(a) (1) Every insurer shall commence an investigation of any claim filed by a claimant, or by a claimant's authorized representative, within 15 business days of receiving notice of claim. An insurer shall furnish to every claimant, or claimant's authorized representative, a notification of all items, statements and forms, if any, which the insurer reasonably believes will be required of the claimant, within 15 business days of receiving notice of the claim. A claim filed with an agent of an insurer
(a) Every insurer, upon notification of a claim, shall, within 15 business days, acknowledge the receipt of such notice. Such acknowledgment may be in writing. If an acknowledgment is made by other means, an appropriate notation shall be made in the claim file of the insurer. Notification given to an agent of an insurer shall be notification to the insurer. If notification is given to an agent of an insurer, such agent may acknowledge receipt of such notice. Unless otherwise provided by law or contract