Underdosing of cannabis, subsequent encounter

This code signifies a patient experiencing adverse effects or a lack of therapeutic benefit due to receiving an insufficient amount of cannabis, and this is being addressed during a follow-up visit. It indicates that the patient's cannabis dosage was too low to achieve the desired clinical outcome or prevent withdrawal symptoms.

Apply this code when a patient presents for a subsequent visit to manage symptoms related to an inadequate cannabis dosage, such as persistent pain, anxiety, or withdrawal. This includes situations where the initial prescribed dose was ineffective, or the patient self-administered less than the recommended amount.

• Requires a seventh character "D" for subsequent encounter, indicating ongoing care for the underdosing.
• Distinguish from poisoning (T40.711-) or adverse effect (T40.715-) which imply an appropriate dose causing an unwanted reaction.
• Always sequence this code after the primary diagnosis for which cannabis was prescribed (e.g., chronic pain, anxiety).