Underdosing of unspecified drugs acting on muscles, sequela

This code signifies a long-term health problem or condition that arose as a direct consequence of a patient not taking their prescribed muscle-acting medication as directed. It indicates that the underdosing event itself is in the past, but its effects are still present and require ongoing management.

Apply this code when documenting a chronic condition or persistent symptom directly attributable to a prior instance of underdosing medications that primarily affect muscle function (e.g., muscle relaxants, certain antispasmodics). This is appropriate for follow-up encounters where the sequela, not the acute underdosing event, is the focus of treatment.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., muscle weakness, spasticity).
• Ensure documentation clearly links the current condition to a past underdosing event of a muscle-acting drug.
• Do not use for acute underdosing events; reserve for the lasting effects.