> ## Documentation Index
> Fetch the complete documentation index at: https://dso.getlemma.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Payment rails 101 (ACH, checks, wires, RTP, cards)

> Practical rail literacy for dental operators: how payer EFTs and takebacks work, why deposits bounce days later, when to wire, and who actually pays the card fee.

A **payment rail** is the network a payment travels on. A dental group uses all of them, and each has different timing, cost, reversibility, and failure modes. Knowing which rail a payment is on tells you when the money is really yours.

## The rails at a glance

| Rail             | Speed                                  | Cost to you               | Reversible?                    | Where you meet it                              |
| ---------------- | -------------------------------------- | ------------------------- | ------------------------------ | ---------------------------------------------- |
| **ACH credit**   | 1–2 business days (same-day available) | Low or free               | Limited, by rule               | Payer EFTs, payroll, vendor payments           |
| **ACH debit**    | 1–2 business days                      | Low                       | Yes, within return windows     | **Payer takebacks**, membership autopay        |
| **Check**        | Days, plus return risk                 | Materials, postage, labor | Yes, returns arrive days later | Small payers, patients, refunds, settlements   |
| **Wire**         | Same day                               | $15–$50                   | **No**, effectively final      | Acquisition closings, large vendor payments    |
| **RTP / FedNow** | Seconds, 24/7                          | Low                       | **No**                         | Growing, not yet standard for payer remittance |
| **Card**         | 1–3 days to settle                     | 2–3%+                     | Yes, chargebacks               | Patient payments, membership plans, payer VCCs |

## ACH, the workhorse

Most dental payer money arrives as an **ACH credit** once EFT enrollment is done: the payer pushes funds to your account. The health care EFT standard is the ACH CCD+ entry, whose **addenda record carries the reassociation trace number** matching the payment to its 835.<sup>1</sup>

That addenda is the reconciliation key. Ask whether your bank includes it in reports because many do not, leaving staff to match payments manually. Check this before choosing a bank. EFT enrollment is generally maintained for the applicable payer or program, enrolled entity or TIN, and sometimes provider or location. Map each relationship instead of assuming one enrollment covers the group. See [Set up EDI, ERA, and EFT](/guides/enrollment/set-up-edi-era-eft).

### ACH debits, payers can pull money out

The direction operators forget. **A payer with an ACH debit authorization can withdraw funds from your account** to recover an overpayment.

This is a legitimate recoupment mechanism and it is contractually permitted in many agreements. But it means:

* Money can **leave** the PC's account without anyone at your practice initiating it
* If unexpected, it looks like fraud until you trace it
* It has to be reconciled against the corresponding PLB entry or demand letter

**Monitor PC accounts for unexpected debits.** In a multi-entity group with eleven accounts and no cross-entity view, a payer recoupment can sit unexplained for weeks. See [Handle recoupments and takebacks](/guides/compliance/handle-recoupments).

The more familiar use of ACH debit is **membership plan autopay**. With the patient's authorization, the practice pulls a monthly membership fee by ACH or charges a card on file. This is a subscription flow, with issues such as retries and expired authorizations, rather than a claims flow. See [Membership and discount plans](/concepts/payments/membership-and-discount-plans).

### Same-day ACH

Available with cutoff times and a per-transaction dollar cap set by Nacha rules. Useful for payroll corrections and time-sensitive payments. Costs more than standard ACH.

## Checks, and why deposits bounce days later

The rail with the worst failure characteristics, and the one dentistry cannot escape.

**A deposited check is not settled funds.** The credit appears, funds may be made available, and days later the item can be returned, reversing the credit and usually charging a fee.

Common return reasons:

| Code / reason         | Meaning                                                              |
| --------------------- | -------------------------------------------------------------------- |
| Insufficient funds    | Balance too low                                                      |
| **Closed account**    | The account no longer exists, common with patients who changed banks |
| Stop payment          | The issuer stopped it                                                |
| Stale dated           | Presented past validity                                              |
| Refer to maker        | Contact the issuer                                                   |
| Endorsement irregular | A problem with your endorsement                                      |
| Duplicate presentment | Deposited twice                                                      |

<Tip>
  **Don't treat check deposits as cleared revenue on the deposit date.** Run a returned-item review as part of daily reconciliation. In a DSO group this compounds: a returned deposit in one PC can flow into a management fee transfer that shouldn't have been made.
</Tip>

**Endorsement and entity matching.** A check payable to a PC must be endorsed by that PC and deposited into an account authorized to receive its funds. Multi-entity groups need a separate endorsement process for each entity. A check payable to the Colorado PC, for example, should not be deposited into the Arizona PC's account. See [Handle paper checks](/guides/banking/deposit-paper-checks).

