H40-H42 ICD-10-CA block: Glaucoma
H40-H42 isn’t a code on its own. Choose one of the 11 codes beneath it, the one the documentation supports.
Official description
H40-H42Glaucoma (H40-H42)
ICD-10-CA · Canada
Codes in H40-H42
H40-H42 isn’t a code on its own. Open the group that matches what the note documents.
Notes for H40-H42
As CIHI prints them, with any note H40-H42 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 7: Diseases of the eye and adnexa (H00-H59)
Where H40-H42 sits
- 1ChapterChapter 7: Diseases of the eye and adnexa (H00-H59)
- 2Block H40-H42Glaucoma
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is H40-H42 a valid ICD-10-CA code?
No. H40-H42 (Glaucoma) is a block heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 11 codes; record the one the documentation supports.
Where is H40-H42 in ICD-10-CA?
H40-H42 sits under Chapter 7: Diseases of the eye and adnexa (H00-H59).
What coding notes apply to H40-H42?
ICD-10-CA lists Excludes notes for H40-H42, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside H40-H42
H00-H06Disorders of eyelid, lacrimal system and orbitH10-H13Disorders of conjunctivaH15-H22Disorders of sclera, cornea, iris and ciliary bodyH25-H28Disorders of lensH30-H36Disorders of choroid and retinaH43-H45Disorders of vitreous body and globeH46-H48Disorders of optic nerve and visual pathwaysH49-H52Disorders of ocular muscles, binocular movement, accommodation and refractionH53-H54Visual disturbances and blindnessH55-H59Other disorders of eye and adnexa