M40.4 – Postural lordosis

ICD-10-CM 2027 diagnosis code · Deforming dorsopathies

Non-billable header

ICD-10-CM code M40.4

Code: M40.4 (claims format: M404)
Description: Postural lordosis
Billable: No – use a more specific code below
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

Billable codes under M40.4

M40.4 is a header code and cannot be used on claims. Choose the most specific code:

M40.40 – Postural lordosis, site unspecifiedBillable
M40.45 – Postural lordosis, thoracolumbar regionBillable
M40.46 – Postural lordosis, lumbar regionBillable
M40.47 – Postural lordosis, lumbosacral regionBillable

Notes for M40.4

Applicable to:

Acquired lordosis

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

Related codes in M40

M40.0 – Postural kyphosisHeader
M40.1 – Other secondary kyphosisHeader
M40.2 – Other and unspecified kyphosisHeader
M40.3 – Flatback syndromeHeader
M40.5 – Lordosis, unspecifiedHeader

Frequently asked questions

What is ICD-10 code M40.4?

M40.4 is the ICD-10-CM code for postural lordosis, in the block M40-M43 (Deforming dorsopathies).

Is M40.4 a billable code?

No. M40.4 is a header code with more specific child codes; report one of the billable codes listed above.

What category does M40.4 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.