Except as otherwise provided, a lien under AS 34.35.450 - 34.35.480 may not be allowed for hospitalization or the services of a physician or licensed special nurse furnished after a settlement is made by or on behalf of the person causing the injury unless the settlement is made within 20 days from the date of the injury. A lien is not allowed for necessary attorney fees, costs, and expenses incurred by the injured person in securing a settlement, compromise, or judgment.