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H40.21

⚠ Non-billable (Header)

Acute angle-closure glaucoma

Diseases of the eye and adnexa (H00-H59)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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Also Known As

Acute angle-closure glaucoma attackAcute angle-closure glaucoma crisis

❌ Excludes1

inherited from H40.2

Rules from parent category H40.2: Primary angle-closure glaucoma

  • • aqueous misdirection (H40.83-)
  • • malignant glaucoma (H40.83-)

Child Codes (4)

H40.211Acute angle-closure glaucoma, right eyeH40.212Acute angle-closure glaucoma, left eyeH40.213Acute angle-closure glaucoma, bilateralH40.219Acute angle-closure glaucoma, unspecified eye

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Code Information

CodeH40.21
BillableNo — Header code
ParentH40.2
CategoryDiseases of the eye and adnexa (H00-H59)
Excludes12 rule(s)
Excludes20 note(s)
Child codes4

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)