Adverse effect of peripheral vasodilators, initial encounter

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of a peripheral vasodilator medication. These adverse effects are not due to an overdose or poisoning, but rather an unexpected or exaggerated response to a standard dose of the drug. The "initial encounter" designation indicates that the patient is receiving active treatment for the adverse effect.

This code is appropriate when a patient presents with symptoms such as hypotension, dizziness, headache, flushing, or edema that are directly attributable to a prescribed peripheral vasodilator. It should be used when the healthcare provider is actively managing these adverse reactions during the initial phase of treatment. Examples include a patient presenting to the emergency department or an outpatient clinic for evaluation and management of a new adverse reaction to a recently started peripheral vasodilator.

• Always sequence this code first if it is the primary reason for the encounter.
• Remember to also code the specific manifestation of the adverse effect (e.g., R03.1 for hypotension).
• Distinguish from poisoning (T46.7X1-) or underdosing (T46.7X6-) of peripheral vasodilators.