Underdosing of iminostilbenes, subsequent encounter

This code indicates that a patient is experiencing an adverse effect or complication due to receiving an insufficient amount of an iminostilbene medication, such as carbamazepine or oxcarbazepine, during a subsequent encounter for care. Underdosing means the patient did not receive the prescribed or therapeutically effective dose, leading to a recurrence or worsening of the condition the medication was intended to treat.

Use this code when documenting a patient visit where the primary reason for the encounter is related to the ongoing consequences of previously underdosing iminostilbene medication. This often applies when a patient's seizure disorder, neuropathic pain, or bipolar disorder symptoms have returned or worsened because they were not taking enough of their prescribed iminostilbene. This code is appropriate for follow-up visits after the initial underdosing event has been identified.

• Always sequence this code after the code(s) for the specific condition being treated by the iminostilbene (e.g., epilepsy, trigeminal neuralgia).
• Ensure documentation clearly states the patient is experiencing an adverse effect from underdosing and that it's a subsequent encounter.
• Do not use this code for initial encounters where the underdosing is first identified; a different seventh character would be appropriate for the initial encounter.