Frequency Code	Description	Note
0	Non-Payment/Zero	Use this code when the bill is submitted to a payer for informational purposes, the provider does not anticipate payment to result from submitting the bill; but needs to inform the payer of the non-reimbursable periods of confinement or termination of care.
1	Admit through Discharge Claim	Use this code when billing for a confined treatment or inpatient period. This will include bills representing a total confinement or course of treatment, and bills that represent an entire benefit period of the primary third party payer.
2	Interim - First Claim	This code is to be used for the first of a series of bills to the same third party payer for the same confinement or course of treatment.
3	Interim - Continuing Claim	This code is to be used when a bill for the same confinement or course of treatment has previously been submitted and it is expected that further bills for the same confinement or course of treatment will be submitted.
4	Interim - Last Claim	Use this code for the last of a series of bills, for which payment is expected, to the same third party payer for the same confinement or course of treatment. Note: Do not use this code in lieu of a code for Late Charges or Non-Payment/Zero Claims.
5	Late Charge(s) Only	Use this code for submitting charges to the payer, which were received by the provider after the Admit Through Discharge, or the Last Interim Claim has been submitted. Note: This code is not intended to be used in lieu of a Replacement Claim
6	Reserved for assignment by the NUBC.	Reserved for assignment by the NUBC.