Alphabetic Index FY2027

H40

Glaucoma

FY2027Chapter 7: Diseases of the eye and adnexa/H40–H42 Glaucoma

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

H40 is a non-billable ICD-10-CM code category for glaucoma. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are H40.0 Glaucoma suspect, H40.1 Open-angle glaucoma, H40.2 Primary angle-closure glaucoma, H40.3 Glaucoma secondary to eye trauma and 5 more. Its coding notes include 3 Excludes1 entries and 11 Excludes2 entries.

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

Glaucoma needs the type, the affected eye and the stage. The 7th character 4 (indeterminate) is not the same as 0 (stage not documented).

Guidelines I.C.7.aGlaucoma: type, eye and stageRead the official text

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This code
  • absolute glaucoma (H44.51-)
  • congenital glaucoma (Q15.0)
  • traumatic glaucoma due to birth injury (P15.3)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (11 notes)
Inherited from Chapter 7 Diseases of the eye and adnexa
  • 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

Also from chapter/block level (1 note)
Inherited from Chapter 7 Diseases of the eye and adnexa
  • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition

More specific codes under H40 9