ICD-10-CM Code For Glaucoma: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group H40 includes diagnoses for glaucoma, covering open-angle, angle-closure, congenital, and secondary glaucomas that affect the optic nerve and visual fields. These ICD-10-CM diagnosis codes are used to document clinical scenarios that capture disease severity, laterality, and complications such as glaucoma-related optic neuropathy or elevated intraocular pressure. Accurate coding within the ICD-10-CM H40 group supports proper claim adjudication and complete clinical documentation and appropriate reimbursement.

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ICD-10-CM H40: Glaucoma Overview

The ICD-10-CM H40 group encompasses glaucoma diagnoses that affect the optic nerve and visual field, typically related to increased intraocular pressure and progressive vision loss. These conditions target the ocular system and include primary and secondary glaucomas as well as angle-closure and open-angle variants. Accurate coding matters for appropriate claim processing and to reflect the clinical complexity that influences treatment and follow-up care.

When to Use

Use a code from this group when documenting a confirmed diagnosis of glaucoma or a glaucoma subtype that requires clinical management or monitoring. Codes are applied to capture the specific glaucoma type, presence of complications, and laterality for accurate medical record and billing purposes.

ICD-10-CM Codes

252 rows

ICD-10-CM Code	Description
H40.001	Preglaucoma, unspecified, right eye
H40.002	Preglaucoma, unspecified, left eye
H40.003	Preglaucoma, unspecified, bilateral
H40.009	Preglaucoma, unspecified, unspecified eye
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
H40.021	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
H40.031	Anatomical narrow angle, right eye
H40.032	Anatomical narrow angle, left eye
H40.033	Anatomical narrow angle, bilateral
H40.039	Anatomical narrow angle, unspecified eye
H40.041	Steroid responder, right eye
H40.042	Steroid responder, left eye
H40.043	Steroid responder, bilateral
H40.049	Steroid responder, unspecified eye

Showing 1–20 of 252

DRG Codes

3 rows

DRG Code	Description
123	Neurological Eye Disorders
124	Other Disorders of the Eye with MCC or Thrombolytic Agent
125	Other Disorders of the Eye without MCC

Typical Clinical Scenarios

An elderly patient with progressive peripheral vision loss and difficulty navigating reports gradually worsening visual field constriction during routine ophthalmology follow-up; intraocular pressure is elevated on applanation tonometry and optic nerve assessment reveals cupping consistent with chronic primary open-angle glaucomatous optic neuropathy. A diagnosis from this group is assigned to document the chronic open-angle glaucoma type and laterality for ongoing medical management and monitoring. Typical codes: H40.1191, H40.1291
A middle-aged patient presents to the emergency department with sudden, severe eye pain, headache, nausea, and a markedly decreased visual acuity; exam shows a mid-dilated nonreactive pupil and a markedly shallow anterior chamber, consistent with acute angle-closure glaucoma requiring urgent intervention. A code from this group is used to capture the acute presentation and specify laterality and whether it is incident or recurrent for emergent treatment documentation. Typical codes: H40.2211, H40.2212
A patient with a history of long-standing glaucoma treated with multiple topical agents and prior trabeculectomy is seen for worsening vision and corneal decompensation; the visit documents glaucoma as a contributing comorbidity to the current corneal graft failure and vision loss, requiring coordination of surgical care. A code from this group is used to indicate the type and eye affected as a comorbid chronic condition impacting management. Typical codes: H40.1331, H40.1431

ICD-10-CM Code For Glaucoma In Diseases Classified Elsewhere: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

252 rows

ICD-10-CM Code	Description
H40.001	Preglaucoma, unspecified, right eye
H40.002	Preglaucoma, unspecified, left eye
H40.003	Preglaucoma, unspecified, bilateral
H40.009	Preglaucoma, unspecified, unspecified eye
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
H40.021	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
H40.031	Anatomical narrow angle, right eye
H40.032	Anatomical narrow angle, left eye
H40.033	Anatomical narrow angle, bilateral
H40.039	Anatomical narrow angle, unspecified eye
H40.041	Steroid responder, right eye
H40.042	Steroid responder, left eye
H40.043	Steroid responder, bilateral
H40.049	Steroid responder, unspecified eye

Showing 1–20 of 252

DRG Codes

3 rows

DRG Code	Description
123	Neurological Eye Disorders
124	Other Disorders of the Eye with MCC or Thrombolytic Agent
125	Other Disorders of the Eye without MCC

Typical Clinical Scenarios

An elderly patient with progressive peripheral vision loss and difficulty navigating reports gradually worsening visual field constriction during routine ophthalmology follow-up; intraocular pressure is elevated on applanation tonometry and optic nerve assessment reveals cupping consistent with chronic primary open-angle glaucomatous optic neuropathy. A diagnosis from this group is assigned to document the chronic open-angle glaucoma type and laterality for ongoing medical management and monitoring. Typical codes: H40.1191, H40.1291
A middle-aged patient presents to the emergency department with sudden, severe eye pain, headache, nausea, and a markedly decreased visual acuity; exam shows a mid-dilated nonreactive pupil and a markedly shallow anterior chamber, consistent with acute angle-closure glaucoma requiring urgent intervention. A code from this group is used to capture the acute presentation and specify laterality and whether it is incident or recurrent for emergent treatment documentation. Typical codes: H40.2211, H40.2212
A patient with a history of long-standing glaucoma treated with multiple topical agents and prior trabeculectomy is seen for worsening vision and corneal decompensation; the visit documents glaucoma as a contributing comorbidity to the current corneal graft failure and vision loss, requiring coordination of surgical care. A code from this group is used to indicate the type and eye affected as a comorbid chronic condition impacting management. Typical codes: H40.1331, H40.1431

ICD-10-CM Code For Glaucoma In Diseases Classified Elsewhere: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Glaucoma: Group Overview

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ICD-10-CM H40: Glaucoma Overview

ICD-10-CM Code For Glaucoma: Group Overview

Sign up for ICD-10-CM Code For Glaucoma: Group Overview policy alerts

ICD-10-CM H40: Glaucoma Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

ICD-10-CM Code For Glaucoma: Group Overview

Sign up for ICD-10-CM Code For Glaucoma: Group Overview policy alerts

ICD-10-CM H40: Glaucoma Overview

ICD-10-CM Code For Glaucoma: Group Overview

Sign up for ICD-10-CM Code For Glaucoma: Group Overview policy alerts

ICD-10-CM H40: Glaucoma Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which diagnoses are included in the ICD-10-CM H40 group?

How do H40 codes convey laterality and disease stage?

Which H40 codes represent preglaumcoma and ocular hypertension?

What complications or clinical elements do H40 codes capture that affect coding and reimbursement?

Which related DRGs are associated with glaucoma diagnoses in H40?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which diagnoses are included in the ICD-10-CM H40 group?

How do H40 codes convey laterality and disease stage?

Which H40 codes represent preglaumcoma and ocular hypertension?

What complications or clinical elements do H40 codes capture that affect coding and reimbursement?

Which related DRGs are associated with glaucoma diagnoses in H40?

References