Underdosing of unsp drugs acting on muscles, subs encntr

This code indicates that a patient is experiencing adverse effects or complications due to receiving less than the prescribed or recommended dosage of an unspecified medication primarily affecting muscle function. This underdosing is not the initial event but rather a follow-up encounter for ongoing management or assessment of the resulting issues.

Use this code when a patient presents for a subsequent visit related to symptoms or conditions arising from insufficient dosing of a muscle relaxant, neuromuscular blocker, or other drug acting on muscles, and the specific drug is not documented. This applies when the underdosing is an ongoing problem or its effects are still being addressed after the initial presentation.

• Always sequence this code after the code(s) for the specific manifestation(s) of the underdosing.
• Ensure documentation clearly states "underdosing" and specifies that this is a subsequent encounter.
• If the specific drug is known, a more precise code from the T48.2 subcategory should be used instead.