Coding and coverage · ICD-10-CM

H40 Glaucoma

Not billable (header)Chapter 7

Report one of the more specific codes below.

Check coverage with this diagnosis

Codes under this one

  • H40.0 Glaucoma suspectHeader
  • H40.1 Open-angle glaucomaHeader
  • H40.2 Primary angle-closure glaucomaHeader
  • H40.3 Glaucoma secondary to eye traumaHeader
  • H40.4 Glaucoma secondary to eye inflammationHeader
  • H40.5 Glaucoma secondary to other eye disordersHeader
  • H40.6 Glaucoma secondary to drugsHeader
  • H40.8 Other glaucomaHeader
  • H40.9 Unspecified glaucoma

Instructional notes

Chapter 7

Excludes2Not included here: the patient may have both; report both when both are present.
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury (trauma) of eye and orbit (S05.-)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)
Notes
  • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • absolute glaucoma (H44.51-)
  • congenital glaucoma (Q15.0)
  • traumatic glaucoma due to birth injury (P15.3)

Chapter 7: Diseases of the eye and adnexa · H40-H42 Glaucoma (H40-H42)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.