Claims not filed in a timely manner. Claims overlooked for reimbursement; had to call twice and finally the rep advised that they overlooked the reimbursement and forgot to send to me so she processed it for me. So if you don't go over the details of your claims and question why you didn't receive a reimbursement, Pets Best will overlook it. This has happened to me on two separate occasions. Very disappointing that you have to re-check and fight for your accurate and submittable claims because they "forgot" to send you your reimbursement or overlooked it.