M99.0 – Segmental and somatic dysfunction
ICD-10-CM 2027 diagnosis code · Biomechanical lesions, not elsewhere classified (M99)
- Code
M99.0(claims format:M990)- Description
- Segmental and somatic dysfunction
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
- Block
- M99 Biomechanical lesions, not elsewhere classified (M99)
- Parent codes
- M99
Billable codes under M99.0
M99.0 is a header code and cannot be used on claims. Choose the most specific code:
- M99.00 – Segmental and somatic dysfunction of head regionBillable
- M99.01 – Segmental and somatic dysfunction of cervical regionBillable
- M99.02 – Segmental and somatic dysfunction of thoracic regionBillable
- M99.03 – Segmental and somatic dysfunction of lumbar regionBillable
- M99.04 – Segmental and somatic dysfunction of sacral regionBillable
- M99.05 – Segmental and somatic dysfunction of pelvic regionBillable
- M99.06 – Segmental and somatic dysfunction of lower extremityBillable
- M99.07 – Segmental and somatic dysfunction of upper extremityBillable
- M99.08 – Segmental and somatic dysfunction of rib cageBillable
- M99.09 – Segmental and somatic dysfunction of abdomen and other regionsBillable
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
M99 – Biomechanical lesions, not elsewhere classified
- This category should not be used if the condition can be classified elsewhere.
Related codes in M99
- M99.1 – Subluxation complex (vertebral)Header
- M99.2 – Subluxation stenosis of neural canalHeader
- M99.3 – Osseous stenosis of neural canalHeader
- M99.4 – Connective tissue stenosis of neural canalHeader
- M99.5 – Intervertebral disc stenosis of neural canalHeader
- M99.6 – Osseous and subluxation stenosis of intervertebral foraminaHeader
- M99.7 – Connective tissue and disc stenosis of intervertebral foraminaHeader
- M99.8 – Other biomechanical lesionsHeader
- M99.9 – Biomechanical lesion, unspecifiedBillable
Frequently asked questions
What is ICD-10 code M99.0?
M99.0 is the ICD-10-CM code for segmental and somatic dysfunction, in the block M99 (Biomechanical lesions, not elsewhere classified (M99)).
Is M99.0 a billable code?
No. M99.0 is a header code with more specific child codes; report one of the billable codes listed above.
What category does M99.0 belong to?
It belongs to category M99 – Biomechanical lesions, not elsewhere classified.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.