You Have the CO. You Still Can't Bill.
A Certificate of Occupancy lets you occupy the building. It does not let you bill for care. Between the CO and your first insurance payment sits a separate stack of approvals: facility licensing (depending on your care model), CLIA for any in-office testing, Medicare and Medicaid enrollment, and commercial payer credentialing and contracting. That chain runs 3 to 6 months, most of it can't start until the building is done, and you control none of the clocks. Budget the gap, and start every step that doesn't need a finished building the day you sign the lease.
The build is finished. The Certificate of Occupancy is framed on the wall. You hand out badges, run a soft-opening lunch, and put a launch date on the calendar. Payroll has started. Rent has been running since the lease commenced. And the first dollar from an insurer is still 90 to 150 days away.
I wrote last month about the gap between "construction is done" and "you can open" — the inspection-to-CO gauntlet. This is the next gap, and almost nobody puts it on the schedule: the stretch between opening the doors and getting paid. The CO is not the finish line. It is the starting gun for a second race.
Why can't you bill the day you get your Certificate of Occupancy?
A CO comes from the city or the local building authority. It certifies one thing: the space is built to code and safe to occupy. That is a conversation between you and the building department, and it is often the only approval you're tracking by opening day.
Getting paid is a conversation with entirely different parties: your state health department, CMS, and every commercial insurer you want to be in-network with. None of them care that the drywall is up, except as a precondition. They each run their own approval, on their own timeline. Their timelines only start once you have an address to attach the application to, so.
A CO is permission to occupy. Licensing and enrollment are permission to get paid. They come from different bodies, on different clocks, and the second set is the one that funds your payroll.
What stands between the CO and your first dollar?
The exact chain depends on your care model and your state, but a clinic taking insurance usually runs some version of this:
The billing gauntlet
- State facility license. Depending on the model and state, you may need a license to operate the facility at all — common for surgical, specialty, imaging, dialysis, PACE, home health, and hospice settings. For the models that require it, this is often the longest pole, and the license application frequently can't be filed until the CO exists.
- CLIA certificate. Run any in-office testing, even a finger-stick glucose or a rapid strep, and you need a CLIA certificate before you can report results. A Certificate of Waiver is quick; moderate- and high-complexity labs take longer.
- Medicare enrollment. Filing the right 855 in PECOS takes 60 to 120-plus days, and for some facility types it requires a state survey or accreditation before billing privileges are granted. Retroactive billing windows are narrow, so when you file matters as much as that you file.
- Medicaid enrollment. A separate process, state by state, often slower than Medicare and easy to forget until a Medicaid patient walks in.
- Commercial credentialing and contracting. Credentialing each provider with each payer runs 90 to 180 days, and getting a signed in-network contract with a fee schedule is a second step behind it. This is usually what gates real revenue.
- DEA registration for the location. Controlled-substance prescribing is tied to the specific address. A new site needs its own DEA registration before anyone prescribes there.
- Ancillary permits. Radiologic equipment registration, mammography certification, a pharmacy license, a lab permit — whatever your services trigger, each is its own approval.
Read that list and the problem jumps out. It is long, it is parallel, and it is sequential at the same time.
Why is the chain so slow?
Two reasons, and they compound. The first is dependency. The license often can't be filed until you have the CO. Medicare enrollment for a facility can't finish until the license (and sometimes a survey) is in hand. Several commercial payers won't finalize a contract until you're Medicare-enrolled. So the steps don't just take time, they take time in order, each one waiting on the one before it.
The second is that you control none of the clocks. A payer's credentialing committee meets when it meets. A state surveyor schedules when they schedule. A Medicare contractor processes when they process. You can submit clean applications early and chase them hard, and you should, but you cannot make a third party move faster than its queue.
The four months nobody budgeted
A pattern I see often: a clinic hits its construction date, gets the CO, and celebrates. The state license application could only be filed once that CO existed, then a required survey scheduled out several weeks, then Medicare enrollment stacked behind the license, then commercial contracts behind that.
The doors were open the whole time. The team was hired and on payroll. Rent had been running since lease commencement. But the clinic couldn't bill an insurer for roughly four months after it opened.
