N290: Missing, incomplete or invalid rendering provider identifier

What causes it

• Rendering NPI left blank when it differs from the billing NPI, or the group NPI entered in its place
• An individual NPI the payer has not enrolled or linked to the billing group
• A new hire seeing patients before enrollment with this payer was complete
• A typed NPI with a wrong check digit

How to work it

1. Check the NPI against the NPPES registry and put the individual’s NPI in the rendering provider field, with the group NPI as billing provider.
2. If the NPI is right, this is enrollment: confirm with the payer that the clinician is enrolled and linked to the group for that date of service, and rebill once the link is effective.
3. Where the effective date is after the date of service, ask the payer about retroactive enrollment before writing anything off; some allow it.

How to stop it recurring

Do not schedule a new clinician for a payer’s patients until that payer confirms the enrollment and the group link in writing.

Codes worked the same way

N290 is corrected and resubmitted. So are these, which is why a queue sorted by recovery route moves faster than one sorted by code number — the same person, in the same system, with the same evidence to hand, clears all of them in one pass.

• CO-16 — Claim lacks information
• CO-4 — Modifier and code disagree
• CO-11 — Diagnosis and procedure disagree
• CO-140 — Member ID and name disagree
• CO-5 — Wrong place of service
• CO-9 — Diagnosis and age disagree

Specialties that name this among their costliest

These are specialties whose own worst denials include one of this kind. The line under each is the denial they name, quoted from their page so you can see what the link is based on.

• Pain Management
  Bilateral procedures billed without the correct modifier
• Anesthesia
  Time units miscalculated from an incomplete anesthesia record
• Orthopedics
  Modifier 25 denied on an E/M billed the same day as a procedure
• Behavioral Health
  Telehealth denied for the wrong place-of-service or modifier
• Gastroenterology
  Screening colonoscopy converted to diagnostic without modifier PT or 33
• Dermatology
  Modifier 59 on multiple lesion removals rejected as unbundling

What leaving it costs

Working a denied claim costs $57.23 per denied claim in administrative time. Source. At 100 denials a month — an illustration, not a measurement of your practice — that is $5,723 a month, or $68,676 a year, in labour alone.

The figure that makes it worth spending: about 90% of initially denied claims are eventually paid. Source. The reason a denial sits is almost never that nobody knows how to work it — it is that nobody has the hours.

Questions

Code descriptions are the standard X12 claim adjustment reason and remittance advice remark code text. Payer policies differ, and the payer’s own coverage policy governs any individual claim. This page is working guidance, not legal or clinical advice.