Abnormal electro-oculogram [EOG]

This code indicates an abnormal result from an electro-oculogram (EOG) test. An EOG measures the standing potential of the retina, reflecting the function of the retinal pigment epithelium (RPE) and photoreceptors. Abnormalities suggest dysfunction in these structures, often associated with various retinal diseases.

Use this code when the EOG test report explicitly states an abnormal finding. This is typically seen in the workup for suspected retinal dystrophies, such as Best's vitelliform macular dystrophy, or other conditions affecting RPE function. Documentation should clearly state the EOG results and the physician's interpretation of them as abnormal.

• Do not use this code for normal EOG results; there is no specific code for a normal finding.
• This code represents the finding of an abnormal EOG, not the underlying condition causing it. Always code the definitive diagnosis if known.
• Ensure the medical record contains a formal EOG report with the interpretation of "abnormal" or specific findings indicating abnormality.