Miosis

This code represents miosis, which is the excessive constriction of the pupil of the eye, resulting in a small pupil. It can be a physiological response to light or certain medications, or a pathological sign of an underlying medical condition affecting the nervous system or eye.

Use this code when documentation explicitly states miosis as a finding. This includes cases of drug-induced miosis, Horner's syndrome (when miosis is the primary documented finding and the specific syndrome code isn't used), or miosis due to inflammatory conditions of the eye. Documentation should clearly indicate the presence of abnormally constricted pupils.

• Do not use this code if the miosis is a normal physiological response to light and not considered pathological.
• Consider if a more specific code for an underlying condition causing the miosis (e.g., Horner's syndrome G90.2) is more appropriate.
• Ensure the medical record clearly distinguishes pathological miosis from normal pupillary constriction.