H40.001 Preglaucoma, unspecified, right eye

✓ Billable ICD-10-CM 2026
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The ICD-10-CM code for Preglaucoma, unspecified, right eye is H40.001 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Section
H40-H42: Glaucoma (H40-H42)
Category H40
129 codes (100 billable)
FY2026 Status
Stable since FY2024

U.S. Hospital Utilization

  • An estimated 170 U.S. inpatient stays in 2023 included H40.001 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Glaucoma (TOC entry)

a. Glaucoma .............................................................................................................................. 48

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.7.a
Assigning glaucoma codes (use as many H40 codes as needed)

Assign as many codes from category H40, Glaucoma, as needed to identify the type of glaucoma, the affected eye, and the glaucoma stage.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.7.a.1

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Cite This Page

Reference H40.001 with the canonical source and edition:

H40.001 — Preglaucoma, unspecified, right eye. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/H40.001

Canonical URL: https://icd10codingpro.com/codes/H40.001

Related Codes

Parent Code

H40 Glaucoma

Related Codes in H40

H40 Glaucoma H40.0 Glaucoma suspect H40.00 Preglaucoma, unspecified H40.002 Preglaucoma, unspecified, left eye H40.003 Preglaucoma, unspecified, bilateral H40.009 Preglaucoma, unspecified, unspecified eye H40.01 Open angle with borderline findings, low risk H40.011 Open angle with borderline findings, low risk, right eye H40.012 Open angle with borderline findings, low risk, left eye H40.013 Open angle with borderline findings, low risk, bilateral H40.019 Open angle with borderline findings, low risk, unspecified eye H40.02 Open angle with borderline findings, high risk H40.021 Open angle with borderline findings, high risk, right eye H40.022 Open angle with borderline findings, high risk, left eye H40.023 Open angle with borderline findings, high risk, bilateral H40.029 Open angle with borderline findings, high risk, unspecified eye H40.03 Anatomical narrow angle H40.031 Anatomical narrow angle, right eye H40.032 Anatomical narrow angle, left eye H40.033 Anatomical narrow angle, bilateral
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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