Question: Our ophthalmologist saw a patient in the hospital who had been admitted by a gastroenterologist for copper poisoning. The ophthalmologist created a treatment plan to alleviate the copper deposits in the patient's lens capsule and diagnosed the patient with chalcosis in both eyes. Which code should we report for the copper toxicity? Illinois Subscriber Answer: Because the ophthalmologist specifically treated the bilateral chalcosis, the best code choice is H44.313 (Chalcosis, bilateral). If you know the details or cause of the copper toxicity, you can report additional codes as secondary or tertiary diagnoses. For instance, you could report T56.4X4 (Toxic effect of copper and its compounds, undetermined) or Z77.018 (Contact with and [suspected] exposure to otherhazardous metals). Only report the additional codes if they are documented in the medical record and confirmed by the physician.