Abnormal results of other function studies of eye

This code signifies abnormal findings from various specialized tests assessing ocular function, excluding electroretinography (ERG) and electro-oculography (EOG). It indicates a deviation from normal physiological responses in tests evaluating aspects like visual fields, color vision, dark adaptation, or contrast sensitivity.

Apply this code when documentation specifies abnormal results from functional eye studies other than ERG or EOG, such as abnormal visual field tests (e.g., perimetry), Ishihara plate abnormalities, or impaired dark adaptation. This code is appropriate when the specific underlying cause of the abnormal function is not yet definitively diagnosed or is not separately coded.

• Do not use this code if a more specific diagnosis for the abnormal finding is available and documented (e.g., glaucoma for visual field defects).
• Always sequence this code after the primary diagnosis or condition necessitating the functional study, if applicable.
• Ensure the medical record clearly states the specific functional study performed and the nature of the abnormal result.