After a change of claims payment address or a change in delegation of claims payment functions, an MCC may not premise the denial of a clean claim on a preferred provider's failure to file a claim within the claim filing deadline set out in § 21.2806 of this title (relating to Claim Filing Deadline), unless the MCC has given timely written notice as required by § 21.2811(b) of this title (relating to Disclosure of Processing Procedures).
28 Tex. Admin. Code § 21.2812