Homonymous bilateral field defects, right side

This code describes a specific type of visual field defect where the same half of the visual field is lost in both eyes, affecting the right side. This condition typically results from a lesion in the retrochiasmal visual pathway, such as a stroke or tumor, impacting the optic tracts, lateral geniculate nucleus, or optic radiations. Patients experience difficulty seeing objects to their right in both their right and left eyes.

Use this code when documentation clearly indicates a homonymous hemianopsia or quadrantanopsia affecting the right visual field in both eyes. This diagnosis is typically established through formal visual field testing (e.g., perimetry) and neurological examination. Supporting documentation should specify the laterality of the defect as "right side."

• Ensure documentation specifies "homonymous" and "right side" to accurately assign this code.
• Distinguish from other visual field defects, such as bitemporal hemianopsia or monocular field defects.
• Always code the underlying cause of the field defect (e.g., stroke, tumor) first, as this code represents a manifestation.