H40.20 (Unspecified primary angle-closure glaucoma) is an umbrella ICD-10-CM medical diagnosis code in the Diseases of the eye and adnexa chapter. It identifies cases of unspecified primary angle-closure glaucoma for clinical documentation, billing and epidemiological tracking.

ICD-10-CM · Category

H40.20 — Unspecified primary angle-closure glaucoma

Chapter H00-H59: Diseases of the eye and adnexa

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Related diagnoses

H40.21Acute angle-closure glaucomaH40.22Chronic angle-closure glaucomaH40.23Intermittent angle-closure glaucomaH40.24Residual stage of angle-closure glaucoma

Common questions about H40.20 (Unspecified primary angle-closure glaucoma)

What does ICD-10 code H40.20 mean?
H40.20 is the ICD-10-CM 2025 code for Unspecified primary angle-closure glaucoma. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.
Is H40.20 a billable diagnosis code?
H40.20 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under H40.20. Browse the sub-codes listed on this page.
Which ICD-10 chapter does H40.20 belong to?
H40.20 belongs to the chapter "Diseases of the eye and adnexa" (codes H00-H59). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.
Where can I get plain-language information about Unspecified primary angle-closure glaucoma?
For a plain-language explanation of Unspecified primary angle-closure glaucoma, ask GoDavaii's Health AI - it explains medical conditions in 22+ Indian languages, free, with no signup. Tap "Ask GoDavaii AI about Unspecified primary angle-closure glaucoma" above to get a personalised answer.

Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