Adverse effect of methamphetamines, initial encounter

This code signifies a patient experiencing an unintended and undesirable reaction to methamphetamine, which was properly administered or taken as prescribed. The adverse effect can manifest in various ways, such as cardiovascular complications, neurological symptoms, or psychiatric disturbances, and is distinct from poisoning or overdose.

Apply this code when documenting a patient's initial presentation for treatment of an adverse reaction to methamphetamine. This includes situations where the drug was used therapeutically (e.g., for ADHD, though less common now) or recreationally, and the patient is experiencing an unwanted side effect rather than an intentional overdose or toxic effect.

• Always assign an additional code to specify the nature of the adverse effect (e.g., tachycardia, psychosis).
• Distinguish carefully between adverse effect (proper use, unwanted reaction) and poisoning (improper use, overdose, or wrong substance).
• The "A" seventh character indicates an initial encounter for the adverse effect.