Every spring the same conversation happens. A practice signs a new physician finishing residency on June 30, agrees on an August 3 start date, and asks in mid-May whether the credentialing "will be done by then." The honest answer is: Medicare, probably; the state Medicaid program, maybe; the commercial payers, some of them; and at least one large payer will still be pending in October.
Credentialing timelines have not improved much. Commercial payers commonly quote 90 to 120 days from a complete application, and complete is the operative word. Medicare through PECOS is often faster, 30 to 60 days when nothing is flagged. Medicaid varies by state from a few weeks to several months, and managed care plans within Medicaid add their own step after the state approves. If the process started in March, an August start is comfortable. If it starts in May, it is not.
Here is what the timeline looks like, what to do if you are already behind, and how to handle the weeks when the new provider is seeing patients whose claims cannot yet be billed under their own name.
Key takeaways
- The state license drives everything. Most commercial payers will not start until it is in hand, and license applications can take 60 to 90 days.
- Medicare can be retroactive up to 30 days before the application was received; most commercial payers are effective on approval. Ask each payer in writing.
- Prioritize payers by the new provider's expected patient mix, not by which application is easiest.
- Hold claims, schedule around pending payers, use incident-to only where it genuinely fits, and never bill under another provider's NPI.
- Estimate the cost of the gap in dollars. It is the number that gets next year's process started in March.
What has to exist before anything can be submitted
Most delays we see are not payer delays. They are missing pieces on the provider's side. For a residency graduate:
- An unrestricted state medical license in the practice's state. Many graduates hold a training license that does not qualify. License applications in some states take 60 to 90 days; this is the item most often on the critical path.
- A DEA registration for the practice address. It cannot be applied for until the state license is issued, and it takes four to six weeks.
- An individual NPI with the correct taxonomy. Most residents already have one; verify it is not registered to the training hospital's address.
- A CAQH ProView profile that is complete, attested within the last 120 days, and authorizes the payers you will enroll with.
- Board certification status or eligibility, with dates. Payers accept board-eligible for a defined period after training; the period varies.
- Malpractice coverage with a certificate naming the practice, effective on the start date.
- Work history with no unexplained gaps of more than 30 days, and hospital privileges if the payer requires them.
Collect these with a single checklist sent to the provider the day the offer letter is signed, with a two-week return date. In our experience the items that come back last are the malpractice certificate (the carrier will not issue it until the start date is firm) and the explanation for any gap in the work history. Ask for both early and follow up weekly.
The realistic timeline
| Step | Typical duration | Start by (for an August 3 start) |
|---|---|---|
| State license application (if not already held) | 60 to 90 days | Early March |
| DEA registration | 4 to 6 weeks after license | As soon as license issues |
| CAQH profile build and attestation | 1 to 2 weeks | April |
| Medicare enrollment (CMS-855I and CMS-855R via PECOS) | 30 to 60 days | May |
| State Medicaid enrollment | 2 weeks to 4 months, by state | April or May |
| Commercial payer credentialing and contracting | 90 to 120 days from complete application | April |
| Medicaid managed care plan linkage | 2 to 6 weeks after state approval | Follows Medicaid |
Two things about this table. First, Medicare's effective date can be retroactive up to 30 days before the application was received if the provider met all requirements on that date, so a submission in early July can cover an August start. Second, most commercial payers will not begin credentialing until the license is in hand, which is why the license drives everything.
If you are already behind
Call the payers. Several large commercial payers offer expedited credentialing for providers joining an already-contracted group, and some will honor a "delegated" or "provisional" status. Ask, in writing, and record the representative's name and the reference number. Ask specifically whether the effective date will be the approval date or the application date; the answer differs by payer and matters for every claim in between.
Prioritize. Pull the practice's payer mix and start with the three payers that cover the most patients the new provider will see. A pediatrician joining a practice that is 55 percent Medicaid needs the Medicaid enrollment first, not the small commercial plan that is 3 percent of visits.
