N799 Remark Code: Group ID Sent Where Individual Needed

What N799 means

Claims identify several providers in different roles: the billing provider who gets paid, the rendering provider who performed the service, and sometimes a referring or ordering provider. Some of those roles can only be filled by a person. N799 appears when the payer finds an organization’s identifier in a slot that must hold an individual’s.

In practice this almost always involves NPIs. Organizations have Type 2 NPIs; individual clinicians have Type 1. Putting the group NPI in the rendering, referring, or ordering field triggers N799, usually with CARC 16.

Common causes

• Rendering NPI defaulted to the group. The practice management system fills box 24J with the billing NPI when no individual provider is attached to the charge.
• Referring provider entered as a clinic. The referral came from a practice, and staff entered the practice’s NPI instead of the referring clinician’s.
• New provider not yet set up. A clinician hasn’t been added to the system, so claims fall back to the organization’s identifier.
• Clearinghouse mapping that copies the billing NPI into the rendering loop.

How to fix it

1. Identify the field. Check which provider role on the claim holds the group identifier.
2. Look up the correct individual NPI in the NPPES registry and confirm it is the clinician who actually performed or referred the service.
3. Correct the claim: individual NPI in 24J or 17b, with the group NPI in 33a as billing provider where appropriate.
4. Resubmit. Use a new claim for a front-end rejection or a corrected claim with resubmission code 7 in box 22 for an adjudicated denial.

How to prevent it

• Require an individual rendering provider on every charge before it can be billed.
• Store referring providers as individuals, not practices, in your referral records.
• Enroll new clinicians with each payer before their first claims go out. See provider enrollment denials.