Anthem is supposed to implement the pre-authorization requirement with AIM on 3/25/2019 but Anthem reps appear to be unaware of it based on feedback we've received from some PT clinics. AIM reps are a bit confused also, and one said it starts April 1, 2019 (or is that an April Fool?).
See the attached document from Anthem. Anthem Prior Auth begins March-25-2019.pdf