A new medical practice should begin credentialing and enrollment 120 to 150 days before opening day, because commercial payer timelines commonly run 90 to 120 days and everything else depends on entity paperwork that must come first. The critical path runs: legal entity and EIN, then NPIs (Type 1 for each provider, Type 2 for the practice), then CAQH profiles, then Medicare enrollment through PECOS, Medicaid, and commercial payer applications in priority order. Miss the window and you open your doors seeing patients you cannot yet bill for.
This checklist is organized chronologically, counting down to opening day. Timelines are typical industry ranges, not guarantees, so build slack wherever your state or payer mix is known to run slow.
150 to 120 days out: entity and identifiers
- Form the legal entity. Everything downstream, including bank accounts, payer contracts, and tax setup, keys off the entity name. Get it exactly right, because inconsistencies between the entity documents, the W-9, and payer applications cause rework later.
- Obtain the EIN from the IRS for the new entity, and generate a W-9. Payers will match your applications against this document character for character.
- Apply for NPIs. Each rendering provider needs an individual Type 1 NPI (most already have one from training). The practice entity needs its own Type 2 organizational NPI. Claims are billed with both: the Type 2 identifies who gets paid, the Type 1 identifies who rendered care. Choose taxonomy codes deliberately, since payers use them in enrollment.
- Confirm state licensure and DEA registration for every provider in the practice state, including any pending license transfers. A pending license blocks everything behind it.
- Secure malpractice coverage and obtain the certificate of insurance. Nearly every application requires it.
120 to 90 days out: CAQH and government payers
- Build or update each provider’s CAQH profile with the new practice address, Type 2 NPI, tax ID, and month-and-year work history with no unexplained gaps. Upload current documents and attest. Most commercial payers will pull from this profile, so it must be finished before commercial applications go out.
- Enroll the practice and providers with Medicare via PECOS. The group enrolls, each provider enrolls or revalidates, and each provider reassigns benefits to the group. Medicare processing is often faster than commercial, commonly 30 to 60 days for clean files, and Medicare generally permits billing back to the effective date, which gives you some protection if timing slips.
- Start state Medicaid enrollment if Medicaid patients will be part of your mix. State timelines vary widely, and managed Medicaid plans usually require the state enrollment first, so this belongs at the front of the queue, not the back.
- Set up EFT and remittance banking details so payer payments have somewhere to land when effective dates arrive.
90 to 60 days out: commercial payers in priority order
- Rank your commercial payers by expected patient volume in your market, using local employer coverage and referral patterns as your guide. Submit to all of them, but chase the top three or four hardest, since they will drive most of your early revenue.
- Submit participation applications to every target commercial plan, authorizing each to access CAQH. Confirm receipt and completeness with each payer within two weeks, in writing where possible.
- Review contracts and fee schedules as they arrive. Contracting is a separate step after credentialing approval, and unsigned agreements sitting in an inbox are a silent source of delay.
- Start a payer tracker with one row per provider per payer: date submitted, status, payer contact, next follow-up date. Weekly follow-up is the single cheapest way to keep files moving.
60 to 30 days out: operations that depend on enrollment
- Configure the practice management system with payer IDs, NPIs, tax ID, and place of service, and complete claims clearinghouse and payer portal setup, including ERA and EFT enrollment per payer.
- Test the billing workflow end to end before real claims depend on it, or line up a billing partner so claims go out correctly from day one.
- Verify effective dates in writing as approvals arrive, and load them into the scheduling system so front desk staff know which plans each provider can see.
- Apply for hospital privileges now if any provider will admit or perform procedures at a facility; that process runs on its own clock.
30 days out to opening: protect the revenue
- Schedule around effective dates. Where a payer is not yet effective, either hold those appointments, use self-pay arrangements the patient agrees to in advance, or confirm the payer’s policy on retroactive effective dates before booking.
- Hold claims cleanly for payers still pending, with a dated log, and release them the day effective dates land. Watch timely filing limits on anything held.
- Re-attest CAQH if 120 days have passed since the last attestation, and calendar the recurring cadence permanently.
- Escalate stragglers. If a major payer is still silent at 30 days out, escalate through provider relations, and consider whether opening volume needs to shift toward payers that are ready.
What does getting this wrong cost?
The cost of a missed window is care you deliver but cannot bill, or bill out-of-network at reduced rates. There is no reliable way to recover most of it after the fact, and workarounds like billing under another provider’s number create compliance risk. Starting 120 to 150 days out, with a tracker and weekly follow-up, is the whole game. AMS Solutions has been doing this work since 1992, physician-founded and serving practices in all 50 states, and a free credentialing consultation before you commit to an opening date is a cheap way to pressure-test the plan. New practices can also get a broader launch review through our free billing analysis, with findings in 5 business days and no contract required.
Frequently Asked Questions
What is the difference between a Type 1 and Type 2 NPI?
A Type 1 NPI identifies an individual provider and follows them for their entire career. A Type 2 NPI identifies an organization, such as your new practice entity. A new practice needs its own Type 2 even if every provider already has a Type 1, because claims identify both the rendering provider and the billing entity.
Which payer should a new practice enroll with first?
Start Medicare, Medicaid, and your highest-volume commercial payers all at once, since they process independently. If forced to prioritize follow-up effort, chase whichever payers will represent the most opening-month volume in your specific market.
Can we see patients before payer effective dates and bill later?
For Medicare, retroactive billing to the effective date is generally permitted once enrollment is approved. Many commercial payers will not pay for dates of service before the effective date, so confirm each payer’s policy in writing before scheduling those patients.
Should a new practice outsource credentialing or do it in-house?
It depends on staff bandwidth and experience. The work is not conceptually hard, but it punishes inexperience with weeks-long delays, and a new practice launch is the worst time to learn payer quirks. An experienced partner mainly buys you speed and fewer restarted applications.
