Adverse effect of local anesthetics, initial encounter

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of a local anesthetic. These reactions are not due to an overdose or poisoning, but rather an adverse physiological response to the drug itself when administered correctly. Symptoms can range from mild allergic reactions to more severe systemic effects.

Apply this code when documenting a patient's initial presentation for symptoms directly attributable to an adverse effect of a local anesthetic, such as lidocaine or bupivacaine, used for pain control or minor procedures. This includes allergic reactions, localized tissue damage, or systemic toxicity occurring during the first encounter for this specific adverse event.

• Always sequence this code first, followed by codes for the specific manifestation of the adverse effect (e.g., rash, anaphylaxis).
• Ensure documentation clearly distinguishes an adverse effect from an overdose (T41.3X1-) or poisoning (T41.3X2-).
• The "A" seventh character indicates an initial encounter for the adverse effect, meaning the patient is receiving active treatment for the condition.