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M40.3

Non-billable

Flatback syndrome

M40.3 is the ICD-10-CM code for Flatback syndrome. It is a non-billable category code — use a more specific child code such as M40.30 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Parent
M40
Subcodes
4
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code M40.3?
M40.3 is the ICD-10-CM code for "Flatback syndrome". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M40.3 a billable code?
No — M40.3 is a non-billable header code. Use a more specific child code (such as M40.30) for billing.
What are the subcodes of M40.3?
M40.3 has 4 more specific child codes, including M40.30, M40.35, M40.36.

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

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