ICD-10-CM 2027 diagnosis code

M40Kyphosis and lordosis

Not billable — use a more specific code

M40 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M40

M40 is the ICD-10-CM diagnosis code for kyphosis and lordosis. It belongs to block M40-M43 (deforming dorsopathies) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: M40.0 (kyphosis), M40.1 (kyphosis), M40.2 (kyphosis), M40.3 (syndrome), M40.4 (lordosis) and M40.5 (unspecified).

Don't report M40 together with the conditions in its Excludes1 note: congenital kyphosis and lordosis (Q76.4), kyphoscoliosis (M41.-) and postprocedural kyphosis and lordosis (M96.-).

Code first: underlying disease.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under M40

Coding notes

Excludes1Not coded here — never report together with this code

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

Code firstSequence the underlying condition first

underlying disease

Notes that apply from higher levels

Instructions written at a parent level also apply to M40.

Broader instructions also apply from Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Codes whose notes reference M40

M43.8Excludes2
M95Excludes2

Code history

2016
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2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about M40

Is M40 billable?: No. M40 is a header code. Report one of its more specific subcodes instead.