2025 ICD-10-CM code H42
(Active) Effective Date: N/A Diseases of the eye and adnexa - Glaucoma 7 Feed
Glaucoma in diseases classified elsewhere. This code is used for glaucoma associated with other conditions.
Medical necessity is established by the diagnosis of both the underlying condition and the glaucoma. The documentation should support the need for treatment and management of both conditions.
The physician is responsible for documenting the underlying condition causing the glaucoma and ensuring both conditions are appropriately treated and managed.
In simple words: This code is used when someone has glaucoma along with another health problem.The other health problem is coded first, and then H42 is used to show that they also have glaucoma.
Glaucoma in diseases classified elsewhere. Code first underlying condition, such as: amyloidosis (E85.-), aniridia (Q13.1), glaucoma (in) diabetes mellitus (E08.39, E09.39, E10.39, E11.39, E13.39), Lowe's syndrome (E72.03), Reiger's anomaly (Q13.81), specified metabolic disorder (E70-E88). Excludes1: glaucoma (in) onchocerciasis (B73.02), glaucoma (in) syphilis (A52.71), glaucoma (in) tuberculous (A18.59).
Example 1: A patient with diabetes develops glaucoma. The diabetes is coded first (e.g., E11.39), followed by H42., A patient with amyloidosis presents with glaucoma. E85.- is coded first, followed by H42., A patient with Lowe's syndrome has glaucoma.E72.03 is coded first, followed by H42.
Documentation should include the type of glaucoma, laterality, affected eye(s), the underlying condition causing the glaucoma, and any associated symptoms or visual field defects.Any medications or treatments should also be documented.
** It is important to differentiate H42 from other glaucoma codes. This code is used specifically when the glaucoma is a manifestation of another underlying condition.
- Specialties:Ophthalmology, Optometry
- Place of Service:Office, Outpatient Hospital, Inpatient Hospital, Telehealth Provided in Patient’s Home, Telehealth Provided Other than in Patient’s Home