Adverse effect of unsp drugs acting on muscles, init encntr

This code signifies an unintended and harmful reaction experienced by a patient due to an unspecified medication that primarily affects muscle function. The reaction is not the intended therapeutic effect of the drug and occurred during the initial phase of treatment or exposure.

Apply this code when a patient presents with an adverse event, such as muscle weakness, spasms, or rigidity, that is definitively linked to a drug acting on muscles, but the specific drug or drug class is not documented. This is appropriate for the initial encounter for this adverse effect.

• Ensure documentation clearly states the adverse effect is due to a drug, even if the specific drug is unknown.
• Confirm the encounter is for the initial treatment of this adverse reaction.
• Do not use if the drug is known; instead, use a more specific code from the T48.2 category.