ICD-10-CM H40 is the diagnosis code for Glaucoma. This code falls under the section "Glaucoma" within Chapter 7 — Diseases of the eye and adnexa (H00-H59). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as H40. They are mutually exclusive:
Understanding where H40 sits in the ICD-10-CM classification helps ensure proper coding:
No, H40 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
H40 is the ICD-10-CM diagnosis code for "Glaucoma". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
H40 is located in Section H40-H42 — "Glaucoma" within Chapter 7 of the ICD-10-CM Tabular List.
H40 has 9 sub-code(s) that provide more specific detail: H40.0, H40.1, H40.2, H40.3, H40.4 and more.
Use H40 when the patients documented diagnosis matches "Glaucoma" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Glaucoma is H40.
No, H40 is non-billable. Use a more specific sub-code for primary diagnosis billing.
H40 is in Chapter 7 of the ICD-10-CM Tabular List.
Type 1 Excludes for H40 include: absolute glaucoma (H44.51-); congenital glaucoma (Q15.0); traumatic glaucoma due to birth injury (P15.3).
Yes, H40 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.