The honest answer to "how long does credentialing take" is 60 to 180 days, and the range is that wide because the variables are real.
What follows is how the time is actually spent, and where practices lose weeks they did not need to lose.
Before anything is submitted
Document collection: one to three weeks. This is entirely within the practice's control and it is where most avoidable delay happens.
The pack is long and boring: current licence, DEA registration, board certification, malpractice face sheet with current dates, diploma and residency certificates, CV in month-and-year format with no unexplained gaps, government ID, and NPI confirmations.
Two items cause most of the trouble. Malpractice face sheets go stale — a policy renewing next month means submitting a certificate that expires during review. And CV gaps: any break of more than 30 days needs an explanation, and reconstructing it years later takes time.
CAQH build and attestation: one to two weeks. Most commercial payers pull from CAQH rather than reading your application, so a profile that is incomplete or un-attested stalls everything downstream. It also requires re-attestation every 120 days, which is a deadline that outlives the initial credentialing.
Then the payers
Medicare (PECOS): 30 to 90 days. Often the fastest, and the most literal. Applications are returned for mismatched addresses, missing signatures and inconsistencies between the application and the NPI record. A returned application resets the clock.
Medicaid: 60 to 180 days. Varies enormously by state, and in most states enrolling with the state programme is only step one — each managed care plan then has its own process.
Commercial plans: 60 to 180 days. The nominal committee cycle is often quoted as 90 days. The real duration depends almost entirely on whether anyone follows up. An application sitting in a queue with a missing item nobody flagged will sit there indefinitely.
Hospital privileging: 60 to 120 days, and it runs on committee meeting dates, which means missing a cut-off can cost a full month regardless of how complete the file is.
The contract, after approval
Being credentialed is not the same as being contracted. Approval is followed by a participation agreement and a fee schedule, and the effective date is what determines when you can bill.
This is the point to read the fee schedule rather than sign it. A rate agreed here runs for the life of the contract, and reviewing it costs days against years of consequence.
Where the time is really lost
In descending order:
- Starting too late. Applications submitted a month before opening guarantee a revenue gap.
- No follow-up cadence. Applications do not progress on their own. A fixed contact schedule is the single biggest determinant of total elapsed time.
- Returned applications. Each return costs weeks. Accuracy at submission is cheaper than speed.
- CAQH lapses. An un-attested profile stalls every commercial application simultaneously.
- Treating it as one project. Each payer is a separate timeline with separate requirements and separate deadlines.
Planning backwards
For a new provider or a new practice, work backwards from the date you intend to see patients:
- Six months out — collect documents, build CAQH, confirm which payers matter
- Five months out — submit commercial and Medicaid applications
- Four months out — submit Medicare, begin the follow-up cadence
- Two months out — review contracts and fee schedules as approvals arrive
- One month out — confirm effective dates in writing and set the billing system up accordingly
Can you bill before the effective date?
Generally no. Some payers permit retroactive effective dates in defined circumstances — Medicare has provisions in specific situations, and some commercial plans will backdate on request. It is worth pursuing where policy allows, and it is not something to plan around.
The claims you submit for an unenrolled provider will deny with CO-B7, and if the enrolment later completes with a prospective effective date, those claims do not become payable.