Underdosing of analeptics and opioid receptor antag, subs

This code signifies a patient's underdosing of medications classified as analeptics or opioid receptor antagonists during a subsequent encounter for treatment. Underdosing implies the patient took less of the prescribed medication than directed, potentially leading to inadequate therapeutic effect or symptom recurrence.

Apply this code when documentation indicates a patient is being seen for complications or ongoing management related to previously identified underdosing of analeptics (e.g., caffeine, modafinil) or opioid receptor antagonists (e.g., naloxone, naltrexone). This is appropriate for follow-up visits where the underdosing is still a relevant clinical issue being addressed.

• Always sequence this code after the primary diagnosis indicating the condition being treated or the complication arising from the underdosing.
• Ensure documentation clearly specifies "underdosing" and identifies the drug class as an analeptic or opioid receptor antagonist.
• The "D" seventh character indicates a subsequent encounter, meaning the patient is receiving routine care during the healing or recovery phase.