Cash Flow in the First Year: How ABA Practices Avoid the Billing Gap

Most BCBAs launching a practice expect the first year to be hard. They expect the clinical load, the documentation, the staffing. What they don’t expect is the gap — a window of weeks or months where services are running and revenue isn’t arriving.

That gap doesn’t mean something went wrong. It means you didn’t plan for the revenue cycle timeline. This article lays out what that timeline actually looks like and how to build a bridge.

The 90-Day Void

Credentialing is the prerequisite. You can’t bill most insurance payers until you’re paneled with them. For a detailed walkthrough of the full sequence, see how to start an ABA practice. The CAQH ProView enrollment process — the industry standard for provider credentialing — takes an average of 90–120 days per payer, and that’s when things go smoothly.¹ Complex payers, incomplete paperwork, or gaps in your CAQH profile can stretch it further.

Here’s what the typical revenue cycle looks like for a new ABA practice:

Week	Milestone
Week 1–2	Credentialing applications submitted
Week 8–16	First payers approve (wide range)
Week 10–18	Prior authorization requested for first clients
Week 12–20	Prior auth approved; services can begin
Week 14–22	First claims submitted
Week 18–26	First EOBs and payments received

Do the math: in a best-case scenario, you’re looking at 4–5 months between opening your doors and receiving your first check. In practice, most new practices hit the 6-month mark before cash flow normalizes.

That gap is structural. It’s not a billing error or a credentialing failure. It’s the timeline.

Why New Practices Don’t See It Coming

Three things combine to create false confidence:

1. Credentialing feels like progress. Submitting applications is active. It feels like revenue is coming. It’s not. Credentialing approval is a prerequisite, not a revenue event. Approval just means you can start the billing process.

2. Prior auth adds another delay. Once you’re credentialed, you still can’t see clients until prior authorization is approved. For Medicaid clients, that’s another 2–4 weeks. For commercial payers, the timeline varies but is rarely under two weeks. Clinically complex cases can take longer.

3. The claims-to-payment lag is underestimated. Even after claims go out, commercial payers typically remit in 14–30 days. Medicaid varies by state — some remit in 7 days, others take 30–45. If a claim is rejected and needs to be corrected and resubmitted, add another cycle.

New practice owners often plan for cash on hand to cover two months. The actual need is closer to five to six.

Bridge Strategies

Start collecting private pay immediately. While you’re credentialing, you can see clients on a private-pay basis. Set rates that reflect your actual cost structure, not what feels comfortable to charge. Some families prefer this — no auth delays, no payer oversight. Use this revenue to cover operations during the credentialing window.

Request retroactive billing where available. Some payers will allow you to backdate claims to the date your credentialing application was submitted. This is payer-specific and not guaranteed, but it’s worth pursuing. Ask explicitly during your payer contract negotiation. A few payers — particularly some Medicaid plans — make this part of their standard enrollment terms.

Apply for a business line of credit before you need it. Banks underwrite loans on current cash flow. Apply before the gap hits, not during it. An SBA 7(a) loan or a business line of credit secured against equipment or receivables can cover operations while you wait for the billing pipeline to fill.²

Stagger your payer mix intentionally. Commercial payers often credential faster than Medicaid. If you can start seeing commercially insured clients first, you may receive payment faster and use that cash flow to carry the Medicaid pipeline.

Reduce your accounts receivable lag. Clean claims submitted quickly get paid faster. That means verifying benefits and authorizations before every service date, using clearinghouses with real-time claim status, and correcting rejected claims within 24–48 hours of the rejection notice. A clean claim submitted day one is worth more than a corrected claim submitted three weeks later.

The Revenue Cycle Timeline, Realistically

Here’s a closer look at what a well-run new ABA practice should project:

Month 1–2: All credentialing applications active. Operating on private pay or founder capital. Focus: zero incomplete applications, weekly follow-up calls to each payer.

Month 2–4: First payer approvals arriving. Begin prior auth for approved payer clients. Private pay continues for uncredentialed payers. First claims submitting for approved payer clients.

Month 4–5: First payments from commercial payers. Medicaid lag still in progress. Cash flow begins but is not yet stable. Watch accounts receivable aging closely — claims that fall past 45 days need active follow-up.

Month 5–6: Medicaid payments begin arriving. Revenue cycle begins to normalize. This is when you can start modeling forward with reasonable confidence.

Month 7+: Full payer mix operational. Renewal auth cycle begins for early clients. This is the point where most practices realize whether their billing processes are clean enough to sustain.

What Most Practices Get Wrong

They hire staff before revenue arrives and don’t model the cash flow gap. Then they start cutting corners — billing less frequently, delaying resubmissions, letting aged claims sit. Those shortcuts compound the delay.

The billing process isn’t a back-office function. In year one, it’s survival infrastructure. Practices that treat billing as a day-one priority — not a month-three priority — survive the gap. Practices that don’t often don’t make it to year two.³

What a Clean First Year Actually Looks Like

Credentialing applications submitted week one, tracked weekly
CAQH profile complete and verified before any application goes out
Private-pay rate schedule live on day one
Benefits verification completed before first service date for every client
Prior auth submitted as soon as credentialing is approved, not after
Claims submitted within 24 hours of service date
Rejected claims corrected within 48 hours
AR aging report reviewed weekly — for the specific metrics to watch, see our guide to ABA RCM metrics

That’s not ambitious. That’s baseline. If it sounds like a lot to manage while also running clinical operations, it is — and that’s exactly why most successful new ABA practices outsource billing before they open, not after they’ve already fallen behind.

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

Download the ABA Practice Startup Checklist — the step-by-step timeline that tells you exactly what to do and when, from credentialing applications to first payment. Available free at abapracticeservices.com.

Or book a free 30-minute consultation to walk through your specific payer mix, timeline, and cash flow plan with the help of our ABA practice services. Schedule at abapracticeservices.com.

CAQH. (2023). 2023 CAQH Index: Closing the Gap — The Industry’s Progress and Opportunities to Reduce Administrative Burden. CAQH.org. ↩
U.S. Small Business Administration. (2024). SBA Loan Programs. SBA.gov/funding-programs/loans. ↩
Margolis, P., & Bodenheimer, T. (2010). Transforming primary care: from past practice to the practice of the future. Health Affairs, 29(5), 779–784. (Broader practice viability context; revenue cycle management cited as key sustainability factor.) ↩