Switching business banks is one of those tasks that feels complicated but is actually very manageable with a clear plan. For medical practices, the main concern is making sure insurance reimbursements keep flowing — but with the right approach, you can transition smoothly over 2–4 weeks.
Switching business banks is one of those tasks that feels complicated but is actually very manageable with a clear plan. For medical practices, the main concern is making sure insurance reimbursements keep flowing — but with the right approach, you can transition smoothly over 2–4 weeks. This guide walks you through exactly how to do it.
Most practices switch because they're tired of paying per-ACH fees on every insurance reimbursement, because monthly maintenance fees are eating into their margins, or because their bank has no features designed for healthcare billing, the kind of drain covered in the true cost of banking for a medical practice (opens in a new tab). What starts as a vague sense of "our bank costs too much" becomes concrete when someone actually adds up the fees: $480/year in ACH charges, $300/year in monthly fees, $720/year in wires. That is over $1,500/year for basic business banking.
Others are driven to switch by structural growth: expanding to multiple locations, setting up an MSO/PC structure with per-entity virtual accounts (opens in a new tab), or needing better cash management across entities. Whatever the catalyst, the process for switching is the same, and it's simpler than most practice administrators expect.
The cardinal rule of switching banks is to open the new account before closing or moving anything. Your old account stays fully active and funded throughout the entire transition period. This is what protects you — any payment that hits the old account during migration will still be received and accessible. Opening a Lemma account takes about 5 minutes online — no branch visit, no paper forms, no waiting for a banker to call you back. Once your account is open, you'll have your new routing number and account number ready to use for the next steps.
This is the most critical step. Log into each insurance payer portal — Medicare, Medicaid, Blue Cross, Aetna, UnitedHealth, Cigna, and any other active payers — and update your banking information (routing number + account number) to your new account. Most payer portals have a section for "EFT Enrollment" or "Banking Information" in the provider settings area.
Most payers process ACH changes within 1–2 billing cycles, so expect 2–4 weeks before payments begin routing to the new account. Keep your old account active and funded during this window — payments will continue hitting the old account until each payer's update processes.
Pro tip: pull your ERA remittance reports for the last 60–90 days to generate a complete list of active payers. It's easy to forget smaller payers or secondary insurers that send only occasional payments — and missing one means a payment could go uncollected if the old account is closed too early.
In week 2, after confirming that payer routing updates are processing, update your payroll provider (ADP, Gusto, Paychex, or whichever you use) to debit payroll from your new account. Coordinate the change so it takes effect after the current payroll cycle to avoid any mid-cycle disruption.
Also update any recurring vendor ACH debits — malpractice insurance premiums, EHR subscription fees, medical supply auto-pay, cleaning services, and any other vendors set to pull from your business account. A quick review of last month's bank statement will surface all active ACH debits.
If your EHR or clearinghouse (Availity, Change Healthcare, Office Ally, etc.) stores your bank account information for ERA/EOB deposits or remittance data, update those records to point to your new account. This ensures your remittance data flows correctly and that any clearinghouse-level payment routing is aligned with your new medical lockbox (opens in a new tab).
This step is often overlooked but matters for practices using lockbox services or automated EOB processing — the remittance data needs to match the account where deposits land.
Keep both accounts open and funded for at least 30 days after initiating the transition. Check your old account at least weekly — ideally every few days — for any deposits that haven't yet migrated. When you see a payment on the old account, identify which payer sent it and verify whether their portal update has been submitted or still needs to be.
The 30-day window covers most payer billing cycles. Once you've gone two full billing cycles without any deposits hitting the old account, you can safely proceed to close it. Don't rush this step — a single overlooked payer can send a payment to a closed account, which requires a recovery process through your bank.
Before closing, download full transaction history and statements for your records — at minimum the last 12 months, ideally 24. Cancel or confirm that all automatic ACH debits have been redirected away from the old account. Transfer any remaining balance to your new account. Then contact your old bank to formally close the account and request written confirmation of closure.
| Week | Action |
|---|---|
| Week 1 | Open new account. Log into each insurance payer portal and update your ACH routing and account number. |
| Week 2 | Update payroll provider (ADP, Gusto, etc.) and recurring vendor ACH debits. Update your clearinghouse or EHR banking records. |
| Week 3 | Monitor both accounts. Confirm insurance deposits are arriving in new account. Note any payers still hitting the old account. |
| Week 4+ | Confirm full migration across two billing cycles. Close old account when no deposits have hit it for 2+ weeks. |
How long does it take to switch insurance payer ACH? Most payers process ACH enrollment changes within 1–2 billing cycles. Plan for 2–4 weeks from the time you submit the update in each payer portal to when payments begin routing to the new account.
Will I miss any payments during the switch? No — as long as you keep your old account open and funded throughout the transition, any payment that arrives there during migration will still be received. The key is not closing the old account prematurely.
Does Lemma help with the switch? Yes. Lemma's onboarding team can walk you through payer portal updates and answer questions about the migration process, the same fast onboarding covered in our comparison of banks for multi-location medical groups (opens in a new tab).
Can I open Lemma just for insurance reimbursements and keep my old bank for other things? Yes. Some practices start by routing insurance reimbursements to Lemma while keeping their existing bank for payroll and vendor payments. You can migrate other functions later once you're comfortable with the new account.