Undrdose of pertussis vaccine, inc combin w pertuss, init

This code signifies that a patient received less than the prescribed or recommended dose of a pertussis-containing vaccine. This could be due to an error in administration, patient non-compliance, or other factors leading to an insufficient quantity of the vaccine being given. The patient may still require further doses to achieve full immunization.

Apply this code when documentation indicates that a patient was administered an inadequate amount of a pertussis vaccine, including those combined with diphtheria and tetanus (e.g., DTaP, Tdap). This is appropriate for the initial encounter where the underdosing event is identified or treated.

• Always verify the specific vaccine administered and confirm it contains a pertussis component.
• Ensure documentation clearly states that the dose was insufficient, not merely that a dose was missed or not given at all.
• Remember to also code any associated adverse effects or reasons for the underdosing if known and documented.