M40.35: Flatback syndrome, thoracolumbar region
M40.35 is the billable ICD-10-CM diagnosis code for Flatback syndrome, thoracolumbar region. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code M40.35?
M40.35 is the ICD-10-CM diagnosis code for Flatback syndrome, thoracolumbar region. It belongs to category M40 (Kyphosis and lordosis).
Is M40.35 a billable code?
Yes. M40.35 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does M40.35 belong to?
M40.35 is part of ICD-10-CM category M40 — Kyphosis and lordosis, which has 62 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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