NPI Atlas

M40.36 – Flatback syndrome, lumbar region

ICD-10-CM 2027 diagnosis code · Deforming dorsopathies

Billable code

ICD-10-CM code M40.36

Code: M40.36 (claims format: M4036)
Description: Flatback syndrome, lumbar region
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M40-M43 Deforming dorsopathies
Parent codes: M40 › M40.3

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

M40 – Kyphosis and lordosis

Excludes1 (not coded here):

congenital kyphosis and lordosis (Q76.4)
kyphoscoliosis (M41.-)
postprocedural kyphosis and lordosis (M96.-)

Code first:

underlying disease

Index terms for M40.36

Entries in the ICD-10-CM alphabetic index that lead to this code:

Flatback syndrome, lumbar region

Related codes in M40.3

M40.30 – Flatback syndrome, site unspecifiedBillable
M40.35 – Flatback syndrome, thoracolumbar regionBillable
M40.37 – Flatback syndrome, lumbosacral regionBillable

Frequently asked questions

What is ICD-10 code M40.36?

M40.36 is the ICD-10-CM code for flatback syndrome, lumbar region, in the block M40-M43 (Deforming dorsopathies).

Is M40.36 a billable code?

Yes. M40.36 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does M40.36 belong to?

It belongs to category M40 – Kyphosis and lordosis.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.