Is M40.3 a billable code?
No. M40.3 is a header code that groups 4 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
M40.3: Flatback syndrome
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
M40.3 groups related diagnoses under flatback syndrome. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under M40.3
M40.3 questions
What does M40.3 mean?
M40.3 is the ICD-10-CM code for Flatback syndrome. It is in chapter 13, Diseases of the musculoskeletal system and connective tissue (M00-M99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.