## Wires, fast and final

**Wires are effectively irreversible.** Once sent, recovery depends on the receiving bank's cooperation and the recipient's willingness.

Use them for: practice acquisition closings and their escrows, real estate, large one-time vendor and equipment payments, and anything where the counterparty requires it. In a group growing by acquisition, closing wires are routine rather than rare.

<Warning>
  **Wire fraud targets healthcare transactions specifically.** An attacker may compromise or spoof an email account and send revised wire instructions before closing. **Verify every new or changed instruction by calling a known contact at a number obtained independently**, not a number in the instruction email.
</Warning>

## RTP and FedNow

**RTP** (The Clearing House) and **FedNow** (Federal Reserve) are instant, irrevocable, 24/7 credit-push rails.

Adoption is growing but they are **not yet standard for payer remittance**, largely because the healthcare EFT standard is built on ACH CCD+ with its addenda structure. Expect ACH to remain the payer rail for the foreseeable future. Where instant rails matter today is patient payments and urgent vendor payments.

Both are **irrevocable**, which is a feature for receiving and a risk for sending.

## Cards, who pays the 3%

Card payments cost the merchant. **Interchange** flows to the card-issuing bank, plus network assessments and your processor's markup, totaling roughly 2–3% or more depending on card type and how the transaction is captured.

Cards are a major part of dental collections because patients often owe amounts above annual plan maximums, along with downgrades and non-covered work. That creates three practical consequences:

**Payer virtual credit cards** turn a low-cost ACH credit into a card transaction that may cost 2–3%. You may be able to request or require EFT instead, subject to the payer arrangement. See [Paper checks and virtual credit cards](/concepts/payments/paper-checks-and-vcc).

**Card-not-present transactions cost more** than card-present transactions. Payments taken by phone or online, including membership charges on stored cards, tend to carry higher rates and greater fraud exposure than in-office payments.

**Surcharging**, passing the fee to the patient, is permitted in some states and restricted in others, and card network rules impose their own requirements including disclosure and caps. Verify both before implementing. See [Set up card payments](/guides/payments/set-up-card-processing).

## Which rail for which flow

| Flow                     | Rail                                  | Why                                                                   |
| ------------------------ | ------------------------------------- | --------------------------------------------------------------------- |
| Payer remittance         | **ACH credit (EFT)**                  | Free, carries the TRN addenda, standard                               |
| Payer recoupment         | ACH debit or PLB offset               | Contractual; monitor for it                                           |
| Patient payment at visit | Card present                          | Convenient; lower rate than CNP                                       |
| Patient payment remote   | Card not present, or ACH              | Card for convenience; ACH for large balances                          |
| Membership plan billing  | Stored card or ACH debit, authorized  | Subscription mechanics; watch retries and churn                       |
| Patient refund           | Original method, else check           | See [Issue a patient refund](/guides/payments/issue-a-patient-refund) |
| Clinical payroll         | ACH from the **PC** account           | The PC employs the dentists and hygienists                            |
| Non-clinical payroll     | ACH from the **DSO** account          | The DSO employs everyone else                                         |
| Management fee           | ACH from PC to DSO, **on an invoice** | Never an automated sweep                                              |
| Vendor and lab payments  | ACH; wire when required               |                                                                       |
| Acquisition closing      | Wire, verified by phone               |                                                                       |

## Reconciliation implications

Every rail reconciles differently, and a three-way reconciliation has to handle all of them:

* **ACH credits**, match to the 835 by TRN
* **Card settlements**, arrive **net of fees**, in batches that don't align to individual payments. Record gross revenue and fee expense separately, or you understate both.
* **Membership autopay**, batches by billing date, not by visit; reconcile against the plan roster, not the schedule
* **Checks**, match manually; watch for returns for at least a week
* **VCCs**, arrive as card transactions but represent payer remittances; must still tie to an 835
* **Wires**, usually one-off, easy to match

See [Reconcile payments daily](/guides/payments/reconcile-daily-payments).

## Sources

1. HIPAA administrative simplification adopted the ACH CCD+ entry with addenda as the health care EFT standard. CMS, [Administrative Simplification: Transactions](https://www.cms.gov/medicare/regulations-guidance/administrative-simplification/transactions). ACH rules are maintained by [Nacha](https://www.nacha.org/).