N290 means the rendering provider's NPI on the claim is missing, wrong, or not linked to the billing group in the payer's records. Check the NPI on the claim and the provider's enrollment with the payer, fix it, and resubmit.
The official wording
The X12 Remittance Advice Remark Code list defines N290 as: "Missing/incomplete/invalid rendering provider primary identifier."
Common causes
- The rendering NPI is blank or the group NPI was used instead.
- A typo in the NPI.
- The provider is not linked to the group in the payer's enrollment.
- A new provider is billing before enrollment is complete.
Send us the list: payer, date of service, denial code and amount. No patient names needed. We will tell you which claims can still be fixed, which need an appeal, and which deadlines are close. Free, usually within 2 business days. Want the full picture? Get a free 90-day denial audit from your ERA files.
Run a billing company? Add a trained biller from $8/hour, first 25 claims free.
How to fix it
- Check the rendering NPI on the claim (box 24J, loop 2310B) against the NPPES registry.
- Check enrollment with the payer for that provider and group.
- Fix the provider record in your system and resubmit. With Medicare and MA130, send a new claim.
What N290 looks like on a remittance
| Line on the remittance | What it means |
|---|---|
| CO-16 | The claim has a billing error or missing data |
| N290 | The missing or bad data is the rendering provider's NPI |
| MA130 (Medicare) | Unprocessable claim. No appeal rights. Send a new claim. |
Because the claim was never processed, fixing it is fast. Correct the NPI and send a new claim. An appeal will not work.
The four provider NPI remark codes
N290 is one of a set. Each one points to a different provider box on the claim.
| Remark code | Official wording | Where on the CMS-1500 | Where on the 837P |
|---|---|---|---|
| N290 | "Missing/incomplete/invalid rendering provider primary identifier." | Box 24J | Loop 2310B (or 2420A at line level) |
| N257 | "Missing/incomplete/invalid billing provider/supplier primary identifier." | Box 33a | Loop 2010AA |
| N286 | "Missing/incomplete/invalid referring provider primary identifier." | Box 17b | Loop 2310A |
| N265 | "Missing/incomplete/invalid ordering provider primary identifier." | Box 17b | Loop 2420E |
Solo provider or group?
- Solo provider billing under their own NPI: Medicare says leave box 24J blank. The billing NPI in 33a is the rendering NPI too.
- Group practice: put the group (type 2) NPI in 33a and the individual (type 1) NPI of the provider who did the service in 24J.
- Medicare groups: the rendering provider must have reassigned benefits to the group in PECOS (form CMS-855R). If that link is missing, N290 keeps coming back even with a correct NPI.
How to fix N290 step by step
- Look up the NPI in the NPPES registry and confirm it belongs to the provider who saw the patient.
- Check that it is a type 1 (individual) NPI, not the group's type 2 NPI.
- Confirm the provider is enrolled with this payer and linked to your group.
- Fix the provider record in your billing system so the next claims are right.
- Send a new claim. For Medicare with MA130, do not send a corrected claim or an appeal.
N290 checklist
- ☐ Box 24J or loop 2310B has the rendering provider's individual NPI.
- ☐ Box 33a or loop 2010AA has the billing NPI.
- ☐ The rendering provider is enrolled and linked to the group with this payer.
- ☐ New providers do not bill until enrollment is approved.
Questions people ask about N290
Is N290 a denial?
It is a remark code that explains a denial, usually CO-16.
Where does the rendering NPI go on the claim?
Box 24J on the CMS-1500, or loop 2310B on the electronic 837P.
Should a solo provider fill in box 24J?
For Medicare, no. A solo provider who bills under their own NPI leaves 24J blank and reports the NPI in box 33a. Other payers may differ, so check their manual.
What is the difference between N290 and N257?
N290 is about the rendering provider, the person who did the service. N257 is about the billing provider, the practice or group being paid.
Why do I still get N290 when the NPI is correct?
The provider is probably not linked to the group in the payer's enrollment. For Medicare, check the reassignment in PECOS.
Seeing N290 on your remittances?
Send us 25 claims and we will group your denials by reason and remark code and show you which fix removes the most of them. Free, no setup fee.
Start the free 25-claim trialFiling limits, appeal windows and claim addresses change quietly. Get one short email a month with what changed and the free tools we add.
One email a month. No spam. Unsubscribe any time.Other denial code guides
All denial code guides
PR-1 · PR-2 · PR-3 · CO-4 · CO-5 · CO-11 · CO-15 · CO-16 · OA-18 · CO-22 · OA-23 · CO-24 · CO-26 · CO-27 · CO-29 · CO-31 · CO-45 · CO-49 · CO-50 · CO-59 · PR-96 · CO-97 · CO-109 · CO-119 · CO-129 · CO-140 · CO-146 · CO-151 · CO-167 · CO-170 · CO-181 · CO-185 · CO-197 · CO-198 · PR-204 · CO-234 · CO-236 · CO-242 · CO-252 · CO-253 · CO-288 · CO-A1 · CO-B7 · MA130 · N130 · N23 · N290
Timely filing limits by payer: Cigna timely filing limit · HealthSpring timely filing limit · Aetna timely filing limit · UnitedHealthcare timely filing limit · Humana timely filing limit · corrected claim timely filing limits
Sources: X12 Remittance Advice Remark Code list (N290), read October 27, 2026; CMS Medicare guidance where Medicare rules are mentioned; Noridian Medicare JE Part B reason code guidance, "Missing/Incorrect Required NPI Information" (CO-16 with N290 and N257), read October 27, 2026; X12 RARC list (N286, N265). Last reviewed October 27, 2026. General information, not coding or legal advice. Payer rules differ, so check the remark code and the payer's own policy.