How to Start an ABA Practice: The Complete Credentialing Roadmap

You passed the BCBA exam. You’ve got clinical hours. Now you want to build something of your own.

The clinical part? You’re ready. The business side is where most BCBAs hit a wall — and credentialing is usually the first wall they hit.

This article walks you through the full credentialing sequence: what it is, what order to do it in, and how long it actually takes. No filler.

Why Credentialing Determines Everything

You cannot bill insurance without it. Simple.

Credentialing is the process by which insurance payers verify your identity, licensure, training, and liability coverage — and then formally approve you to bill under their network. Until that approval comes through, every session you provide is either self-pay or a revenue leak.

For ABA practices, this matters even more than in general therapy. Most ABA clients rely on insurance, often Medicaid or commercial autism benefit riders. Your revenue stream doesn’t open until credentialing closes. The timeline matters.

Step 1: Get Your NPI Numbers

Before anything else, register for your National Provider Identifier (NPI). You need two:

Type 1 NPI — This is yours as an individual provider. You already have this if you’ve ever billed insurance as a BCBA.

Type 2 NPI — This is your practice’s NPI. It belongs to the business entity (your LLC, PLLC, or PC). You need a separate Type 2 for every distinct legal entity that will bill.

Register through NPPES (nppes.cms.hhs.gov). Type 2 registration requires your EIN, business address, and entity type. Allow 1–2 business days for NPI assignment.

Keep both NPI numbers somewhere you won’t lose them. They’ll be on every credentialing application you submit for the life of your practice.

Step 2: Set Up CAQH ProView

CAQH ProView is the universal provider data repository used by most commercial payers. Aetna, Cigna, UnitedHealthcare, Humana, Anthem, and dozens of regional plans pull your credentialing data directly from CAQH instead of asking you to fill out their own forms.

Create your CAQH account at proview.caqh.org. You’ll upload:

Professional license(s) and BCBA certification
DEA certificate (if applicable — usually not for ABA, but some payers still ask)
Malpractice/professional liability insurance certificate
Work history (10 years minimum for most payers)
Education and training documentation
Hospital affiliations (none is fine — just document it)

Complete your CAQH profile to 100% and authorize the payers you’re applying with to access it. An incomplete CAQH profile is one of the most common reasons credentialing applications stall.

CAQH also requires re-attestation every 120 days. Set a calendar reminder. Missing re-attestation can trigger de-credentialing, even mid-contract.

Step 3: Get Your CLIA Waiver (If Needed)

Most ABA practices don’t need a CLIA waiver, but if your intake process involves any point-of-care lab testing, you’ll want to confirm this early. For pure ABA billing, skip it.

Step 4: Apply to Payers

This is where timelines diverge sharply. Each payer has its own application, its own documentation requirements, and its own internal review process.

The general sequence:

Identify which payers cover the most members in your service area. Your state’s insurance commissioner website or a commercial market share database can help.
Submit applications in order of priority — highest-volume payers first.
Track application dates, confirmation numbers, and follow-up calls in a spreadsheet.

Typical timelines by payer type:

Payer Type	Average Credentialing Timeline
Medicaid (state)	60–180 days
Large commercial (BCBS, UHC, Aetna)	60–120 days
Regional commercial	45–90 days
Medicaid MCOs	90–150 days

These are averages. CMS data shows that provider enrollment processing times for Medicaid can exceed 90 days in states with high application volume. ¹

Plan around the longest possible timeline, not the shortest. Most new practices underestimate this by 60–90 days.

Step 5: Medicaid Enrollment

Commercial payers and Medicaid enrollment are parallel processes, but Medicaid often takes longer and has more state-specific requirements.

For Medicaid, you’ll apply directly through your state’s Medicaid Management Information System (MMIS) or provider enrollment portal. You’ll need:

Type 1 and Type 2 NPIs
W-9 and EIN documentation
Practice location information
BCBA certification and licensure
Background check authorization in some states

Many states also require in-person or virtual site visits before approving ABA providers. Build this into your timeline.

Step 6: Operating While Pending

The credentialing gap — the period between application submission and approval — is a real cash-flow risk. Options while you wait:

Locum credentialing: In some cases, you can bill under a credentialed supervisor or existing group practice while your own credentialing processes. Verify this is permissible with each payer before relying on it.
Self-pay intake: Offer a self-pay rate for new clients while credentialing is pending. Disclose the situation clearly.
Gap billing: A small number of payers allow retroactive claims back to the application date once credentialing is approved. Ask each payer directly. Not all do.

Common Mistakes That Add Months to Your Timeline

Submitting applications before CAQH is complete. Payers can’t process what CAQH can’t provide.
Mismatched information. Your name, NPI, and EIN must match exactly across CAQH, your state license, and the payer application. A single character mismatch generates a deficiency letter.
Missing follow-up. Payers lose applications. They request missing documents without telling you. Call every 30 days to confirm status.
Wrong billing address. Checks and EOBs go to the billing address on file. If it’s wrong, you won’t know claims paid.

The Timeline You Should Actually Plan For

Budget 6 months from “I want to open a practice” to “I can bill insurance.” For Medicaid-heavy practices in high-volume states, budget 9–12 months.

Start the credentialing process before you see your first client. Not after.

The BACB reports over 50,000 certified behavior analysts in the U.S. as of 2023, and the number of independent ABA practices is growing steadily. ² The payer side hasn’t scaled to match. Application queues are real.

You Don’t Have to Do This Alone

Credentialing is process-heavy, deadline-sensitive, and genuinely tedious. Missing a step doesn’t just slow you down — it can delay your revenue by months.

ABA Practice Services handles the full credentialing sequence: CAQH setup, NPI registration, payer applications, Medicaid enrollment, and follow-up. We know which payers are slow, which lose applications, and how to keep things moving. Learn more about our credentialing services.

(Lead magnet CTA: ABA Practice Startup Checklist — free PDF)

Download our free ABA Practice Startup Checklist to track every step from entity formation through first claim submission. Then book a free 30-minute consultation at abapracticeservices.com to talk through your specific situation.

References

Centers for Medicare & Medicaid Services. Medicaid Provider Enrollment. CMS.gov. Accessed 2024. https://www.cms.gov/Medicare/Provider-Enrollment-and-Certification/MedicareProviderSupEnroll ↩
Behavior Analyst Certification Board. BCBA/BCaBA Data: Number of Certificants. BACB.com. Published 2023. https://www.bacb.com/bcba-bcaba-certificant-data/ ↩