What Is a Trading Partner Agreement? The Sign-Up Before You Send Electronic Claims

What a trading partner agreement is

HIPAA defines a trading partner agreement as an agreement about exchanging information in electronic transactions, whether it stands alone or sits inside a larger agreement (45 CFR 160.103). In practice, it is the paper that turns on a direct electronic connection between you and a payer. It says which files you will trade, how you will connect, which IDs you will use, and what each side owes the other.

Some payers make it a separate form. Indiana, New York, and Texas each have their own. Others fold it into enrollment. South Carolina asks every provider to accept its trading partner agreement, along with the participation agreement and the direct deposit agreement, when signing the online enrollment application (Provider Administrative and Billing Manual, July 1, 2026).

It is one of three agreements that are easy to mix up:

Agreement	Who signs it	What it does
Medicaid provider agreement	You and the state Medicaid agency	Makes you an enrolled provider who may bill for rides
Trading partner agreement	You, or your clearinghouse, and the payer	Lets you send and receive claim files electronically
Business associate agreement	You and a vendor that handles rider data	Limits what a clearinghouse or billing service may do with it

What it can and cannot change

A trading partner agreement cannot rewrite the claim standard. Federal rules bar it from changing what a data element means, adding data elements, using codes the standard marks “not used”, or changing the intent of the implementation guide (45 CFR 162.915). The payer’s companion guide can tell you how to fill in the 837P, but it has to stay inside the standard. A health plan also must accept a standard transaction if you ask to send one, and may not delay or reject it because it is standard (45 CFR 162.925).

What the agreement usually covers

Indiana’s agreement for its Medicaid and CHIP programs (revision date February 2025) and Medicare’s EDI Enrollment terms (Claims Processing Manual, chapter 24, Rev. 13105, April 10, 2025) show what to expect. Read these clauses before you sign.

Clause	What to look for	Example
Term and ending	How long it lasts and how either side can end it	Indiana: four years, renewable in four-year terms, and either side may end it with 30 days’ written notice. A material breach not fixed within 30 days of notice lets the state end it at once.
Transactions	The file types you check on the form, such as 837P claims, 835 remittances, 270 and 271 eligibility checks, and 276 and 277 claim status	Indiana: one agreement covers every type you start with. Its EDI module asks for a new agreement to add types later, while the agreement itself allows 30 days’ written notice, so ask the EDI help desk which it wants.
Data quality	Your promise about what you send	Medicare: claims must be accurate, complete, and truthful, and each electronic entry must trace back to a source document showing the rider’s name and Medicare number, dates of service, diagnosis, and service
Security and privacy	Safeguards for rider data, and whether they bind your subcontractors	Indiana: subcontractors must protect the data with the same care, and the duty continues after the agreement ends
Breach notice	How fast you report an improper disclosure	Indiana: notice to the fiscal agent within two business days of discovery, and you indemnify the state for a breach in your care
Costs and failed files	Who pays for the connection and who bears failed transmissions	Indiana: the exchange is at your expense, you bear the risk of failed or garbled files, and a file is not accepted until you get the acknowledgment its companion guide names
Contacts and changes	Deadlines to report new contacts, vendors, or providers	Indiana: a new primary contact within 15 days, and a clearinghouse reports added or dropped providers within 30 days
Signature	What your ID means	Medicare: the submitter ID or NPI is your legal electronic signature and your assurance that services were performed as billed

Medicare’s terms also require you to keep the source records for each electronic claim for at least 6 years and 3 months after the bill is paid. It can also cut off a submitter at once, without appeal, when it finds misuse of an ID or password or suspects fraud. Those Medicare terms bind companies that bill Medicare, and they show the kind of promises any payer can ask for.

