Underdosing of diagnostic agents, subsequent encounter

This code indicates that a patient experienced an adverse effect or complication because they received an insufficient amount of a diagnostic agent during a previous encounter. This underdosing led to a suboptimal diagnostic procedure or an inaccurate result, and the patient is now being seen for follow-up care related to this issue.

Use this code when documenting a patient's visit for ongoing management or treatment of a condition that arose due to an underdosed diagnostic agent. This often applies when a diagnostic test (e.g., imaging with contrast, certain lab tests) was ineffective or misleading because too little of the agent was administered, and the patient is returning for further evaluation or correction.

• Always sequence this code after the code for the specific adverse effect or complication.
• Ensure documentation clearly links the patient's current condition to the underdosing of the diagnostic agent.
• This "D" seventh character indicates a subsequent encounter, meaning the patient is receiving routine care during the healing or recovery phase.