A new physician joins your practice. They’re credentialed with your hospital, malpractice coverage is in place, their DEA number is active. But four months later, they still can’t bill Medicare or Medicaid — because the credentialing and enrollment process is incomplete.

Every patient they’ve seen during that time has been either billed under a supervising physician, billed incorrectly, or not billed at all. This scenario plays out in practices across the country every month. Credentialing delays are not an administrative inconvenience — they are a direct, quantifiable revenue catastrophe.

What Is Provider Credentialing and Why Does It Take So Long?

Provider credentialing is the process by which insurance payers verify a provider’s qualifications, licensure, training, and malpractice history before authorizing them to bill — and it takes so long because the process is heavily manual, involves multiple independent verification sources, and has no standardized timeline across payers.

Medicare provider enrollment through PECOS currently takes 60–90 days under standard processing. Medicaid enrollment varies by state — from 45 days in streamlined states to over 6 months in states with manual processing. Commercial payer credentialing adds another 60–120 days per payer.

For a new provider seeing 15–20 patients per day, each day without billing capability represents $1,500–$3,000 in claims that cannot be submitted under their NPI.

What Are the Most Common Credentialing Mistakes That Cause Delays?

The most common credentialing mistakes that cause delays are incomplete applications, outdated or missing documents, NPI mismatches, failure to follow up on pending applications, and not initiating the process early enough before a provider’s start date.

The most preventable of these is timing. The credentialing process for a new provider should begin the moment a signed employment contract is in place — ideally 90–120 days before their intended start date. Practices that begin credentialing at onboarding lose months of billing capacity.

Can a Provider Bill Under a Supervising Physician While Credentialing Is Pending?

In some situations, a provider can temporarily bill under a supervising physician’s NPI during the credentialing period — but this carries significant compliance risk and is only appropriate for mid-level providers in defined incident-to billing arrangements.

Billing under another physician’s NPI for a service actually rendered by a non-enrolled provider is a compliance violation that can result in recoupment and exclusion. Many practices do this unknowingly. Legal and compliance guidance is critical before using any workaround billing arrangement.

How Can Practices Accelerate the Credentialing Process?

Practices accelerate credentialing by submitting complete, error-free applications as early as possible, using CAQH ProView to maintain a universal provider profile, following up with payers weekly after submission, and designating a dedicated credentialing coordinator.

CAQH ProView is the single most impactful tool for reducing credentialing timelines. When a provider’s CAQH profile is current and attested, most commercial payers can pull verification data directly, eliminating weeks of back-and-forth. A lapsed CAQH attestation is one of the most common causes of delays.

What Is Re-Credentialing and When Does It Need to Happen?

Re-credentialing is the periodic re-verification of an enrolled provider’s credentials, typically required every two to three years by most payers, and failure to complete it on time results in automatic termination of enrollment — meaning claims submitted after that date are denied.

Re-credentialing deadlines are easy to miss in a busy practice. A credentialing management system with automated deadline tracking prevents the catastrophic scenario where a high-volume provider’s enrollment lapses unnoticed — sometimes for weeks — before the first denial surfaces.

Frequently Asked Questions

Q: How long does Medicare provider enrollment take in 2026?

A: Standard Medicare enrollment through PECOS currently averages 60–90 days. Internet-based PECOS applications process significantly faster than paper Form CMS-855.

Q: Can a practice bill for services retroactively after credentialing is approved?

A: Medicare allows retroactive billing to the application receipt date in many cases — one of the strongest arguments for submitting the application as early as possible. Commercial payers vary; most allow 30–90 days.

Q: Does every payer require a separate credentialing application?

A: Yes — each payer maintains its own credentialing process. CAQH ProView streamlines this by allowing payers to pull standardized data, but each payer still controls its own enrollment timeline and requirements.

Sources: CMS PECOS Enrollment, CAQH ProView, AMA, InvicieQ Billing Challenges 2026.