Medicare Ordering & Referring Eligibility Check
Being on the Medicare Order and Referring file is not one permission. It is five. A provider can be cleared to order Part B services and still be marked No for hospice, home health or power mobility, and the claim is denied on the category that says No. Enter an NPI to see all five flags, the provider’s Medicare revalidation dates, and whether they have opted out of Medicare.
- 2,037,794 NPIsOn the current Order and Referring file
- Refreshed twice a weekRead live from CMS, never cached here
- Three datasets, one NPIOrdering, revalidation, opt-out
- FreeNo login, runs in your browser
Why the Ordering Provider Denies a Claim You Did Not Order
The provider who bills a service and the provider who ordered it are often not the same person. A laboratory bills a panel a family physician ordered. A DME supplier bills a wheelchair an internist prescribed. A home health agency bills a plan of care a hospitalist certified. In each case the billing entity is paid or not paid on the strength of somebody else’s Medicare enrollment record, which they did not create and cannot fix.
CMS maintains a single file of every NPI that is eligible to order and refer. The rule is not subtle: if the ordering or referring NPI on the claim is not on that file, the claim is denied. It does not matter that the order was clinically appropriate, that the patient received the item, or that the documentation is immaculate.
Two details make this harder than it sounds, and both are visible in the check above.
The name has to match, not just the number
MAC guidance is explicit that a claim is also denied when the NPI is present but the first four letters of the last name, or the first initial of the first name, do not match what CMS holds. Married names, hyphenated names, suffixes and transposed first and last names all cause this. The check above prints the name exactly as it appears in the CMS file so you can compare it against what is going out on the claim.
Eligibility is granted by benefit category, not as a single switch
This is the part almost nobody checks, and it is the subject of the next section.
The Five Benefit Categories Are Separate
Every row in the Order and Referring file carries five independent Yes or No flags: Part B, DME, home health, power mobility devices and hospice. Counting them across the whole current file gives a picture that is very different from “the provider is on the list”.
| Category | Eligible | Not eligible |
|---|---|---|
| DME | 2,037,790 | 4 |
| Part B | 1,943,742 | 94,052 |
| Home health | 1,698,939 | 338,855 |
| Power mobility | 1,618,768 | 419,026 |
| Hospice | 1,144,797 | 892,997 |
Nearly 893,000 providers who are on the file cannot order hospice. Over 419,000 cannot order a power wheelchair. Over 338,000 cannot order home health. A biller who confirms the NPI is on the file and stops there has checked the one thing that is almost always true and skipped the four that are not.
The practical consequence is that the same physician can be a perfectly valid ordering provider on a lab claim on Monday and an invalid one on a hospice certification on Tuesday. Nothing about the provider changed. The benefit category did.
What the Denial Looks Like
For home health claims, MAC guidance lists reason codes 37236, 37237 and 37247 when the ordering, referring or attending practitioner on the claim does not match the file. 37236 applies to initial claims and 37237 to adjustments. A separate code is used when the enrollment record carries a termination date on or before the claim from date.
The important thing about these denials is that most of them are not reversible on appeal. MAC guidance is direct about it: where the practitioner has no Medicare enrollment record, or the record shows a termination date on or before the date of service, or the specialty is not one eligible to order that benefit, the denial stands. There is nothing to argue. The service was furnished on an order that Medicare does not recognise, and no amount of documentation changes that after the fact.
That is why this is worth checking before the service rather than after the denial. It is one of the few denial types where a thirty second check genuinely prevents the loss, and where the appeal is genuinely hopeless if you skip it.
Other benefit categories surface the same problem through different codes and remark codes depending on the contractor and the claim type, so check your own remittance advice rather than assuming the home health numbers appear on a Part B or DME remit.
Revalidation, and Why Missing It Ends in Deactivation
Medicare enrollment is not permanent. Providers revalidate on a cycle, and a provider who misses the deadline can have their billing privileges deactivated. A deactivated enrollment does not just stop that provider billing. It removes them from the Order and Referring file, which means every claim that names them as the ordering provider starts failing too.
CMS publishes a Revalidation Due Date List, and the check above reads it. Two things about that file are worth knowing.
First, a provider can hold several Medicare enrollments at once, in more than one state or under more than one specialty, and each one carries its own revalidation date. The tool lists every enrollment record it finds rather than only the first, because a practice that revalidated one enrollment and assumed it covered the others is a common way to end up deactivated while believing you are current.
