Glaucoma Awareness Month Guide to Glaucoma ICD 10 Coding
Glaucoma Awareness Month guide to accurate glaucoma ICD 10 coding, documentation tips, and billing practices to reduce claim denials.

The Glaucoma Awareness Month, which is held in January every year, acts as a much needed wake-up call on the need to detect and treat glaucoma early before it affects an individual sight. In the case of medical billing specialists and medical practitioners, proper coding of glaucoma ICD 10 is fundamental to proper reimbursement as well as monitoring the incidences of the disease and quality care of patients. This is an easy to follow guide that will assist in getting lost in the mazes of the glaucoma ICD 10 codes making sure that you are precise in your medical billing practices.
Understanding Glaucoma and Its Impact
Glaucoma is a category of eye diseases that destroy the optic nerve, mostly because of the elevated intraocular pressure. Being the second most common cause of blindness in the world, glaucoma has millions of sufferers in America with many not being diagnosed until serious cases of blindness are detected. The disease mostly comes about slowly and thus frequent eye checkups and good documentation is very important in handling the disease.
Medical billing specialists should be aware that glaucoma has different types, each of which should be specified with the help of the ICD 10 codes. Appropriate coding guarantees the correct treatment processing of claims, minimized denials, and proper planning of treatment. Coding accuracy is especially warranted during the Glaucoma Awareness Month when healthcare facilities are likely to receive more patients regarding screenings.
Overview of Glaucoma ICD 10 Code Structure
ICD-10-CM coding system has a H40 code under which the glaucoma ICD 10 codes are classified. These codes give comprehensive data concerning the type of glaucoma, the affected eye( right, left or bilateral) and the level of the disease. This structure is highly essential to comprehend in order to bill properly.
Primary Open-Angle Glaucoma ICD 10 Codes
Primary open-angle glaucoma (POAG) is the most common form of the disease, characterized by gradual drainage system blockage that increases eye pressure. This type accounts for approximately 90% of all glaucoma cases in the United States.
Primary Open-Angle Glaucoma Codes
| ICD-10 Code | Description |
|---|---|
| H40.1111 | Primary open-angle glaucoma, right eye, mild stage |
| H40.1112 | Primary open-angle glaucoma, right eye, moderate stage |
| H40.1113 | Primary open-angle glaucoma, right eye, severe stage |
| H40.1114 | Primary open-angle glaucoma, right eye, indeterminate stage |
| H40.1121 | Primary open-angle glaucoma, left eye, mild stage |
| H40.1122 | Primary open-angle glaucoma, left eye, moderate stage |
| H40.1123 | Primary open-angle glaucoma, left eye, severe stage |
| H40.1124 | Primary open-angle glaucoma, left eye, indeterminate stage |
| H40.1131 | Primary open-angle glaucoma, bilateral, mild stage |
Angle-Closure Glaucoma ICD 10 Codes
Angle-closure glaucoma occurs when the iris blocks the drainage angle, causing a rapid increase in eye pressure. This type requires immediate medical attention and different coding than open-angle variants.
Acute Angle-Closure Glaucoma Codes
| ICD-10 Code | Description |
|---|---|
| H40.211 | Acute angle-closure glaucoma, right eye |
| H40.212 | Acute angle-closure glaucoma, left eye |
| H40.213 | Acute angle-closure glaucoma, bilateral |
| H40.219 | Acute angle-closure glaucoma, unspecified eye |
Chronic Angle-Closure Glaucoma Codes
| ICD-10 Code | Description |
|---|---|
| H40.2211 | Chronic angle-closure glaucoma, right eye, mild stage |
| H40.2212 | Chronic angle-closure glaucoma, right eye, moderate stage |
| H40.2213 | Chronic angle-closure glaucoma, right eye, severe stage |
| H40.2214 | Chronic angle-closure glaucoma, right eye, indeterminate stage |
| H40.2221 | Chronic angle-closure glaucoma, left eye, mild stage |
| H40.2222 | Chronic angle-closure glaucoma, left eye, moderate stage |
| H40.2223 | Chronic angle-closure glaucoma, left eye, severe stage |
| H40.2224 | Chronic angle-closure glaucoma, left eye, indeterminate stage |
| H40.2231 | Chronic angle-closure glaucoma, bilateral, mild stage |
Secondary Glaucoma Due to Other Eye Disorders
| ICD-10 Code | Description |
|---|---|
| H40.31X1 | Glaucoma secondary to eye trauma, right eye, mild stage |
| H40.31X2 | Glaucoma secondary to eye trauma, right eye, moderate stage |
| H40.31X3 | Glaucoma secondary to eye trauma, right eye, severe stage |
| H40.32X1 | Glaucoma secondary to eye trauma, left eye, mild stage |
| H40.32X2 | Glaucoma secondary to eye trauma, left eye, moderate stage |
| H40.32X3 | Glaucoma secondary to eye trauma, left eye, severe stage |
| H40.33X1 | Glaucoma secondary to eye trauma, bilateral, mild stage |
| H40.33X2 | Glaucoma secondary to eye trauma, bilateral, moderate stage |
| H40.33X3 | Glaucoma secondary to eye trauma, bilateral, severe stage |
Best Practices: Glaucoma ICD 10 Coding.
