When a physician works in a hospital system, the billing department handles everything. Claims go out. Payments come in. The physician sees patients, documents the encounter, and moves on. Credentialing, payer contracts, denial management, accounts receivable — all of it happens in a department the physician may never interact with directly.

When that physician leaves to start or join a private practice, every one of those functions becomes their responsibility. Not eventually. Immediately.

The clinical side of starting a practice gets most of the attention: finding office space, hiring staff, choosing an EHR, building a patient panel. The billing side gets less attention, and that is where new practices run into trouble. The gap between opening the doors and actually collecting revenue can last months if the billing infrastructure is not set up early enough.

What the hospital handled that you now own

In a hospital system, the revenue cycle is managed by teams of coders, billers, credentialing specialists, and AR analysts. In a new private practice, the physician or a small team is responsible for all of it.

Credentialing and payer enrollment. The hospital had contracts with every major payer. Those contracts belong to the hospital, not the physician. When the physician leaves, they need to establish their own payer relationships — or the practice’s payer relationships — from scratch. The hospital’s contracts do not transfer.

Coding and charge capture. In a hospital, professional fee coding and facility coding are often handled by separate teams. In a private practice, the physician or a designated coder is responsible for accurate coding on every encounter.

Claim submission and follow-up. The hospital’s billing department submitted claims, tracked payments, followed up on denials, and managed appeals. In a private practice, someone needs to do this daily or claims age out and money is lost.

Patient billing and collections. The hospital sent patient statements, managed payment plans, and handled collections. The new practice needs its own process for patient balances, especially as high-deductible plans push more costs to patients.

Compliance and audit readiness. The hospital had a compliance department that monitored coding patterns, reviewed documentation, and prepared for audits. In a private practice, the physician needs to build in compliance checks or risk audit exposure.

Credentialing is the longest lead time

The single biggest billing mistake new practice owners make is not starting credentialing early enough.

Credentialing with insurance companies typically takes 90 to 180 days. Some payers are faster. Some, particularly state Medicaid managed care plans, can take longer. The process involves:

  1. Applying to each payer individually. There is no single application that covers all payers.
  2. Primary source verification. The payer verifies medical school, residency, board certification, license status, malpractice history, and other credentials.
  3. Committee review. Many payers have a credentialing committee that meets on a set schedule, adding calendar time.
  4. System loading. After approval, the payer loads the provider into their claims system. This step alone can take 15 to 30 days.

During the credentialing period, the practice cannot bill that payer. If the physician sees an insured patient before credentialing is complete, the claim will be denied. Some payers allow retroactive billing from the application date, but not all.

The implication: start credentialing applications 4 to 6 months before the practice plans to see its first insured patient. If the physician is still employed at the hospital, credentialing for the new practice can begin in parallel.

Medicare and Medicaid enrollment are separate processes

Medicare enrollment is not the same as commercial payer credentialing. The physician needs to enroll the new practice with Medicare through PECOS (Provider Enrollment, Chain, and Ownership System). If the physician was enrolled under the hospital’s group NPI, they need a new enrollment tied to the practice’s Type 2 NPI.

Medicaid enrollment is state-specific. Each state’s Medicaid program has its own enrollment process, and if the state uses managed care organizations, each MCO requires separate credentialing. This mirrors the problem practices face when expanding across state lines — see Cross-State Telehealth Licensing and How It Affects Your Billing for the multi-state version.

The timelines for Medicare and Medicaid enrollment vary but often run 60 to 120 days. Missing the enrollment window means the practice cannot bill Medicare or Medicaid patients during that period.

The revenue gap

New practices should plan for a revenue gap of 3 to 6 months between opening and receiving consistent insurance payments. This is not because the practice is failing. It is the structural result of credentialing timelines and claim payment cycles.

The gap includes:

  • Credentialing lag. Weeks or months before the practice can bill payers.
  • Claim submission to payment cycle. Even after credentialing, most payers take 14 to 45 days to process and pay a clean claim.
  • Denial and resubmission cycles. New practices typically have higher denial rates in the first few months as billing workflows are established. Each denial adds weeks to the payment cycle.

The practice needs enough operating capital to cover rent, staff salaries, supplies, and the physician’s draw during this period. Underestimating the revenue gap is one of the most common financial mistakes new practice owners make.

Choosing how to handle billing

New practices have three options for billing:

Do it yourself. The physician or office manager handles coding, claim submission, denial management, and AR. This works only for very low-volume practices and is usually unsustainable past the first few months.

Hire an in-house biller. The practice employs a dedicated biller or billing manager. This provides control and proximity but requires finding someone experienced with the practice’s specialty and payer mix. If the biller leaves, the practice has a gap.

Outsource to a billing company. The practice contracts with an external billing company that handles some or all of the revenue cycle. This provides continuity and scalability without the overhead of a full-time hire. For a deeper look at what outsourcing involves, see Should You Outsource Medical Billing?

Many new practices outsource billing for the first 1 to 2 years while the patient panel and revenue stabilize, then evaluate whether to bring billing in-house once the volume justifies a full-time hire.

Common mistakes in the transition

  • Not starting credentialing before leaving the hospital. The physician can begin credentialing for the new practice while still employed. Waiting until after resignation adds months to the revenue gap.
  • Assuming the hospital’s payer contracts transfer. They do not. The practice needs its own contracts with every payer.
  • Not applying for a practice NPI. The physician has a Type 1 NPI as an individual. The practice needs a Type 2 NPI as an organization. Some payers require the Type 2 NPI for enrollment.
  • Underestimating the time to get paid. The combination of credentialing lag and claim cycles means the first meaningful insurance payments may not arrive for 4 to 6 months after opening.
  • Choosing an EHR without evaluating its billing capabilities. The EHR should support the practice’s billing workflow, whether in-house or outsourced. Some EHRs have strong billing modules. Others require a separate practice management system or external billing integration.
  • Not setting up a denial management process from day one. New practices that let denied claims pile up without a review process lose revenue they may never recover.

How Neobill can help

Neobill works with private practices from startup through stabilization. The free audit reviews the practice’s credentialing status, payer enrollment, EHR billing setup, and early claim patterns to identify gaps before they become lost revenue. For practices still in the planning stage, the audit can help set the billing timeline alongside the clinical and operational buildout.