Underdosing of antineoplastic and immunosup drugs, sequela

This code indicates a long-term or residual effect resulting from a patient not receiving enough of their prescribed antineoplastic (chemotherapy) or immunosuppressive medications. These sequelae can manifest months or even years after the period of underdosing.

Use this code when documenting conditions that are a direct consequence of historical underdosing of cancer treatments or immune-suppressing drugs. This applies when the underdosing itself is no longer an active issue, but its lasting impact on the patient's health is being addressed. For example, a patient presenting with a recurrence of cancer directly attributed to previous underdosing of chemotherapy.

• Always sequence this code after the code for the specific condition or disease that is a sequela of the underdosing.
• Ensure documentation clearly links the current condition to a past instance of underdosing of antineoplastic or immunosuppressive drugs.
• Do not use for active underdosing; that would require a different 7th character.