Opening a Medical Practice in the U.S.? Here’s The Credentialing and Cash Flow Checklist Doctors Need
You check your payer portal more than you check your email. And we are not exaggerating it because that’s just what the first few months of owning a practice usually look like. Patients are coming in, your staff is doing everything right, and somewhere in a queue you can’t see, an application with your name on it is sitting untouched while your rent comes due on schedule anyway.
There’s a specific kind of tiredness that comes from running a full practice and an empty bank account at the same time, and it usually starts around week six, right about when “in process” stops sounding like an update and starts sounding like a wall. That wall has a name.
Credentialing.
But before it can even start, there’s a step underneath it that most new owners forget to count into their timeline at all, and that’s where the real planning has to begin.
Your State License Comes Before Any of This
You can’t submit a single credentialing application until you’re holding an active, unrestricted medical license in the state where you’ll practice. That makes licensing the true starting line, the first thing that has to happen before anything else on this checklist can even be attempted.
If you’re only licensing in one state, this part is usually familiar territory, something you’ve already mapped out. However, it gets more interesting if you’re weighing more than one state, or moving from where you trained, because now the timeline depends on where you land. The AMA reports that the Interstate Medical Licensure Compact now covers 44 states plus District of Columbia and Guam, and that the ‘letter of qualification’ step at the center of it takes 38 days on average, with more than half of applicants clearing it in under a month.
Outside the compact, or in a non member state like California, you’re looking at a slower, fully separate process, and that’s the kind of detail worth building into your opening date long before you sign anything. This is the piece to move first, because everything past this point depends on it.
Let Credentialing Set Your Opening Date, Not Your Lease
Once your license is in hand, the next clock starts, and it’s the one most new owners never adjust their opening date around. You probably picked an opening date the way most people do, by looking at when your buildout would be finished and your staff would be trained, which feels reasonable enough until you see how credentialing actually behaves.
Credentialing runs on its own timeline entirely. In an MGMA poll of medical group leaders, denials and appeals came back as the single biggest source of revenue cycle leakage practices report today, cited by 48 percent of respondents, with credentialing related denials and incomplete enrollment named directly among the causes. That’s the clock worth building your opening date around, and once you start treating it that way, the phone calls that come next make a lot more sense.
The Calls You’ll Make, and What They Actually Mean
If you’ve made it past the first month, you already know the script. You call the payer, they tell you it’s ‘in process,’ and the line goes quiet again, leaving you to guess at what’s actually happening behind that phrase. A few specific mechanics are usually sitting behind it, and knowing them turns a vague update into something you can actually chase down.
- Your CAQH profile has an expiration clock of its own. Most commercial payers pull your information from CAQH, now run by DataSpring, instead of collecting it separately. DataSpring’s guidance confirms the profile must be re-attested every 120 days, or every 180 days if you practice in Illinois, and missing that window stalls every payer relying on it at once.
- CMS wants your ownership structure spelled out. On the Medicare side, CMS 855I, the enrollment application itself, requires you to disclose anyone with 5 percent or more ownership or control interest in your practice. Getting that section wrong, or leaving it incomplete, is a documented part of what CMS reviews before an application can move forward.
- Your address has to match everywhere it appears. Your state license, your NPI record, your business registration, every payer application all need to line up, because a reviewer working from a mismatched file has no easy way to confirm you are who you say you are.
- Gaps and lapses get flagged. An expired malpractice certificate or an unexplained employment gap can hold up a file that otherwise looks complete, since payers verify continuous coverage and history as part of the same review.
Every one of these takes a phone call and a resubmission to fix once you find it. The real cost happens earlier than that, when a file stalls and nobody notices until someone finally thinks to check on it. That stretch of waiting is exactly what you’re working through until one of those calls finally brings good news.
What You’ll Actually Get Paid for Once You’re Approved
Eventually one of those calls ends differently, and your approval letter shows up. It feels like the finish line, but what you actually get paid for those earlier visits depends on what happens next.
Medicare. Section 424.520 sets your effective date as the later of your application filing date or the date you began furnishing services at that location. From there, section 424.521 allows retrospective billing for up to 30 days before that effective date, or up to 90 days if a presidentially declared disaster kept you from enrolling sooner, which is a fairly narrow exception in practice.
Medicaid. Medicaid.gov confirms a federal default of up to three months of retroactive coverage before the application date, though individual states can obtain waivers narrowing that window, so the real answer depends on your specific state’s program.
Commercial payers. These are governed by their own contracts, and terms vary enough between payers that reading your specific participation agreement matters more than any general rule. Some backdate to your application date, some only to the approval date, and there’s no way to know which without checking.
Given all three, the safest assumption going in is that visits before your effective date might not be recoverable, especially with commercial payers, which brings the conversation to a bigger question about what all this uncertainty costs at scale.
What Delay Costs the System, in Current Numbers
That uncertainty about what’s recoverable is really a symptom of a bigger administrative gap, one that has a dollar figure attached to it at the national level.
The CAQH Index, now published under DataSpring, puts a number on it. U.S. healthcare avoided an estimated $258 billion in administrative costs in 2024 through electronic transactions, and the same report identifies a remaining $21 billion savings opportunity sitting in processes that stay manual, the same category of work as a staff member calling a payer to check on a stalled application.
