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v1.0.0
ICD-10 Guide
DiagnosesOpen Angle Glaucoma

Open Angle Glaucoma

ICD-10 Coding for Open-Angle Glaucoma(H40.1111, H40.1133)

PRIMARY SPECIALTYOphthalmology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Open Angle Glaucoma?
Essential facts and insights about Open-Angle Glaucoma

Key Clinical Considerations:

  • Elevated intraocular pressure (IOP)
  • Optic nerve damage
  • Visual field loss

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history of eye exams and IOP measurements
  • Details of visual field tests and optic nerve assessments
  • Use of specific terms like 'open-angle glaucoma' in documentation

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for distinguishing between unilateral and bilateral cases.
  • Common errors include misclassifying the type of glaucoma or omitting eye involvement.

Code Exclusions

Important Exclusions

  • Angle-closure glaucoma
  • Secondary glaucoma due to other conditions

Related ICD-10 Codes

Primary Codes
H40.11
Primary open-angle glaucoma, right eye
H40.12
Primary open-angle glaucoma, left eye
H40.13
Primary open-angle glaucoma, bilateral
Ancillary Codes
Z79.82
Differential Codes
H40.1211
H40.1233

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Ophthalmology

Specialty Applications

  • Adults over 40 years old, especially those with family history of glaucoma
  • Ophthalmology clinics and general practice settings

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Include IOP readings, visual field test results, and optic nerve assessment.

Billing considerations?

Ensure correct ICD codes are used based on eye involvement and severity.