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ICD-10-CM 2027 diagnosis code

H40.12Low-tension glaucoma

Not billable — use a more specific codeRequires 7th character

H40.12 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it and add the required 7th character.

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 H40.12

H40.12 is the ICD-10-CM diagnosis code for Low-tension glaucoma. It belongs to category H40 (glaucoma), block H40-H42 (glaucoma) and chapter 7 (diseases of the eye and adnexa). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within H40.1 (open-angle glaucoma), H40.12 is specifically for Low-tension glaucoma. Related codes cover unspecified open-angle glaucoma (H40.10), primary open-angle glaucoma (H40.11), pigmentary glaucoma (H40.13), capsular glaucoma with pseudoexfoliation of lens (H40.14) and residual stage of open-angle glaucoma (H40.15).

Codes in this range require a 7th character: 0 for stage unspecified, 1 for mild stage, 2 for moderate stage, 3 for severe stage and 4 for indeterminate stage. Use placeholder "X" characters to fill any empty positions before the 7th character.

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

7th character

One of the following 7th characters is to be assigned to each code in subcategory H40.12 to designate the stage of glaucoma

  • 0stage unspecified
  • 1mild stage
  • 2moderate stage
  • 3severe stage
  • 4indeterminate stage

Notes that apply from higher levels

Instructions written at a parent level also apply to H40.12.

› From H40 Glaucoma
Excludes1
  • absolute glaucoma (H44.51-)
  • congenital glaucoma (Q15.0)
  • traumatic glaucoma due to birth injury (P15.3)

Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to H40.12.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about H40.12

Is H40.12 billable?

No. H40.12 is a header code. Report one of its more specific subcodes instead.