M99.4 – Connective tissue stenosis of neural canal
ICD-10-CM 2027 diagnosis code · Biomechanical lesions, not elsewhere classified (M99)
- Code
M99.4(claims format:M994)- Description
- Connective tissue stenosis of neural canal
- 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 M99.4
M99.4 is a header code and cannot be used on claims. Choose the most specific code:
- M99.40 – Connective tissue stenosis of neural canal of head regionBillable
- M99.41 – Connective tissue stenosis of neural canal of cervical regionBillable
- M99.42 – Connective tissue stenosis of neural canal of thoracic regionBillable
- M99.43 – Connective tissue stenosis of neural canal of lumbar regionBillable
- M99.44 – Connective tissue stenosis of neural canal of sacral regionBillable
- M99.45 – Connective tissue stenosis of neural canal of pelvic regionBillable
- M99.46 – Connective tissue stenosis of neural canal of lower extremityBillable
- M99.47 – Connective tissue stenosis of neural canal of upper extremityBillable
- M99.48 – Connective tissue stenosis of neural canal of rib cageBillable
- M99.49 – Connective tissue stenosis of neural canal 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
- M99.0 – Segmental and somatic dysfunctionHeader
- M99.1 – Subluxation complex (vertebral)Header
- M99.2 – Subluxation stenosis of neural canalHeader
- M99.3 – Osseous 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 M99.4?
M99.4 is the ICD-10-CM code for connective tissue stenosis of neural canal, in the block M99 (Biomechanical lesions, not elsewhere classified (M99)).
Is M99.4 a billable code?
No. M99.4 is a header code with more specific child codes; report one of the billable codes listed above.
What category does M99.4 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.