Credentialing a new practice is mostly a sequencing problem. Every application depends on something that has to exist first: payers won’t look at a group without a tax ID, a Type 2 NPI, a bank account in the legal business name, and a real practice address, and Medicare won’t accept the application until you’re within 60 days of opening. Get the order right and the payer clocks start early. Get it wrong and you open the doors with a full schedule and nobody you can bill.
This checklist walks through what has to exist before you apply anywhere, the order to file in, and what it costs when the sequence slips. It’s written for clinicians leaving a group to open their own practice and for owners launching a new location under a new tax ID.
Why Your Providers’ Old Enrollments Don’t Carry Over
Credentialing follows the clinician; contracting follows the tax ID. In our experience, it’s the most expensive misunderstanding in new-practice launches. Take a psychiatrist who has been in network with every major payer for ten years: she is still credentialed as an individual when she opens her own practice. Her new practice, with its new tax ID, has no contract with anyone.
Until each payer contracts the new entity, or links her to it, claims billed under the new tax ID come back denied or get paid out of network. Some payers handle this with a quick group application and a roster update. Others treat the new entity like any new applicant and run it through their full process, and some will tell you the panel is closed to new groups even though they already credential you as an individual. Medicare works the same way: her individual enrollment survives, but the new group needs its own enrollment and her benefits have to be reassigned to it.
The practical takeaway: budget the new practice’s timeline as if nobody is credentialed yet, because from the payer’s side the entity you’re billing under is brand new.
What Has to Exist Before You Apply Anywhere?
Six things have to be in place before the first payer application goes out, and almost all of them depend on the one before.
The legal entity and EIN. Form the PLLC, LLC, or corporation, then get the EIN from the IRS. Keep the IRS confirmation letter (the CP 575): Medicare contractors ask for a written IRS document confirming your tax ID and legal business name, and the name on every application has to match what the IRS has on file, character for character.
A business bank account in the legal business name. Payment enrollment requires a voided check or bank letter, and Medicare rejects an account that isn’t in the group’s exact legal name. An account opened under a DBA or the owner’s personal name creates a problem you’ll only discover at the EFT step.
A Type 2 NPI for the organization. Apply through NPPES once the EIN exists. Incorporated clinicians need both their individual Type 1 NPI and the new entity’s Type 2; our guide to Type 1 vs Type 2 NPIs covers which one goes where on a claim.
A physical practice location. Medicare requires the address where services are actually delivered, and a P.O. box, commercial mailbox, or drop box won’t be accepted. Commercial payers also want the service address on the application. The signed lease is usually the gating item for the whole project.
Malpractice coverage naming the new practice. Payers want a current certificate of insurance, and many check that the entity, not just the individual, is covered.
Updated provider licenses and DEA registration. State licenses and DEA registration should show the new practice address before you list it with payers.
| Document | Needs first | Where it’s used |
|---|---|---|
| IRS EIN letter (CP 575) | Legal entity formed | Every payer application; legal name must match it exactly |
| Bank letter or voided check | EIN | Medicare CMS-588 and commercial EFT enrollment; account in the legal business name |
| Type 2 NPI | EIN | Group applications, claims billing, payer contracts |
| Signed lease (practice address) | Legal entity | Every application; Medicare rejects P.O. boxes and mailboxes |
| Malpractice certificate | Legal entity | Commercial and Medicaid credentialing; CAQH profile |
| Licenses and DEA at new address | Practice address | CAQH profile and every payer’s primary source verification |
| Updated CAQH profile, re-attested | All of the above | Commercial payers and most Medicaid plans read it directly |
| Ownership and authorized official details | Legal entity | Medicare CMS-855B and group applications |
The Startup Checklist, in Order
The order below is built around one constraint: commercial payers take the longest and accept applications early, while Medicare refuses applications filed too early. So commercial goes first, Medicare goes inside its window, and everything else fills in around them.
Step 1: Build the foundation (four to six months before opening)
Form the entity, get the EIN, open the bank account, sign the lease, and apply for the Type 2 NPI, in that order. Each step needs the one before it. Starting four to six months out isn’t padding; it’s what it takes to have the commercial applications in flight long enough to come back before opening day.
Step 2: Update every provider record to the new practice
Before any application goes out, update each clinician’s NPPES record, CAQH profile, licenses, and DEA registration to the new practice address. NPPES requires changes to be reported within 30 days, and payers compare the address on your application against the NPPES record and the CAQH ProView profile. Re-attest CAQH after the update, since payers read the profile as of the last attestation. A profile that still shows the old group is one of the most common reasons a new-practice application stalls, and an attestation that lapses mid-process freezes commercial review entirely.
Step 3: File commercial applications as soon as the lease is signed
Commercial payers are the long pole, so file with every payer you need on the day you have a tax ID, Type 2 NPI, and practice address. Ask each payer two questions up front: is the panel open for a new group in your specialty and area, and will they credential the group, link existing providers, or both? A payer that says the panel is closed needs a different strategy, covered in our guide to getting into closed payer panels. Our 90-day credentialing timeline shows how to track each one week by week.