Track it visibly. A single spreadsheet with one row per payer: application date, confirmation number, last contact, next follow-up date, status, effective date. Follow up every two weeks by phone, not portal message, and write down what was said. Applications that nobody calls about sit at the bottom of the payer's queue; applications with a fortnightly call tend to move.
Billing during the gap
This is where practices get into trouble. The options, in order of how comfortable we are with them:
- Hold the claims. If a payer will backdate the effective date to the application date, hold the new provider's claims and release them on approval. Track the hold queue by payer and watch timely filing; a 90-day filing limit and a 120-day credentialing process do not fit together, and you may need to submit, take the denial, and appeal with the approval letter.
- Schedule around it. For the first weeks, schedule the new provider with patients whose payers have approved, and route others to credentialed colleagues. Front desk needs a simple grid: provider by payer, approved or pending, updated weekly.
- Incident-to and split or shared billing. Incident-to applies to Medicare Part B in the office setting when a credentialed physician is present in the suite and established the plan of care; it does not cover new patients or new problems, and it does not apply to a physician's services at all in most payers' reading. Commercial payers often do not recognize incident-to. Use it only where it genuinely fits and never as a general workaround.
- Do not bill under another provider's name. Billing a service under the NPI of a physician who did not perform or directly supervise it is a false claim. We see it suggested every summer. Say no.
A worked example of what the gap costs
Take a new internist starting August 3 with an expected 300 visits a month once ramped, at an average allowed of $140, so about $42,000 in monthly charges at full speed and perhaps $25,000 in August. Suppose Medicare (30 percent of the panel) is approved with a retroactive effective date, Medicaid (15 percent) approves in mid-September with an effective date of approval, and two commercial payers covering 40 percent of the panel approve in late October, effective on approval, while a third at 15 percent is still pending in November.
| Payer group | Share of visits | August to October charges | Outcome |
|---|---|---|---|
| Medicare | 30% | About $30,000 | Billed after approval with retroactive date |
| Medicaid | 15% | About $15,000 | Visits before mid-September unbillable; about $6,000 lost |
| Two commercial payers | 40% | About $40,000 | Visits before late October unbillable unless rescheduled; up to $30,000 at risk |
| Third commercial payer | 15% | About $15,000 | Still pending; scheduled to colleagues or lost |
Scheduling around the pending payers recovers most of the commercial exposure, because those patients see a colleague instead. But the practice hired the new physician to add capacity, and the colleagues are already full. In our experience the realistic loss for a late start is somewhere between $15,000 and $40,000 for one physician, before counting the staff time spent on holds and appeals. That figure, shown to the owners, is what gets next year's process started in March.
Nurse practitioners and physician assistants
The same steps apply, with a few differences: collaborative practice or supervision agreements where the state requires them, and some commercial payers that do not credential advanced practice providers individually and instead bill them under a supervising physician. Find out which of your payers does which before the start date, because the claim form is different.
Our credentialing and provider enrollment team runs these timelines for practices every summer and reports payer-by-payer status weekly. Rates are on the pricing page.
Questions we hear
Can the new provider see patients before credentialing is done?
Seeing patients is a licensure and privileging question, not a credentialing one. Billing for those visits is the problem. Use the options above and keep a list of every visit that is being held.
The provider was credentialed at their residency hospital. Does that carry over?
Hospital privileging and payer credentialing are different processes. Payer enrollment is tied to the billing entity, so a new group means a new application for each payer, though the CAQH profile carries over.
How much should we budget for the gap?
Estimate the new provider's expected monthly charges, multiply by the payer mix share that will still be pending at the start date, and assume a portion of that will be lost to timely filing or denied appeals. The worked example above is the shape of the calculation; your payer mix and start date change the numbers.
What to do this month
- Send every incoming provider the document checklist today, with a two-week return date.
- Confirm the state license status and, if not yet issued, call the board for a timeline.
- Build the CAQH profile and attest it as soon as the license number exists.
- Submit Medicare and Medicaid enrollments, then the top three commercial payers by the new provider's expected patient mix.
- Start the tracking spreadsheet and set fortnightly follow-up calls.
- Give the front desk the provider-by-payer grid before the first day, and update it weekly.
