The N290 remark code is a common issue on CMS-1500 remittance advice. It means there’s a problem with the provider’s NPI. In simpler terms, the rendering provider’s primary identifier—usually their NPI—is either missing, incomplete, or wrong. This remark code often shows up with CARC 16, which means the claim is missing required information and can’t be processed.
In 2025, it’s crucial to understand N290. Medicare contractors, such as Noridian, have listed it under “Missing/Incorrect Required NPI Information.” This article explains what N290 means, how it affects your billing, and how to fix or avoid it.
What Is the N290 Remark Code?
CMS defines N290 as: “Missing/incomplete/invalid rendering provider primary identifier.” This usually refers to the NPI in Box 24J on the CMS-1500 claim form.
If a valid NPI is not entered or is entered incorrectly, the claim will be denied. For example, using an outdated PIN or leaving Box 24J blank often causes this code. Starting in 2025, payers only accept NPIs in this field. Therefore, any other type of identifier leads to a denial.
Common Causes of N290 Denials
- Missing or invalid NPI: Box 24J is blank or the NPI is no longer active.
- Wrong entity type: A group NPI is entered when an individual one is needed.
- NPI not linked to PTAN: The provider’s NPI is not associated with the group’s Medicare enrollment.
- Incorrect NPI placement: Box 24J and 33A are filled in the wrong way, causing mismatch errors.
CMS and Payer Guidance for 2025
To avoid N290 issues in 2025, follow these steps consistently:
- Use valid NPIs in the correct boxes on the CMS-1500 form.
- Never use legacy identifiers like UPIN or PIN.
- Check that NPIs match PECOS or NPPES enrollment data.
- Understand that N290 denials usually can’t be appealed, so fixing them early is important.
Additionally, check with your MAC or visit payer sites such as UnitedHealthcare for specific details. You can also review our guide on using Box 24J and 33A correctly.
How to Fix an N290 Denial
When a claim is denied due to N290, take the following steps:
- Verify the NPI: Use the NPI Registry to confirm the provider’s NPI is correct and active.
- Double-check field placement: The individual NPI belongs in Box 24J, and the billing or group NPI goes in Box 33A.
- Ensure proper enrollment: The provider’s NPI must be linked to your group’s PTAN in PECOS.
- Correct and resubmit: Update the claim with the right information and submit it again. These claims usually cannot be appealed, so correction is your only option.
Tips to Prevent N290 Denials
- Keep your NPPES and PECOS records current at all times.
- Train staff to understand how to fill Box 24J and Box 33A correctly.
- Use claim editing software that checks for NPI errors before submission.
- Regularly review denial trends so you can find and fix problems early.
FAQ: Quick Answers About N290
What triggers the N290 code?
The N290 code appears when a provider’s NPI is missing, wrong, or inactive. Most often, the error is in Box 24J of the CMS-1500 form.
Can I appeal an N290 denial?
No. Since it’s an unprocessable claim, you must fix the issue and resubmit it. Appeals are not allowed for this type of error.
Does only Medicare use N290?
Not at all. Many Medicaid and private payers also use N290 or a similar code for incorrect provider identifiers.
Conclusion
To summarize, the N290 remark code signals a problem with the rendering provider’s NPI. As a result, the claim will not be processed. In 2025, payers are stricter than ever. Therefore, it’s essential to double-check your NPIs, follow CMS field rules, and train your team. These steps will help you avoid N290 and keep your revenue flowing.
Need more help? Check out these detailed guides: