2026 ICD-10-CM Diagnosis Code H40.1212Low-tension glaucoma, right eye, moderate stage
H40.1212 is a billable ICD-10-CM diagnosis code for low-tension glaucoma, right eye, moderate stage. The 7th character 2 reports moderate stage glaucoma. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Glaucoma.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for H40.1212.
Quality Payment Program MeasuresBilling
Medicare quality measures that can apply when H40.1212 is part of the patient record.
Primary Open-Angle Glaucoma (POAG): Reduction of Intraocular Pressure (IOP) by 20% OR Documentation of a Plan of Care.
High Priority: YES
Measure Type: Outcome
Submission Methods: Claims, Registry
Description: Percentage of patients aged 18 years and older with a diagnosis of primary open-angle glaucoma (POAG) whose glaucoma treatment has not failed (the most recent IOP was reduced by at least 20% from the pre-intervention level) OR if the most recent IOP was not reduced by at least 20% from the pre-intervention level, a plan of care was documented within the 12 month performance period.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Glaucoma
Glaucoma is a group of diseases that can damage the optic nerve of one, or both, of your eyes. This can result in vision loss. There are different types of glaucoma, but the most common type is open-angle glaucoma. Other less common types include angle-closure glaucoma, and congenital glaucoma.
The full article covers:
- What is glaucoma?
- What causes glaucoma?
- What are the symptoms of glaucoma?
- How is glaucoma diagnosed?
- What are the treatments for glaucoma?
- Can glaucoma be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert H40.1212 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About H40.1212Overview
Is H40.1212 (Low-tension glaucoma, right eye) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report low-tension glaucoma, right eye, moderate stage on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character 2 in H40.1212 mean?
The final character 2 reports moderate stage glaucoma, in this case involving the low-tension glaucoma.
Can H40.1212 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because low-tension glaucoma, right eye, moderate stage describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
What is the ICD-9 equivalent of H40.1212?
Under the General Equivalence Mappings, low-tension glaucoma, right eye, moderate stage converts to ICD-9-CM 365.12 (low tension glaucoma) and 365.72 (moderate stage glaucoma). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
