What Is a Medical Billing Clearinghouse? When a NEMT Company Needs One

What a clearinghouse is

HIPAA defines a health care clearinghouse as a public or private entity that turns health information from a nonstandard format into a standard transaction, or turns a standard transaction back into a nonstandard format for the entity receiving it (45 CFR 160.103). The definition names billing services, repricing companies, and “value-added” networks and switches as examples. In plain terms, it sits between you and the payers and speaks their file format for you.

A clearinghouse is a HIPAA covered entity in its own right. When it processes claims for a provider that is also a covered entity, it is that provider’s business associate. CMS gives this exact case as an example: a clearinghouse that translates a provider’s claim into a standard transaction and forwards it to a payer (Are You a Covered Entity?, page last modified March 16, 2026). In that role, HIPAA bars it from using or disclosing rider information except as your contract allows (45 CFR 164.500).

Using one does not keep you outside HIPAA. CMS’s Covered Entity Decision Tool says that a provider that uses another entity, such as a clearinghouse, to send covered transactions electronically is treated as sending them itself. See HIPAA for NEMT providers for how that test applies to ride companies.

What a clearinghouse does with a NEMT claim

1. You send the trip data. Your billing system exports claims, or you key them into the clearinghouse’s portal.
2. It checks and converts them. It edits for missing fields, builds a standard 837P file, and routes each claim to the right payer.
3. The payer answers the file. A 999 acknowledgment reports whether each batch in the file was accepted or rejected. New York says it is generally available within 2 hours (Trading Partner Information Companion Guide, version 3.1.2, July 7, 2026).
4. The payer answers each claim. A 277CA reports each claim as accepted or rejected, generally within 4 hours in New York. A rejected claim never enters processing, so it has to be fixed and sent again.
5. The payment file comes back. After the payer decides the claim, the electronic remittance, the 835, can flow back through the clearinghouse to your billing system, with a reason code on every unpaid dollar.

Some reports go only to the clearinghouse. Indiana sends a 277U notice once a day, Monday through Friday, listing claims denied for bad billing provider details, such as an invalid NPI. Its EDI module (version 8.0, March 20, 2025) says the clearinghouse must forward the denials to you, because they never appear on your remittance or 835.

Does a NEMT company need one?

It depends on who pays your trips and how each payer takes claims.

How you get paid	Do you need a clearinghouse?	Why
Broker trips	Often no	Ask each broker how it takes claims. MTM Health pays properly submitted invoices within 30 days after online electronic submission (standard agreement, January 1, 2023 version posted by Pennsylvania). Its Rhode Island handbook (last updated July 1, 2026) has you submit claims in MTM Link, its own platform.
State Medicaid fee-for-service trips	Optional	Indiana lets you send claims through its Provider Healthcare Portal without becoming a trading partner.
Several Medicaid health plans	Helpful	One connection reaches many payers. A health plan must accept a standard transaction if you ask to send one (45 CFR 162.925).
A payer that requires one	Required	The plan itself may not charge you more than normal telecommunication costs for it (45 CFR 162.925(a)(5)). A clearinghouse you hire sets its own fees.

For every route to send claims, including state portals and direct files, see how to submit NEMT claims electronically. For how brokers take claims, see how to bill NEMT brokers.

The agreements a clearinghouse needs

With you: a business associate agreement

Sign a business associate agreement before any trip data moves. Under 45 CFR 164.504(e), it must, among other things:

• Limit what the clearinghouse may do with rider information to what the contract allows
• Require safeguards for electronic records under the Security Rule
• Require it to report any use or disclosure the contract does not allow, including breaches
• Bind its own subcontractors to the same limits
• Require it to return or destroy the data when the contract ends, if feasible
• Let you end the contract if it breaks a material term

Two HIPAA transaction rules belong in the contract too. You must require the clearinghouse, and any agent or subcontractor it uses, to follow the transaction standards (45 CFR 162.923). You must also require it to use your NPI, and other NPIs, correctly in every transaction it sends for you (45 CFR 162.410).

With each payer: enrollment and a link to you

Medicaid programs enroll or approve the clearinghouse before they take its files, and some tie it to your provider ID. Here is what four of them require.

Payer	What the clearinghouse needs
New York Medicaid	The clearinghouse must be enrolled in NYS Medicaid and hold a service bureau ETIN (Electronic Transmitter Identification Number). A notarized Certification Statement is needed for each provider ID and ETIN pair, renewed every year, plus a trading partner agreement. A default ETIN decides where certain electronic remittances go.
Indiana Medicaid	Use a clearinghouse or billing service approved by the IHCP. You then do not need to become a trading partner yourself.
Medi-Cal	The submitter registers in the Medi-Cal Provider Portal and must be affiliated with you.
Texas Medicaid (TMHP)	Every EDI submitter must file a new EDI Trading Partner Agreement by May 15, 2027. The form opens December 1, 2026, and accounts without it will be deactivated. On December 1, 2026, TMHP also deactivates submitters that have not used their account since November 30, 2025.

Ask each Medicaid health plan for its companion guide and payer ID, and give both to the clearinghouse. For the payer’s side of the agreement, see trading partner agreement. For how the state’s claims system fits in, see MMIS.

If it also receives your money

Some billing services also collect your payments. Federal rule 42 CFR 447.10 lets a state Medicaid program pay a business agent, such as a billing service, in your name only if its pay is tied to the cost of billing, is not a percentage of what is billed or collected, and does not depend on collection. See NEMT billing services for how that shapes pricing.

What stays your job

Handing claims to a clearinghouse does not hand off the responsibility. Medi-Cal’s claim submission manual says providers “are responsible for all claims submitted with their provider number regardless of who completed the claim.”

• Keep your own access. Ask for your own login to each payer portal so you can check claim status yourself.
• Read every rejection. Ask for the 999, 277CA, and any state notice such as Indiana’s 277U, not just paid totals.
• Watch the filing clock. A claim stuck in a rejection queue still runs against its timely filing limit.
• Know what you pay for. Get the fee terms in writing, including any charge per claim or per payer.
• Plan your exit. Make sure the contract says how your claim history comes back to you when it ends.

One change is on the calendar. On and after May 26, 2028, federal HIPAA standards apply to electronic claim attachments, including the X12 275 for sending documents that support a claim (45 CFR 162.2002). Ask your clearinghouse whether it will carry attachments, such as trip logs, when your payers start asking for them that way.