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2025 ICD-10-CM code H40.839

Aqueous misdirection of an unspecified eye.

Refer to the official ICD-10-CM coding guidelines for proper code assignment and reporting. Be sure to differentiate between unspecified, right, left, or bilateral manifestations.

Medical necessity for treatment is established by the presence of signs and symptoms of aqueous misdirection, along with elevated intraocular pressure that poses a risk to the patient's vision. The documentation should support the need for interventions aimed at lowering intraocular pressure and preventing optic nerve damage.

Diagnosis and management of this condition falls under the purview of ophthalmologists, who specialize in eye diseases and treatment.

In simple words: This code refers to a specific type of glaucoma called aqueous misdirection, affecting an unspecified eye.In this condition, the fluid inside the eye doesn't circulate correctly, causing pressure buildup.

Aqueous misdirection, unspecified eye. This condition involves the displacement of aqueous humor, leading to increased pressure within the eye.

Example 1: A patient presents with symptoms of acute angle-closure glaucoma, such as blurred vision, eye pain, and halos around lights. Upon examination, aqueous misdirection is diagnosed in the left eye., A patient with a history of plateau iris configuration develops elevated intraocular pressure and is subsequently diagnosed with aqueous misdirection in the right eye., During a routine eye examination, a patient is found to have increased intraocular pressure, narrow angles, and other signs consistent with aqueous misdirection in both eyes.

Documentation should include details of the patient's symptoms, ophthalmic examination findings (including intraocular pressure measurements, gonioscopy results, and assessment of the optic nerve), and any relevant imaging studies.The laterality (which eye is affected) must be clearly specified.

** Excludes1: absolute glaucoma (H44.51-) and congenital glaucoma (Q15.0).If applicable, an external cause code should be used following this code to identify the underlying cause of the aqueous misdirection.For example, if trauma caused the condition, an appropriate 'S' code would be added.

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