The ICD 10 code of glaucoma involves paying attention to details and reviewing the documentation. The medical billers are always expected to ensure that before codes are assigned the specifics of the type of glaucoma, affected eye and the stage of the disease should be revealed through the clinical notes.
Checking the documentation, make sure that the physician has distinctly described the stage of glaucoma on the basis of the visual field testing and the examination of the optic nerve. In case of the absence of staging information, contact the provider to provide claims prior to submissions. The problem of using unspecified codes when more specific details are given may result in the refusal of claims and decreased payment.
Glaucoma ICD 10 codes should always be related to relevant CPT codes of examinations, diagnostic tests and treatment. Routine tests are visual field testing (92081-92083), optic nerve imaging (92133-92134), and other surgical operations. Clean claims and quick reimbursement is provided through proper code linking.
Documentation Requirements for Glaucoma Coding
The basis of proper glaucoma ICD 10 coding is thorough documentation. The type of glaucoma and laterality (right, left or bilateral) and stage should be recorded by the physicians according to the objective findings. The results of the visual field, cup-to-disc ratio of the optic nerve, and the intraocular pressure should be well documented in the medical record.
In case of secondary glaucoma, the documentation should determine the cause behind it being trauma, medication, inflammation, or any other eye disorder. The information is crucial in choosing the appropriate secondary code of glaucoma and may need further diagnosis codes of the causative condition.
In case a disease progression has been noted, the change in the stage should be documented with clinical evidence. Periodic tracking and recording of glaucoma progression is the rational basis of continued treatment and prevents disqualification due to medical necessity questions.
Common Coding Errors to Avoid
Among the common mistakes made in coding glaucoma ICD 10 is the use of unspecified codes in cases where there is specific information. Codes with a code of nine at the end, unspecified eye; and a code of zero at the end, unspecified stage, should be only applied when the documentation really has no such information. Excessive use of non-specific codes will cause audit and loss of rate of reimbursement.
The other error is the inappropriate laterality coding. It is imperative that billers should differentiate well between unilateral and bilateral cases because the application of a bilateral code to one eye only (or the opposite) is inaccurate coding. The findings of examinations should always be verified of both eyes before codes are assigned.
The inability to revise the codes as the disease advances also brings about coding errors. Glaucoma is progressive and codes must indicate the stage at a point of encounter. The codes that were used in the past may not present a clear picture of the present state of the patient and the treatment requirements.
Glaucoma Awareness Month and Coding Compliance
Awareness campaigns and screening activities help in increasing the number of patients in many practices during the Glaucoma Awareness Month. This increased activity heightens the need for coding compliance even further. The billers are to be ready to review the existing glaucoma ICD 10 codes, to ensure staff training up-to-date and to create quality controls on screening and diagnostic visit coding.
Diagnostic encounters are not similar to screening visits. Coding the glaucoma screenings, along with the findings, include the relevant screening codes (Z13.5 eye and ear disorder screening) as well. In case of glaucoma or glaucoma suspect results after the screening, include the corresponding diagnostic codes to aid in the subsequent treatment.
Use the Glaucoma Awareness Month to review the accuracy of your practice coding of glaucoma. Examine one of the recent glaucoma claims to find the trends of error or documentation lapses. Such a proactive method would help to avoid future refusals and enhance the quality of coding in totality.
Why choose Billing Care Solutions
At Billing Care Solutions, we have realized the intricacies of medical billing involving ophthalmology and the extreme essence of correct glaucoma ICD 10 coding. With our group of qualified medical billing experts, there is a wealth of experience in eye care billing, which means that your practice will get maximum reimbursement and at the same time meet all coding requirements.
We also keep up with all the ICD-10-CM changes and payer-related requirements and offer your practice the skills required to navigate the dynamic healthcare billing environment. Our extensive services cover thorough check up of documentation, proper code assignment, submissions of claims, management of the denials and continuous compliance checking. Our scalable solutions will make sure that your billing processes go on without putting extra pressure on your employees during high-volume times such as the Glaucoma Awareness Month.
Select Billing Care Solutions to have more than the usual billing services.
In collaboration with your practice, we are working together to streamline revenue cycle management, decrease claim denials, and liberate employees to concentrate on outstanding patient care. We are ready to discuss ways our area of specialization, ophthalmology billing, can help your practice.
Conclusion:
Learning of glaucoma ICD 10 is a critical aspect of ophthalmology practices and billing workers. Throughout the year and during the Glaucoma Awareness Month, correct coding will ensure the needed reimbursement, quality patient care, and contribute to the significant data gathering on patient health. Using this knowledge of the different types of glaucoma, their respective codes, and documentation needs, medical billers will be comfortable with this complicated category of coding.
It is important to remember that glaucoma coding involves consideration of three important factors, namely, the type of glaucoma, eye (laterality), and the stage of the disease. Whenever these elements are well documented and coded, claims are easily processed, denials are reduced, and practices can be geared towards what is important to deliver excellent care to the patients at risk of losing their vision.

