M99

Non-billable

Biomechanical lesions, not elsewhere classified

M99 is the ICD-10-CM code for Biomechanical lesions, not elsewhere classified. It is a non-billable category code — use a more specific child code such as M99.0 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Subcodes
10
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

Notes

  • This category should not be used if the condition can be classified elsewhere.

Frequently asked questions

What is ICD-10 code M99?
M99 is the ICD-10-CM code for "Biomechanical lesions, not elsewhere classified". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M99 a billable code?
No — M99 is a non-billable header code. Use a more specific child code (such as M99.0) for billing.
What are the subcodes of M99?
M99 has 10 more specific child codes, including M99.0, M99.1, M99.2.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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