ICD-10-CM 2027 diagnosis code
M40.4Postural lordosis
M40.4 is a header code, so it can't be reported by itself. Choose one of the 4 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 M40.4
M40.4 is the ICD-10-CM diagnosis code for postural lordosis. It belongs to category M40 (kyphosis and lordosis), 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 4 subcodes must be used instead.
Within M40 (kyphosis and lordosis), M40.4 is specifically for postural lordosis. Related codes cover postural kyphosis (M40.0), other secondary kyphosis (M40.1), other and unspecified kyphosis (M40.2), Flatback syndrome (M40.3) and lordosis, unspecified (M40.5).
To report this condition, pick the subcode that matches the documentation: M40.40 (site unspecified), M40.45 (thoracolumbar region), M40.46 (lumbar region) and M40.47 (lumbosacral region).
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 M40.4
Coding notes
- Acquired lordosis
Notes that apply from higher levels
Instructions written at a parent level also apply to M40.4.
› From M40 Kyphosis and lordosis
Broader instructions also apply from Chapter 13: Diseases of the musculoskeletal system and connective tissue.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 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 M40.4
Is M40.4 billable?
- No. M40.4 is a header code. Report one of its more specific subcodes instead.