(a) No insurer shall seek reimbursement of an overpayment or withhold any portion of any benefit payable as a result of a claim on the basis that the sum withheld or reimbursement sought is an adjustment or correction for an overpayment made under the same policy unless:

(b) With each claim payment, the insurer shall provide to the claimant and assignee, if any, an explanation of benefits which shall include, if applicable, the name of the provider or services covered, dates of service, and a clear explanation of the computation of benefits.

(c) An insurer may not impose a penalty upon any insured for noncompliance with insurer requirements for precertification of benefits unless such penalties are specifically and clearly set forth in writing in the policy or certificate of insurance.

(d) An insurer that contests a claim under California Insurance Code Section 10123.13 shall subsequently affirm or deny the claim within thirty (30) calendar days from the original notification. In the event an insurer requires additional time to affirm or deny the claim, it shall notify the claimant and assignee in writing. This written notice shall specify any additional information the insurer requires in order to make a determination and shall state any continuing reasons for the insurer's inability to make a determination. This notice shall be given within thirty (30) calendar days of the notice (required under Insurance Code Section 10123.13) that the claim is being contested and every thirty (30) calendar days thereafter until a determination is made or legal action is served. If the determination cannot be made until some future event occurs, the insurer shall comply with this continuing notice requirement by advising the claimant and assignee of the situation and providing an estimate as to when the determination can be made.

(e) When a policy requires preauthorization of non-emergency medical services, the preauthorization must be given immediately but in no event more than five (5) calendar days after the request for preauthorization. The preauthorization shall be communicated or confirmed in writing to the insured and the medical service provider, and shall explain the scope of the preauthorization and whether the preauthorization is or is not a guarantee of acceptance of the claim. In the event the preauthorization is denied, the reason(s) for the denial shall be communicated in writing to the insured and the medical service provider.

(f) No preauthorization shall be required by an insurer for emergency medical services.

(g) An insurer shall reimburse the insured or medical service provider for reasonable expenses incurred in copying medical records requested by the insurer.