M99
⚠ Non-billable
Biomechanical lesions, not elsewhere classified
ICD-10-CM · FY2026 · Diseases of the Musculoskeletal System and Connective Tissue
Code
M99
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Musculoskeletal System and Connective Tissue
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code M99?
ICD-10-CM code M99 represents Biomechanical lesions, not elsewhere classified. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective October 1, 2025 – September 30, 2026.
Is M99 billable?
No. M99 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is M99 in?
M99 belongs to the Diseases of the Musculoskeletal System and Connective Tissue chapter (M00–M99) of ICD-10-CM.
Related codes in the M99 category
M99.0
Segmental and somatic dysfunction
Non-billable
M99.1
Subluxation complex (vertebral)
Non-billable
M99.2
Subluxation stenosis of neural canal
Non-billable
M99.3
Osseous stenosis of neural canal
Non-billable
M99.4
Connective tissue stenosis of neural canal
Non-billable
M99.00
Segmental and somatic dysfunction of head region
Billable
M99.01
Segmental and somatic dysfunction of cervical region
Billable
M99.02
Segmental and somatic dysfunction of thoracic region
Billable
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