Adverse effect of calcium-channel blockers, init encntr

This code signifies an unintended and undesirable reaction to a calcium-channel blocker medication when it is administered correctly. These adverse effects can range from mild to severe and are not due to overdose or poisoning.

Apply this code when a patient experiences a side effect from a calcium-channel blocker, such as peripheral edema, headache, dizziness, or bradycardia, during their initial presentation for treatment of this reaction. This is appropriate when the medication was prescribed and taken as directed.

• Requires an additional code to identify the specific adverse effect experienced by the patient.
• Distinguish from poisoning (T46.1X1-T46.1X4) or underdosing (T46.1X6).
• The 7th character "A" indicates an initial encounter for the adverse effect.