Clearinghouses in medical billing: what they do for transportation claims
HIPAA defines a medical billing clearinghouse by its job: turning nonstandard billing data into standard electronic transactions, or back again. For a transportation company, that means building 837P claims from trip data, catching format errors, routing each claim to its payer, and relaying 999 and 835 responses. A company that bills only through state or broker portals may not need one.
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What a clearinghouse does
A clearinghouse sits between your billing system and the payers. HIPAA defines it by function in 45 CFR 160.103: an entity that turns health information from a nonstandard format into a standard transaction, or turns a standard transaction back into the format a receiver needs. Billing services, repricing companies, and value-added networks can all fall under that definition.
For a transportation company, the work breaks into four jobs:
- Formatting. Your trip data becomes an 837P professional claim, the electronic version of the CMS-1500.
- Checking. A standard transaction needs every required field present and valid, so missing member IDs, bad codes, and format errors can be caught here before a payer sees them.
- Routing. The clearinghouse holds the payer connections. You send everything to it, and it delivers each claim to the payer it belongs to.
- Returning responses. Acknowledgments and remittance advice come back through the same channel.
The acknowledgments you get back
Payers answer an electronic claim file in stages. Indiana Medicaid’s EDI module is a clear example:
| Response | What it tells you |
|---|---|
| TA1 | The file’s envelope has errors. It is sent only when something is wrong. |
| 999 | The batch arrived, and whether each group or transaction was accepted or rejected. |
| 277U | Claims denied because the billing provider number or its NPI crosswalk did not check out. Sent to the trading partner once a day. |
| 835 | The payment decision on each claim, with its adjustment codes. |
Indiana adds that 277U denials never reach the provider’s remittance advice or 835, and it makes the clearinghouse or billing service responsible for forwarding them. If yours does not, you may never see those denials, and the filing limit keeps running.
When a transportation company should use one
The payers you bill decide it. Some NEMT payers take claims in their own systems.
- Brokers can run their own portal. In Rhode Island, MTM Health takes claims, trip logs, and member signatures through its MTM Link portal, one at a time or in bulk from its spreadsheet template. Louisiana requires its broker to accept electronic claims and bars it from requiring paper.
- State programs offer direct options. Indiana’s Medicaid program accepts individual fee-for-service claims keyed into its IHCP Provider Healthcare Portal. In Texas, the handbook for the Medical Transportation Program names two electronic routes into TMHP: its own TexMedConnect application or a third-party vendor.
- Direct connections take work. Indiana requires trading partners that connect directly to use approved software or pass its testing. Providers who bill only through the state portal, or only through an Indiana-approved clearinghouse or billing service, never have to become trading partners.
A clearinghouse starts to pay off when you bill several health plans, Medicare Advantage plans, or state programs electronically and want one place to send and track everything. Paper is getting more expensive too: since January 29, 2026, Indiana deducts a $5 fee for each initial fee-for-service claim sent on paper.
The HIPAA side
A NEMT company that bills a health plan electronically may be a covered entity under HIPAA, and covered entities must send those transactions in the standard format, directly or through someone else. 45 CFR 162.923 lets you use a clearinghouse as your business associate for that work, provided you hold it to the same transaction rules. A clearinghouse acting for you may use rider information only as its contract permits.
That contract is the business associate agreement required by 45 CFR 164.504. Read it before you sign, and keep a copy with your HIPAA records. Our guide to HIPAA for NEMT companies covers the rest of the privacy rules, and clean claims explains what a payer needs to decide a claim on the first pass.
Frequently asked questions
- Does HIPAA require a signed contract with my clearinghouse?
- Yes. Handling rider information for you makes the clearinghouse your business associate, and 45 CFR 164.504 spells out what the written agreement must cover. It sets the permitted uses of the data, demands safeguards, obliges the clearinghouse to report misuse and breaches, extends the same terms to its subcontractors, and requires the data to be returned or destroyed, where feasible, once the relationship is over.
- Can I bill Medicaid electronically without a clearinghouse?
- Often, yes. Some state Medicaid programs run a web portal where you key claims one at a time, which HIPAA calls direct data entry. Texas takes Medical Transportation Program claims through its free TexMedConnect application. You can also connect straight to a payer as a trading partner. Indiana requires approved software, or software that passes its testing, for that route.
- Is a billing service the same as a clearinghouse?
- Not always, but HIPAA's definition of a clearinghouse names billing services as one kind. What counts is the function: translating raw billing data into a HIPAA transaction, or translating one back out. A billing service that only types your claims into a payer portal is doing something different from one that builds and sends 837 files.
- What should I do with a claim rejected on the 999?
- Correct it and send it again. A transaction rejected on the 999 was never accepted for processing, so there is no payment decision to appeal and nothing will show on your remittance. Resend it well inside the payer's filing limit, and ask your clearinghouse how it reports these rejections to you.