Every hour spent chasing a file by phone instead of through an automated check is part of that gap, and your practice is paying its share of it whether you notice or not, which is exactly why the reserve you build for this stretch matters as much as it does.
Size Your Reserve to the Wait You’re About to Live Through
Which brings the conversation to what all of this costs you directly. You can plan the equipment order and the buildout on a spreadsheet, since those are one time costs with a clear number attached, and that part tends to feel manageable. Harder to sit with is months of payroll and rent going out while insurance revenue sits close to zero, which is exactly the stretch most budgets forget to plan for.
Before you sign a lease, work through these questions, since the answers shape everything that follows.
- How many full months of payroll, rent, and supply costs can you cover before your first insurance payment lands?
- In those early months, how much of your patient volume comes from payers that pay in weeks versus payers that take months?
- Does your reserve account for credentialing related denials as a real, currently documented risk, per MGMA poll data, rather than an edge case you’re hoping to avoid?
There’s no single verified national figure for exactly what a new practice needs in reserve, since it depends heavily on specialty and location, but what the data above does support is the shape of the risk. Credentialing and enrollment problems remain, by practices’ own report this year, the leading driver of lost revenue in the cycle, which is worth sitting with before you decide how much of that risk you’re willing to carry.
Some Owners Skip Part of This Wait on Purpose
If that reserve math looks uncomfortable, there’s a way some practices shrink the problem instead of just budgeting around it. Taking only self pay patients and PPO plans, while staying out of capitated contracts, HMOs, and Medicaid, shortens the credentialing timeline considerably, since you’re no longer sitting in every payer’s queue at once.
The tradeoff is that it narrows who can walk through your door to people who can pay out of pocket, which fits wellness and concierge style practices better than most others. If this is even a possibility for your specialty, it’s worth deciding before you build your cash plan, since it changes both your reserve size and how much of the retroactive billing rules above even apply to you, and it changes what happens after you’re approved too.
The Approval Letter Isn’t the End of the Risk, It Just Changes Shape
For everyone else riding out the full timeline, getting enrolled doesn’t close the loop the way it feels like it should.
The risk simply shifts from “am I in network yet” to “is this claim getting paid.” That same MGMA poll data found that denials and appeals remain the single largest reported leak in the revenue cycle this year, ahead of front end issues, billing and collections, and coding combined, which is exactly why your billing and EHR systems need to be tested and working before your first credentialed claim goes out. Getting that part right before opening day protects the reserve you spent months building.
You Don’t Get to Close This File and Move On
That ongoing risk has a twin on the paperwork side, and it’s the part that’s easiest to forget once the stress of opening day fades. It’s tempting to treat your approval letter as the finish line and file everything away, but payers see it differently.
NCQA standards require recredentialing every three years, with no grace period once that window closes, and your CAQH profile keeps needing that same 120 day re attestation for as long as your practice is open. Treating the file as a standing responsibility, rather than a task you finish before opening day, sets up everything that comes after.
Line Everything Else Up Behind This Clock
Once you’ve internalized that the file never really closes, the rest of your planning gets simpler, because everything else can now line up behind that same clock.
- Sign your lease early enough that your address is locked before applications go out. Moving locations after submitting means every payer file needs updating from scratch, which resets a clock you’ve already been running for weeks.
- Time your hiring so billing and front desk staff are trained and ready by the time your first claims go out, so they’re in place the moment there’s work for them to do.
- Pace your loan draws or reserve spending against the credentialing timeline itself, treating credentialing related denials as a documented current risk per MGMA’s poll, since that’s the number your budget should actually be built around.
What It Comes Down To
Put all of that together and the shape of the problem is pretty consistent from the license application to the third year of recredentialing. Nobody hands you a warning label before you sign your lease that says the hardest part is getting paid for the patients you’re already seeing, and that warning would have saved a lot of owners a lot of stress. A retroactive billing rule that recovers less than most owners assume, a revenue cycle leak that practices themselves still name as their biggest problem this year, and a recredentialing cycle that never fully ends, all point toward the same conclusion.
Get your license and your credentialing date right. Know what you can and can’t recover once you’re approved. Build a reserve around numbers that come from current regulations and current association data, and let that foundation carry the rest of what opening a practice asks of you.
FAQs
Can I start seeing patients before credentialing is finished?
You can, though in most cases you can’t bill insurance for those visits until enrollment clears. Section 424.521 allows a 30 day retroactive window for Medicare, and that’s a fairly narrow exception, since commercial payers set their own terms entirely.
Will I get paid for visits from before my effective date once I’m approved?
Sometimes, though, it’s best not to count on it. Medicare allows up to 30 days of retroactive billing under section 424.521, Medicaid’s federal default is up to three months per Medicaid.gov but varies by state waiver, and commercial payers are governed by their own contract terms.
Is credentialing still a major source of lost revenue in 2026?
Yes. MGMA poll data from January 2026 found denials and appeals are the leading reported revenue cycle leak this year, with credentialing related denials named specifically among the causes.
Does credentialing ever end?
No. NCQA standards require recredentialing every three years with no grace period, and DataSpring guidance confirms the CAQH re- attestation cycle still runs every 120 days for the life of your practice.
Divan Dave is the Founder and CEO of OmniMD, a pioneering healthcare IT company he established in 2002. With over two decades of leadership, Mr. Dave has been instrumental in transforming traditional care delivery into modern, data-driven digital health systems.