Field 23 - Prior Authorization Number
The “Prior Authorization Number” is the payer assigned number authorizing the service(s).
NUCC INSTRUCTIONS: Enter any of the following: prior authorization number, referral number, mammography certification number, or Clinical Laboratory Improvement Amendments (CLIA) number, as assigned by the payer for the current service.
Do not enter hyphens or spaces within the number.
MEDICARE INSTRUCTIONS - Enter the Quality Improvement Organization (QIO) prior authorization number for those procedures requiring QIO prior approval.
Enter the Investigational Device Exemption (IDE) number when an investigational device is used in an FDA-approved clinical trial. Post Market Approval number should also be placed here when applicable.
For physicians performing care plan oversight services, enter the NPI of the home health agency (HHA) or hospice when CPT code G0181 (HH) or G0182 (Hospice) is billed.
Enter the 10-digit Clinical Laboratory Improvement Act (CLIA) certification number for laboratory services billed by an entity performing CLIA covered procedures.
For ambulance claims, enter the ZIP code of the loaded ambulance trip’s point-of-pickup.
NOTE: Item 23 can contain only one condition. Any additional conditions should be reported on a separate CMS-1500 claim form.
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