Retained (old) magnetic fb in ant chamber, left eye

This code signifies the presence of a magnetic foreign body, which has been in the anterior chamber of the left eye for an extended period, indicating it is not a recent injury. The anterior chamber is the fluid-filled space between the cornea and the iris. The magnetic nature of the foreign body is a key characteristic.

Apply this code when documentation clearly states a magnetic foreign body is present in the anterior chamber of the left eye and specifies it is "retained" or "old." This typically occurs after an initial injury where the foreign body was not immediately removed or was overlooked. Supporting documentation would include imaging reports (e.g., MRI, X-ray) confirming the foreign body's location and magnetic properties, as well as physician notes detailing its chronic presence.

• Ensure the documentation specifies "magnetic" and "retained" or "old" to differentiate from acute foreign bodies.
• Verify the laterality is explicitly stated as "left eye."
• Do not confuse with non-magnetic foreign bodies or those in other ocular structures (e.g., vitreous body, lens).