New Mexico Statutes Chapter 57. Trade Practices and Regulations § 57-32-7. Receipts for payments

A. Within thirty business days of receipt of a payment on a medical debt, the health care facility, third-party health care provider, medical creditor, medical debt collector or their agents receiving the payment shall send a receipt to the person who made the payment. The receipt may take the form of a billing statement. All receipts shall show:

B. All health care facilities, third-party health care providers, medical creditors and medical debt collectors shall apply payments as of the date payment was received or, if received after business hours, the next business day, and use that date when assessing penalties or interest accumulation.