Underdosing of other drugs acting on muscles, sequela

This code indicates a patient is experiencing a long-term consequence or complication directly resulting from insufficient intake or administration of a medication primarily affecting muscle function, other than skeletal muscle relaxants. These lasting effects are present after the acute phase of the underdosing has passed.

Use this code when documenting chronic muscle weakness, spasticity, or other persistent neuromuscular dysfunction that is a direct sequela of previously inadequate dosing of drugs like cholinergics, anticholinergics, or other agents impacting smooth or cardiac muscle. This applies when the underdosing event itself is no longer active, but its effects remain.

• Always sequence this sequela code after the code for the specific condition or symptom being treated.
• Ensure documentation clearly links the current sequela to a past underdosing event of a muscle-acting drug.
• Distinguish from acute underdosing effects, which would use an initial or subsequent encounter character.