Underdosing of antiasthmatics, subsequent encounter

This code signifies a patient's underdosing of medication specifically prescribed to manage asthma, where the patient is receiving active treatment for the sequelae of the underdosing. Underdosing implies the patient took less than the prescribed amount of the antiasthmatic agent, leading to a recurrence or worsening of their asthmatic symptoms.

Apply this code when a patient presents for follow-up care, monitoring, or further treatment due to the ongoing effects of having taken an insufficient dose of their antiasthmatic medication. This includes scenarios where the patient is being managed for an asthma exacerbation directly attributable to the underdosing event that occurred previously.

• Always sequence this code after the primary diagnosis indicating the specific asthma condition (e.g., J45.x).
• Ensure documentation clearly links the current encounter to the underdosing event and specifies the antiasthmatic drug class involved.
• The "D" seventh character indicates a subsequent encounter, meaning the patient is receiving routine care during the healing or recovery phase.