Texas Insurance Code - INS § 1301.1021. Receipt of Claim

(a) If a claim for medical care or health care services provided to a patient is mailed, the claim is presumed to have been received by the insurer on the fifth day after the date the claim is mailed or, if the claim is mailed using overnight service or return receipt requested, on the date the delivery receipt is signed.

(b) If the claim is submitted electronically, the claim is presumed to have been received on the date of the electronic verification of receipt by the insurer or the insurer's clearinghouse.  If the insurer or the insurer's clearinghouse does not provide a confirmation within 24 hours of submission by the physician or health care provider, the physician's or provider's clearinghouse shall provide the confirmation.  The physician's or provider's clearinghouse must be able to verify that the filing contained the correct payor identification of the entity to receive the filing.

(c) If the claim is faxed, the claim is presumed to have been received on the date of the transmission acknowledgment.

(d) If the claim is hand delivered, the claim is presumed to have been received on the date the delivery receipt is signed.