ICD10BillableValid for clinical use
ICD-10 Code H40.9: Unspecified glaucoma
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the eye and adnexa (H00-H59).
When is it used?
- May be used when a clinician documents unspecified glaucoma in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
7Diseases of the eye and adnexa (H00-H59)
block
H40-H42Glaucoma
category
H40Glaucoma
currentH40
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
Ophthalmologist
Related codes
H40.0Glaucoma suspectcategoryH40.1Open-angle glaucomacategoryH40.2Primary angle-closure glaucomacategoryH40.3Glaucoma secondary to eye traumacategoryH40.4Glaucoma secondary to eye inflammationcategoryH40.5Glaucoma secondary to other eye disorderscategoryH40.6Glaucoma secondary to drugscategoryH40.8Other glaucomacategory
Sibling codes
Coverage-related procedures and services
CPT 66988high
EXTRACAPSULAR CATARACT REMOVAL WITH INSERTION OF INTRAOCULAR LENS PROSTHESIS (1 STAGE PROCEDURE), MANUAL OR MECHANICAL TECHNIQUE (EG, IRRIGATION AND ASPIRATION OR PHACOEMULSIFICATION); WITH ENDOSCOPIC CYCLOPHOTOCOAGULATION
Source: CMS coverage guidance
CPT 66984high
EXTRACAPSULAR CATARACT REMOVAL WITH INSERTION OF INTRAOCULAR LENS PROSTHESIS (1 STAGE PROCEDURE), MANUAL OR MECHANICAL TECHNIQUE (EG, IRRIGATION AND ASPIRATION OR PHACOEMULSIFICATION); WITHOUT ENDOSCOPIC CYCLOPHOTOCOAGULATION
Source: CMS coverage guidance
CPT 92250high
FUNDUS PHOTOGRAPHY WITH INTERPRETATION AND REPORT
Source: CMS coverage guidance
CPT 92227high
IMAGING OF RETINA FOR DETECTION OR MONITORING OF DISEASE; WITH REMOTE CLINICAL STAFF REVIEW AND REPORT, UNILATERAL OR BILATERAL
Source: CMS coverage guidance
CPT 92228high
IMAGING OF RETINA FOR DETECTION OR MONITORING OF DISEASE; WITH REMOTE PHYSICIAN OR OTHER QUALIFIED HEALTH CARE PROFESSIONAL INTERPRETATION AND REPORT, UNILATERAL OR BILATERAL
Source: CMS coverage guidance
CPT 66983high
INTRACAPSULAR CATARACT EXTRACTION WITH INSERTION OF INTRAOCULAR LENS PROSTHESIS (1 STAGE PROCEDURE)
Source: CMS coverage guidance
Mapped diagnoses and classifications
SNOMED_CT 1304240002high
Bilateral glaucoma
Source: SNOMED International ICD-10 map
SNOMED_CT 23986001high
Glaucoma
Source: SNOMED International ICD-10 map
SNOMED_CT 719976001high
Glaucoma and sleep apnea syndrome
Source: SNOMED International ICD-10 map
SNOMED_CT 12239461000119106high
Glaucoma of left eye
Source: SNOMED International ICD-10 map
SNOMED_CT 12239501000119106high
Glaucoma of right eye
Source: SNOMED International ICD-10 map
SNOMED_CT 232087009high
Glaucoma with intraocular hemorrhage
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
H40.9
Common synonyms
Unspecified glaucoma
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.