(a) After receipt of due proof of claim, a group hospital service corporation shall pay each claim presented under a membership certificate in full not later than the 60th day after the date on which the applicable services prescribed in the certificate have been provided.
(b) Written notice of a claim given to a group hospital service corporation is considered due proof of claim under this section if the corporation does not provide the claimant with the forms usually provided by the corporation for filing a claim before the 16th day after the date notice is received.