ICD-10-CM 2027 diagnosis code
M40.5Lordosis, unspecified
M40.5 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 M40.5
M40.5 is the ICD-10-CM diagnosis code for lordosis, unspecified. 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, choose M40.5 (Lordosis, unspecified) only when documentation doesn't support a more specific option: postural kyphosis (M40.0), other secondary kyphosis (M40.1), other and unspecified kyphosis (M40.2), Flatback syndrome (M40.3) and postural lordosis (M40.4).
To report this condition, pick the subcode that matches the documentation: M40.50 (site unspecified), M40.55 (thoracolumbar region), M40.56 (lumbar region) and M40.57 (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 M40.5
Notes that apply from higher levels
Instructions written at a parent level also apply to M40.5.
› 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 M40.5
Is M40.5 billable?
- No. M40.5 is a header code. Report one of its more specific subcodes instead.