Step 4: File Medicare inside the 60-day window
For the group, file the CMS-855B for the new entity, the CMS-855I for each clinician with the reassignment to the group, the CMS-588 for electronic payment, and decide whether the group will be a Medicare participating provider. Don’t file more than 60 days before the effective date on the application, or CMS returns it without processing. The effective date is set by the date the MAC receives the application it approves, with up to 30 days of retrospective billing before that, so a clean filing inside the window covers you from day one. Our breakdown of why CMS returns or rejects applications covers the mistakes that reset that date.
Step 5: Enroll in Medicaid fee-for-service before the managed care plans
If you’ll see Medicaid patients, enroll with the state Medicaid program first, even if every patient you expect is in a managed care plan. Federal rules require the state to screen and enroll every MCO network provider, and an MCO can only keep you in network for 120 days while that state enrollment is pending. Skip the state step and the MCO contract has an expiry date you didn’t know about. The state-by-state details are in our Medicaid provider enrollment guide.
Step 6: Confirm everything before the first patient
Two weeks before opening, confirm for every payer that the group is approved, each clinician is linked to the group’s tax ID with an effective date, and EFT and ERA enrollment is complete. Then run benefits checks on the first week’s patients against the new group’s contracts. Approval letters without linkage dates, or contracts loaded at the wrong address, are far cheaper to fix before the first claim than after the first denial.
What Does Opening Before You’re Credentialed Cost?
Every week a payer isn’t contracted is a week of visits you either can’t bill or bill out of network. Here is an illustrative example: a three-clinician practice sees 25 patients per clinician per week, 60% of them commercially insured, at an illustrative average allowed amount of $95. If the commercial contracts land eight weeks after opening, that’s 45 commercial visits a week and roughly $34,200 in revenue at risk, before counting the patients who reschedule elsewhere rather than pay out of network.
Billing those visits under a clinician’s old group is no workaround. Payers can recoup payments for services by an uncredentialed provider months later, and the old group has no reason to carry your claims. The full math on delays is in our breakdown of what credentialing delays really cost.
Opening in the next six months? Are your payers on track?
We check your entity details, NPI, CAQH, and provider records for the mismatches that stall new-practice applications, so every payer clock starts on time.
Check my launch readiness →Common Mistakes When Credentialing a New Practice
Most new-practice delays trace back to the same handful of mismatches rather than to anything a payer decided. The ones we catch most often when we take over a launch:
- The legal name drifts. “Smith Behavioral Health, PLLC” on the IRS letter, “Smith Behavioral Health” on the bank account, “Smith BH” on the NPI record. Each payer rejects a different variation.
- Old addresses survive in one record. NPPES updated, CAQH not, or the license still lists the old group.
- Medicare goes in too early. The team files everything at once, five months out, and the Medicare application comes back.
- Medicaid MCOs without state enrollment. The MCO contract works for 120 days, then terminates.
- No linkage check. The group is approved, but individual clinicians were never linked to the new tax ID, so their claims deny.
If you’re relocating an existing practice rather than starting a new entity, the steps are lighter; our guide to credentialing after relocating a practice covers that case.
Start the Credentialing Before You Pick the Paint
The payer clocks are the part of opening a practice that can’t be rushed. A lease, a build-out, and an EHR can all be compressed; a commercial payer’s credentialing committee can’t. Mark Wood, our COO, has spent more than 20 years watching practices open on schedule and then wait months to get paid, and the fix is almost always starting the sequence earlier.
MedBillingTech handles new-practice credentialing at a flat $150 per application: entity setup checks, provider record updates, every payer application, and the follow-up until each clinician is linked and billable. If you’re opening in the next six months, start with a free credentialing audit to see what’s ready and what isn’t, or call us at (307) 243-2190. For the full picture across every payer type, see our complete provider credentialing guide.
Frequently Asked Questions
Start four to six months before opening. Commercial payers take the longest, so their applications should go out as soon as the practice has a tax ID, a Type 2 NPI, and a signed lease. Medicare is the exception: its application can’t be filed more than 60 days before the effective date.
No. The old group’s contracts cover services billed under its tax ID at its locations. Billing your new practice’s patients through the old group can trigger recoupment and compliance problems, and it depends on the old group agreeing to carry your claims.
Yes, if it’s a group or any incorporated entity. The organization needs its own Type 2 NPI, and each clinician keeps their individual Type 1 NPI. A sole proprietor practicing under their own name and Social Security number uses only a Type 1.
Yes. Federal rules require the state to screen and enroll every managed care network provider. A plan can contract with you while state enrollment is pending, but only for up to 120 days.
Expect the IRS confirmation of your tax ID and legal name, the Type 2 NPI, a voided check or bank letter in the legal business name, the practice address, a malpractice certificate, each clinician’s license, DEA registration, and an up-to-date CAQH profile. Group applications also ask for ownership and authorized official details.
