that the code matches the final documented diagnosis.
- Use one primary-diagnosis code and record only relevant additional conditions.
- Review Ministry indicators, inclusions, exclusions and notes.
- Do not infer a diagnosis beyond the clinical record.
2026 regulatory basis
Indicators are taken from columns 24–29 of the classification accompanying Circular 06/2026/TT-BYT, cross-referenced with Decision 1849/QĐ-BYT and Official Dispatch 4059/BYT-BH.
