CMS 1500 Box 13 - patient Singnature on file

The patient’s signature or the statement “signature on file” in this item authorizes payment of medical benefits to the physician or supplier. The patient or his/her authorized representative signs this item or the signature must be on file separately with the provider as an authorization. However, note that when payment under the Act can only be made on an assignment-related basis or when payment is for services furnished by a participating physician or supplier, a patient’s signature or a “signature on file” is not required in order for Medicare payment to be made directly to the physician or supplier.

The presence of or lack of a signature or “signature on file” in this field will be indicated as such to any downstream Coordination of Benefits trading partners (supplemental insurers) with whom CMS has a payer-to-payer coordination of benefits relationship. Medicare has no control over how supplemental claims are processed, so it is important that providers accurately address this field as it may affect supplemental payments to providers and/or their patients.

In addition, the signature in this item authorizes payment of mandated Medigap benefits to the participating physician or supplier if required Medigap information is included in item 9 and its subdivisions. The patient or his/her authorized representative signs this item or the signature must be on file as a separate Medigap authorization. The Medigap assignment on file in the participating provider of service/supplier's office must be insurer specific. It may state that the authorization applies to all occasions of service until it is revoked.