New patient qualifications not met
A new patient visit was billed, but the payer's records show the patient was seen by the same provider, or by another provider of the same specialty in the same group, within the past three years.
CO = Contractual Obligation. The provider owes the difference. The patient cannot be billed for this amount. The same reason code can appear with a different group code; the group decides who may be billed.
Usual causes
- Patient seen by a partner of the same specialty in the last three years.
- Patient seen by the same provider at a previous practice (payer history follows the NPI).
- Previous visit was a telehealth or hospital encounter that still counts.
The fix
Check the three-year history across the group. Change the visit to the matching established patient code and send a corrected claim. The payer usually pays the established level automatically only when the levels map; otherwise resubmit.
Appeal or corrected claim?
Corrected claim with the established patient code.
Deadline to watch
Timely filing limit.
Exact limits are in your payer contract or provider manual. When in doubt, send the correction or appeal this week.
CO-B16 in short
What does CO-B16 mean?
A new patient visit was billed, but the payer's records show the patient was seen by the same provider, or by another provider of the same specialty in the same group, within the past three years. The official X12 text reads: "'New Patient' qualifications were not met."
What usually causes a CO-B16 denial?
Patient seen by a partner of the same specialty in the last three years. Patient seen by the same provider at a previous practice (payer history follows the NPI). Previous visit was a telehealth or hospital encounter that still counts.
How do I fix CO-B16?
Check the three-year history across the group. Change the visit to the matching established patient code and send a corrected claim. The payer usually pays the established level automatically only when the levels map; otherwise resubmit.
Should I appeal CO-B16 or send a corrected claim?
Corrected claim. Corrected claim with the established patient code.
What deadline applies to CO-B16?
Timely filing limit.