Credentialing, contracting, and enrollment: what’s the actual difference?

If you’ve started researching how to accept insurance as a therapist, you’ve probably run into these three terms already and probably seen them used almost interchangeably. They’re not the same thing. Confusing them is one of the most common reasons new clinicians experience billing delays, unpaid sessions, or gaps in getting listed in payer directories.

This post breaks down each one clearly, shows you how they connect, and walks you through what to expect and when.

Why any of this matters

According to SAMHSA’s 2024 National Survey on Drug Use and Health, only about half of adults with any mental illness received treatment in 2024. Access is the central problem, and limited availability of in-network therapists is a significant part of that. 83% of the therapists surveyed in our Future of Therapy report believe inadequate insurance coverage is a major obstacle to accessing care.

For clinicians starting out, accepting insurance can expand who you’re able to serve. But before you can bill a single payer, you have to navigate a multi-step administrative process. Understanding the terminology is the first step.

Credentialing: Proving you’re qualified

Credentialing – sometimes called ‘paneling’ – is the process payers use to verify that you’re qualified to provide care before listing you as an in-network therapist. It’s how an insurance company confirms that you hold a valid license, carry malpractice insurance, have the education and experience you say you do, and meet their specific participation requirements.

You go through credentialing separately with each payer, and each one runs its own review and makes its own approval decision. That said, most major commercial payers use a centralized platform called the CAQH Provider Data Portal, which cuts down on repetitive paperwork. You enter your professional information once and authorize each payer to access it, instead of filling out the same forms from scratch every time. CAQH doesn’t get you approved anywhere on its own. It just means your information is in one place when each payer goes looking for it.

Over 2.5 million providers actively use the platform, and it’s required by nearly all major payers, including Blue Cross Blue Shield, Aetna, and UnitedHealthcare.

To complete credentialing, you’ll typically need:

• A valid state license in good standing

• Your NPI (National Provider Identifier) – a unique 10-digit number issued free through the federal NPPES registry

• A completed CAQH ProView profile

• Malpractice insurance documentation

• Work history and education verification

• A W-9 or Tax ID number

Once you apply, the payer’s credentialing department verifies each item, often by contacting licensing boards and other primary sources directly. Your file then goes to a credentialing committee for review and approval.

Credentialing typically takes 90 to 150 days from the time you submit your application, and it can stretch to 4-6 months depending on the payer and how complete your documentation is.

Credentialing has a reputation for being complicated, but for a solo or small-group practice, managing it yourself is entirely doable, especially once you’ve gathered your documents and set up your CAQH profile. Doing it yourself keeps costs down and means you stay close to your own data, which matters for keeping re-attestation deadlines on track later. And if you leave a group practice, you’re still credentialed and can start working sooner.

That said, if you’re juggling licensure, clients, and a practice launch at the same time, a credentialing service can take the follow-up work off your plate. For solo clinicians and small practices, general credentialing services that specialize in mental health providers are worth looking into.

If you’re building a larger group practice or onboarding multiple clinicians, a platform like Exydoc, which integrates credentialing and provider data management with your broader practice operations, is better suited to that scale.

Important: Don’t see clients expecting insurance reimbursement until your credentialing is officially approved and your effective date is confirmed. Sessions provided before your effective date generally won’t be covered.

Contracting: Agreeing to the terms

Once credentialing is approved, contracting begins. This is when the payer sends you a formal participation contract, which is a legal agreement that governs your relationship with the insurance company. 

The contract covers: 

• Your reimbursement rate (how much the payer will pay per session type or CPT code) 
• Timely filing limits (the window you have to submit claims after a session) 
• Billing and documentation requirements 
• HIPAA compliance obligations 
• The payer’s right to audit your records 
• How disputes or denied claims are handled 

Contracting is not automatic: you have to review the contract, agree to the terms, and sign it. Before you do, read it carefully. Some therapists in high-demand specialties or geographic areas have successfully negotiated higher reimbursement rates than the initial offer. It’s always worth asking, even if the answer is no.

Keep a signed copy for your records. You’ll want it if billing disputes come up later. 

Contracting typically begins 30 to 60 days after credentialing approval and can be completed relatively quickly once you return a signed contract.

Enrollment: Registering with government programs

Enrollment is a specific term for the process of registering with a government-run health program – primarily Medicare or Medicaid – to bill them directly for services. It’s related to credentialing, but it’s a separate administrative track.

Medicare enrollment

Medicare is a federal program, so enrollment is handled through a single federal system: PECOS – the Provider Enrollment, Chain, and Ownership System, managed by the Centers for Medicare and Medicaid Services (CMS). PECOS is the online platform where you submit your enrollment application, upload supporting documents, and manage your Medicare participation over time.

Enrolling in Medicare is not optional if you want to bill it because you must be enrolled to receive Medicare reimbursement for services. If you choose not to enroll, you must formally opt out by submitting a Medicare Opt Out Affidavit. Each Medicare client would then need to sign a private pay agreement with you.

Medicare charges no application fee for most mental health clinicians (including psychologists, clinical social workers, and licensed counselors). Medicare processing often takes 60-90+ days.

Medicaid enrollment 

Medicaid is state-administered, which means the process varies by state. Contact your state Medicaid office directly for enrollment requirements, application forms, and timelines specific to your location. Generally, you must be enrolled with Medicaid before you can receive reimbursement from it.

Medicaid enrollment timelines vary by state.

At a glance: How the three compare

A rough timeline: What happens and when

These steps don’t always happen in a perfectly linear order, and some overlap is to be expected. But this is a reasonable framework for a clinician starting from scratch: 

 
Common mistakes and misconceptions 

New clinicians run into the same friction points. Knowing them in advance can save you months of delays.

Seeing clients before your effective date

Credentialing approval doesn’t automatically mean you can bill. Your payer contract has an effective date, which is the date from which your sessions are covered. Sessions before that date generally won’t be reimbursed. If you want to see a client before your credentialing is complete, treat them as private pay until your status is confirmed.

Missing CAQH re-attestation

CAQH requires you to re-attest your profile information every 120 days (180 days in Illinois). If you miss the deadline, payers lose access to your profile, which can stall claims processing and trigger re-credentialing delays. CAQH sends reminder emails, but it’s worth setting your own calendar reminders too.

Assuming enrollment and credentialing are the same thing

They’re related but separate. Credentialing is the verification process. Enrollment is specific to government programs. You’ll do both if you want to accept Medicare or Medicaid, but you track them in different systems and on different timelines.

Signing a contract without reading it

Reimbursement rates, filing deadlines, and appeal processes vary significantly by payer. A contract you sign is legally binding. Read it fully before returning it, and ask questions if anything is unclear.

Not following up

Applications get stalled, emails go unanswered, and documents get lost. Most payers have a policy on how frequently you can check in on your application status. Follow their guidelines, but do follow up. Silence is not a sign that everything is on track.

Thinking credentialing is a one-time event

It’s not. Most payers require recredentialing every two to three years. You’ll also need to update your CAQH profile any time your license, malpractice coverage, address, or practice information changes.

Managing the administrative side of your practice

Getting credentialed and in-network is the start – not the end – of your relationship with insurance. Once you’re billing, you’ll be submitting claims, tracking reimbursements, managing denials, and keeping your credentials current, all while seeing clients.

TheraNest is built for exactly this. Its billing tools are designed for solo and small-group mental health practices, with automated tools for insurance billing, claim submission, and payment tracking in one place so you’re spending less time chasing reimbursements and more time doing the work you went to school for.

Follow us on LinkedIn for more help on building and running your mental health practice. You should also subscribe to our Practice Success newsletter.