Underdosing of drug aff the autonomic nervous sys, sequela

This code indicates a patient's condition resulting from receiving an insufficient amount of a medication that primarily impacts the autonomic nervous system, where the underdosing event itself is in the past and the patient is now experiencing a long-term consequence. This could involve drugs like anticholinergics, adrenergic agonists/antagonists, or ganglionic blockers. The sequela represents a persistent health problem directly attributable to the previous underdosing.

Use this code when documenting a chronic or residual condition that arose from a past underdosing of an autonomic nervous system drug. This applies when the patient is no longer actively being underdosed but is managing a lasting effect. Examples include persistent dysautonomia or organ dysfunction directly linked to the prior insufficient medication.

• Requires a seventh character "S" to indicate sequela, meaning the residual effect of a past underdosing.
• Always sequence this code after the code(s) for the specific sequela being treated.
• Ensure documentation clearly links the current condition to a historical underdosing of an autonomic nervous system drug.