Second, the file is described by CMS as containing providers due to revalidate in the following six months, with everything else marked TBD. Of its 2,943,135 enrollment records, 2,665,340 are marked TBD, which is 90.6 per cent, and 277,795 carry a real date. What is less expected is that a large share of those real dates have already passed, with due dates in the file going back as far as July 2023. We are not going to tell you what that means, because CMS does not say and we will not guess: it could be records awaiting an update, providers who revalidated without the file catching up, or genuinely overdue enrollments. But if the check returns a date in the past for an NPI you rely on, that is worth a direct confirmation in PECOS rather than an assumption either way.
Opting Out Is Not the Same as Being Unable to Order
A provider who has opted out of Medicare does not bill Medicare for their own services. Patients see them under a private contract instead. It is easy to assume that an opted-out provider therefore cannot be the ordering provider on anybody else’s claim.
That assumption is wrong often enough to matter. The CMS Opt Out Affidavits file, which currently holds 57,780 providers, carries its own column called Eligible to Order and Refer, and it is set to Yes for many of them. Opting out and ordering eligibility are tracked separately. The check above reads that column and tells you which way it falls for the NPI you entered, along with the opt-out effective and end dates, because an opt-out period that has expired is a different situation again.
What This Check Cannot Tell You
Being straight about the limits matters more here than usual, because the consequence of a wrong assumption is an unappealable denial.
- It is a snapshot, not a guarantee. CMS replaces the Order and Referring file about twice a week. A provider can be on it today and off it after the next refresh.
- It does not read PECOS directly. These are published extracts. PECOS is the system of record, and for a decision that carries real money it is the place to confirm.
- It does not check the date of service. Eligibility is judged against the enrollment record as it stood on the date the service was furnished. The file you are reading is current, not historical.
- It does not validate the name on your claim. It shows you the name CMS holds. Comparing that against what your system is sending is still a human step.
- It does not cover Medicaid or commercial payers. These are Medicare enrollment files. State Medicaid programs maintain their own ordering and referring requirements.
- It cannot explain a denial on its own. If a claim was denied and the check comes back clean, the cause is something else, and the remittance advice is the place to look.
Common Questions
My provider is on the Order and Referring file but the claim was still denied. Why?
Three usual causes. The benefit category may be marked No even though the NPI is present, which the five tiles above will show. The name on the claim may not match the name CMS holds, which is a denial in its own right. Or the enrollment may have been valid now but not on the date of service.
What does it mean when hospice is No but Part B is Yes?
The provider may order and refer Part B services but is not of a type or specialty eligible to certify or order hospice. It is not an error in the file and it is not something the billing provider can override.
Can I appeal a denial for an ineligible ordering provider?
Generally no. Where the practitioner has no Medicare enrollment record, the record shows a termination date on or before the date of service, or the specialty is not eligible for that benefit, MAC guidance treats the denial as not reversible.
How current is this data?
The Order and Referring file is replaced about twice a week and the tool reads whatever CMS is serving at that moment rather than a stored copy. The revalidation and opt-out files are updated monthly.
Does the tool store the NPIs I look up?
No. The request goes from your browser straight to the CMS data service. Nothing is logged or retained by this site.
Why does one NPI show several revalidation rows?
Because a provider can hold more than one Medicare enrollment, for example in different states or under different specialties, and each has its own revalidation date.
What is the difference between this and an NPI registry lookup?
An NPI registry tells you a number exists and who it belongs to. It says nothing about Medicare enrollment, ordering eligibility by benefit category, revalidation or opt-out status. Those are the things that decide whether the claim pays.
Sources and Methodology
The check reads three datasets published by the Centers for Medicare & Medicaid Services on data.cms.gov, through the public data API, live at the moment you run it:
- Order and Referring — every NPI of a type or specialty legally eligible to order and refer in Medicare, with separate flags for Part B, DME, home health, power mobility and hospice. 2,037,794 rows in the file published 29 September 2026.
- Revalidation Due Date List — Medicare enrollment records with revalidation due dates, 2,943,135 rows.
- Opt Out Affidavits — providers who have opted out of Medicare, 57,780 rows, including their ordering and referring eligibility.
The category counts in the table above were produced by downloading the complete Order and Referring file and counting the Yes values in each of the five columns across all 2,037,794 rows. The revalidation figures come from the same exercise on the complete Revalidation Due Date List. Reason code behaviour is drawn from published Medicare Administrative Contractor guidance for home health claims. All of these files are free, published by CMS, and carry no licence restriction.