RARC N286: Missing, Incomplete, or Invalid Referring Provider Primary Identifier
RARC N286 means the referring provider's primary identifier — the NPI of the provider who referred the patient — is missing, incomplete, or invalid on the claim. It rides with CO-16 as unprocessable. The fix is entering a valid, enrolled referring-provider NPI in the correct field and resubmitting.
- Type
- Informational (supplemental)
- Usually paired with
- CO-16
- Fixable?
- Yes — always
- Typical fix
- Add valid, enrolled referring-provider NPI; resubmit corrected claim
What does remark code N286 mean?
Official X12 text: "Missing/incomplete/invalid referring provider primary identifier." The payer needs to know who referred the patient and cannot validate that identifier. On consultations and referred services, the referring provider's NPI must be present, valid, and — for Medicare — enrolled in PECOS. Blank, malformed, or unenrolled, and the line stops.
ERA mini-example: 99244 (office consultation) billed $250.00 denies with CO-16 and N286 because box 17b was empty. Resubmitted with the referring physician's valid, PECOS-enrolled NPI in the referring-provider field, the consultation adjudicates and pays.
Which denial code does N286 come with?
Almost always CO-16, since the claim is missing information required to process and is treated as unprocessable. Its sibling is N265 for the ordering provider identifier — different field, different provider role. Confirm which identifier failed in the denial code lookup so you correct the right loop the first time.
How do you fix an N286 denial?
- Find the referring provider on the referral or order and pull their NPI from the NPPES registry.
- Confirm the NPI is valid and, for Medicare, that the referring physician is enrolled and eligible in PECOS.
- Enter the NPI in the referring-provider field (box 17/17b or the 837 referring loop) — not ordering or billing.
- Submit a corrected claim and verify clearinghouse acceptance before it reaches the payer again.
How do you prevent N286?
Capture the referring provider's name and NPI at scheduling for every consult and referred service, and validate against NPPES before the visit. For Medicare, keep a checked list of referring physicians confirmed as PECOS-enrolled. Add a scrubber edit that holds consultation and referred-service claims lacking a valid referring identifier, and train the front desk that "who sent the patient" is a required intake field, not an optional one.
Frequently asked questions
N286 is the referring provider identifier — the provider who referred the patient for a consult or service. N265 is the ordering provider identifier — who ordered a test or item. Payers treat referring and ordering as distinct fields on the claim, so read the exact remark and correct the matching loop; fixing the wrong one leaves the denial in place.
Consultations and referred services require the referring physician's NPI in box 17/17b or the electronic equivalent. It denies when the field is blank, the NPI is invalid, or — for Medicare — the referring physician is not enrolled in PECOS. Specialists who take referrals see N286 constantly when the front desk does not capture the referring provider at scheduling.
No. N286 rides with CO-16, a contractual-obligation code for a claim that could not be processed. It is a billing-side data gap, not a coverage decision, and the claim was never adjudicated on benefits. Correct the referring-provider identifier and resubmit; do not bill the patient for this rejection.
Sources & further reading
Reviewed by the ImmediCare Solutions RCM team
Certified billers and coders handling claims across 50+ specialties nationwide. This entry is reviewed against current payer policy and CMS rules. Last review: Jul 5, 2026.
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