What that gap cost:
- Four months of rent and full clinical payroll against almost no collected revenue
- A cash-flow hole that landed right after the build had already drained reserves
- A founder explaining to the board why "open" and "profitable" were two different dates
How do you compress the gap?
You can't remove the gauntlet, but you can run a lot of it in parallel and start most of it long before the building is done. The mistake is treating licensing and enrollment as a post-opening task. It is a pre-opening workstream that deserves an owner, the same way construction has a project manager.
What to start the day you sign, not the day you open
- Stand up the entity and identifiers now. Legal entity, NPIs (individual and organizational), taxonomy, CAQH profiles for every provider. None of this needs a finished building.
- Begin accreditation prep early if your model needs it for Medicare. It is the slowest dependency, so it should start first.
- Stage the address-dependent filings so the CO triggers them the same week. Have the license application and survey request ready to submit, not ready to start writing.
- File to preserve retroactive effective dates where a payer allows them, so you can bill back to your start of care once approval lands.
- Budget the dark period. Model rent plus full payroll plus carrying costs for the months between CO and steady collections. Plan for revenue to ramp 90 to 180 days after you open, not on day one.
- Give it an owner. One person tracks every application, every dependency, and every queue, and chases them weekly. Credentialing dies in inboxes.
Do this and the two races overlap instead of running back to back. The paperwork is moving while the building goes up, the slow dependencies are already underway when the CO lands, and you open the doors and bill in the same quarter rather than two quarters apart.
Key takeaways
- A Certificate of Occupancy is permission to occupy the building. It is not permission to get paid for care.
- Between CO and first revenue sits a chain — facility licensing (model-dependent), CLIA, Medicare and Medicaid enrollment, and commercial credentialing and contracting — that commonly runs 3 to 6 months.
- The chain is slow because the steps depend on each other and run on third-party clocks you don't control. The license often can't be filed until the CO exists, and enrollment stacks behind the license.
- Start every step that doesn't need a finished building the day you sign: entity, NPIs, CAQH, accreditation prep, and staged applications ready to file the week the CO lands.
- Budget the dark period. Rent and full clinical payroll run for months before insurance cash arrives, so model revenue 90 to 180 days after opening, not on day one.
The Bottom Line
A Certificate of Occupancy is the city telling you the building is safe to use. It is not the state telling you that you're licensed, CMS telling you that you're enrolled, or a payer telling you that you're in-network. Those are different approvals, from different bodies, on different clocks, and most of them only start moving once the building is finished.
Model "open equals revenue" and you run out of runway in the gap. Budget the gap and start the paperwork early, and you can open the doors and bill in the same quarter. The CO ends the construction race. Treat it as the starting gun for the one that funds the business.
Frequently asked questions
How long after a clinic opens can it start billing insurance?
Commonly 3 to 6 months, and sometimes longer. The drivers are commercial credentialing and contracting (90 to 180 days per payer) and Medicare enrollment (60 to 120-plus days, with a survey or accreditation required first for some facility types). Because several of these steps depend on each other, they tend to run in sequence rather than fully in parallel, which is what stretches the timeline.
What is the difference between a Certificate of Occupancy and a clinic license?
A Certificate of Occupancy comes from the local building authority and certifies that the space is built to code and safe to occupy. A clinic or facility license comes from the state health department and authorizes you to deliver a specific type of care at that location. They are separate approvals from different agencies, and for many care models the license application can only be filed once the CO exists.
Do you need a license to operate a healthcare clinic?
It depends on the care model and the state. Many physician-owned practices operate without a separate facility license, while surgical, specialty, imaging, dialysis, PACE, home health, and hospice settings typically require one. For the models that need it, facility licensing is often the longest single step between the CO and first revenue, so confirm your requirement early.
Can you bill Medicare retroactively after enrollment?
Only within narrow limits. Medicare allows a limited retrospective billing window tied to your effective date, which is why filing a clean application early matters as much as filing it at all. Miss the window and the care delivered before approval is simply uncompensated, so treat enrollment timing as a revenue decision, not a paperwork formality.
Opening a Clinic and Worried About the Revenue Gap?
I help healthcare founders and operators sequence the licensing, enrollment, and credentialing chain against the construction schedule, so the doors open and the billing starts in the same quarter. If you have a CO date on the calendar, now is the time to map the path to your first dollar.
Schedule a Strategy Session