California Code, Insurance Code - INS § 10111.2

(a) Under a policy of disability insurance other than health insurance, as defined in Section 106, including a policy of disability income insurance, as defined in subdivision (c) of Section 799.01, payment of benefits to the insured shall be made within 30 calendar days after the insurer has received all information needed to determine liability for a claim.  However, the 30-calendar-day period shall not include any time during which the insurer is doing any of the following:

(b) If the insurer has not received all information needed to determine liability for a claim within 30 calendar days after receipt of the claim, the insurer shall notify the insured in writing and include a written list of all information it reasonably needs to determine liability for the claim.  In that event, the 30-calendar-day period set out in subdivision (a) shall commence when the insured has provided to the insurer all information in that notification.  If no notice is sent by the insurer within 30 calendar days after the claim is filed by the insured, interest shall begin to accrue on the payment of benefits on the 31st calendar day after receipt of the claim, at the rate of 10 percent per year.

(c) When the insurer has received all information needed to determine liability for a claim, and the insurer determines that liability exists and fails to make payment of benefits to the insured within 30 calendar days after the insurer has received that information, any delayed payment shall bear interest, beginning the 31st calendar day, at the rate of 10 percent per year.  Liability shall, in all cases, be determined by the insurer within 30 calendar days of receiving all information set out in the insurer's written notification to the insured.

(d) Nothing in this section is intended to restrict any other remedies available to an insured by statute or any other law.