When a clearinghouse signs for you

Whether your clearinghouse or billing service can sign in your place depends on the payer. Four examples:

Payer	Who signs
Indiana Medicaid	An approved clearinghouse or billing service signs the agreement and lists the providers it represents, so you do not become a trading partner. If you use approved software to send files yourself, you sign it, and the state then issues your trading partner ID and login (EDI module, version 8.0, March 20, 2025).
New York Medicaid	Every trading partner needs an agreement on file, signed only after Medicaid enrollment and once an ETIN is issued. A billing company gets its own service bureau ETIN, and a notarized Certification Statement is needed for each pairing of a provider ID and an ETIN, renewed every year (companion guide version 3.1.2, July 7, 2026).
South Carolina Medicaid	If a billing agent will read your electronic remittances, you and the agent each need an agreement on file. Yours names the agent, and the agent’s names you and your Medicaid number (manual dated July 1, 2026).
Medicare	Every provider signs its own EDI Enrollment form, even when a clearinghouse sends the claims. The clearinghouse gets its own EDI number and password, and you must tell the Medicare contractor in writing before you switch billing agents or clearinghouses.

Two limits catch owners out. Indiana’s trading partner process covers only the state’s fiscal agent, not its Medicaid health plans, so each health plan that takes your files has its own setup. Broker trips are separate too. A broker may take claims in its own online system instead, so ask each broker how it wants claims before you pay anyone to reach it (see how to bill NEMT brokers).

How to set one up, step by step

Texas Medicaid is a clear example of the full process, from its EDI Get Started checklist (last updated January 29, 2026). It applies if you send files from your own billing system rather than using TexMedConnect, TMHP’s web tool, or one of its approved vendors.

1. Finish Medicaid enrollment first. Payers link the agreement to an enrolled provider. New York will not take the agreement until you are enrolled and hold an ETIN.
2. Download the forms. Texas requires the Trading Partner Application and Enrollment Form and the Electronic Data Interchange Trading Partner Agreement from every trading partner.
3. Send them in. Mail both to Texas Medicaid & Healthcare Partnership, Attention: EDI, PO Box 204270, Mail stop EDI-B14, Austin, TX 78720-4270. Allow up to 30 days for processing.
4. Test with your submitter ID. TMHP assigns a submitter ID that works only in its test system at first. You must send five error-free batches of 50 transactions for each transaction type you plan to use.
5. Go live. Give the EDI Help Desk (888-863-3638) the batch IDs of your passing tests. Once it moves your submitter ID to production, you can send claims within 24 hours of the confirmation.
6. Keep the account active. On December 1, 2026, TMHP deactivates every EDI submitter that has not used its account since November 30, 2025.
7. File the new agreement. TMHP is replacing its agreement to tighten account security. The new form opens December 1, 2026, is filed online, and must be on file by May 15, 2027, or the account is deactivated (TMHP notice, September 23, 2026).

Other states test differently. Indiana tests software rather than each provider, so if you use software it has already approved, you go straight to the profile and agreement. New software needs no outside HIPAA certification, but it must pass Indiana’s compliance and specification testing, and a transaction passes when it processes without errors and produces a 999 acknowledgment. See how to submit NEMT claims electronically for every route and each state’s testing, and the Texas guide for how Texas pays rides.

What to watch after you sign

• Guard your login. Medicare treats your EDI number and password as your electronic signature and holds you liable if someone you shared them with misuses them. Share them only with staff who need them for claims, and never with a billing service or clearinghouse, which must get its own.
• Report changes on time. Tell the payer before you change clearinghouses or software. Indiana uses its Trading Partner Profile for software and contact changes.
• Read every acknowledgment. Indiana’s agreement says a file is not accepted until you receive the acknowledgment its companion guide names, such as the 999. A rejected claim never entered processing, so fix it and send it again. See claim rejection vs denial.
• Watch the filing clock. Days spent fixing rejected files still count against your timely filing limit.
• Plan for a sale. A buyer sets up its own connection. Medicare bars handing your EDI number and password to a new owner. See how to sell a NEMT business.