Glaucoma secondary to oth eye disord, left eye, stage unsp

This code signifies elevated intraocular pressure and optic nerve damage in the left eye, where the glaucoma is a direct consequence of another pre-existing ocular condition. The specific stage of glaucoma progression is not documented or determined.

Apply this code when documentation clearly states "secondary glaucoma" in the left eye due to an underlying eye disorder (e.g., uveitis, intraocular tumor, retinal detachment) and the stage of glaucoma is not specified. This code is appropriate when the primary cause of the glaucoma is another eye condition, not systemic disease or trauma.

• Always sequence the underlying eye disorder causing the glaucoma first, if known and documented.
• Avoid using this code if the documentation specifies a particular stage of glaucoma (e.g., mild, moderate, severe); instead, select a more specific H40.52X_ code.
• Differentiate from H40.4 (Glaucoma secondary to eye trauma) and H40.6 (Glaucoma secondary to drugs or other medical conditions) based on the etiology.