Network status is one of the most misunderstood parts of TRICARE coverage. Many people assume that if a facility accepts TRICARE, the cost-sharing will be the same regardless of where they go. It is not. Whether a facility has a contract with TriWest , the TRICARE regional contractor for San Antonio , determines both what you pay and whether the facility can bill you for charges above TRICARE’s allowable rate.

The most important thing to do before entering any facility

Call TriWest at 1-888-874-9378 and ask them to confirm whether the specific facility is in-network with TriWest by name and NPI number. Do not rely on the facility’s word alone. Network contracts change, and a facility may be TRICARE-certified but out-of-network. Doing this one call before admission prevents the most common source of unexpected treatment bills for TRICARE beneficiaries.

What in-network and out-of-network actually mean

To accept TRICARE at all, a facility must hold a TRICARE certification from the Department of Defense. This is a separate credential from being in-network. Every TRICARE-covered facility is certified , but not every certified facility has a network contract with TriWest.

In-network means the facility has signed a contract with TriWest agreeing to accept TRICARE’s allowable charge as payment in full. The facility cannot bill you for the difference between their actual charge and TRICARE’s allowable rate. You pay your plan’s cost-sharing , a co-pay or percentage of the allowable charge , and the facility accepts that as payment complete.

Out-of-network means the facility is TRICARE-certified but has no rate contract with TriWest. TRICARE still pays , but it pays a lower percentage of a lower base rate. And the facility is not prohibited from billing you for the difference between what TRICARE pays and what they actually charge. This is called balance billing, and it is legal for out-of-network providers.

Recommended

In-network facility

Has a contract with TriWest. Agrees to accept TRICARE’s allowable charge. Cannot balance bill you. You pay your plan’s standard cost-sharing percentage, subject to the annual out-of-pocket cap.

TRICARE Select inpatient cost-sharingUp to 25%
Balance billing riskNone , prohibited
Annual cap applies?Yes , $3,500
Prior auth required?Yes, for inpatient
Higher cost , use cautiously

Out-of-network facility

TRICARE-certified but no rate contract. TRICARE pays a portion of a lower base rate. The facility can bill you for the remaining balance. Balance billing is not subject to your annual cap.

TRICARE Select inpatient cost-sharing50% of allowable
Balance billing riskHigh , facility can bill remainder
Annual cap applies?Only TRICARE’s portion
Prior auth required?Yes, for inpatient

The balance billing problem explained

Balance billing is the single largest source of unexpected treatment costs for TRICARE beneficiaries who choose out-of-network facilities. Here is a concrete example of how it works.

Suppose an out-of-network residential facility charges $900 per day. TRICARE’s allowable charge for that level of care and market is $500 per day. TRICARE Select pays 50 percent of the allowable charge, so TRICARE pays $250 per day. The remaining $650 per day is your potential responsibility , $250 from your cost-sharing portion of the allowable charge, plus $400 in balance billing from the facility’s charge above the allowable rate. For a 28-day residential stay, that could be $18,200 in balance billing alone, on top of your TRICARE cost-sharing.

The annual out-of-pocket cap does not cover balance billing. The $3,500 catastrophic cap for TRICARE Select applies only to your cost-sharing on TRICARE’s allowable charge. The balance billed amount above the allowable charge sits outside the cap entirely.

This is not a hypothetical , it is one of the most common financial complaints from military families who chose a facility without verifying network status first.

TRICARE Prime: even stricter about network

For TRICARE Prime beneficiaries (active-duty and their families enrolled in Prime), going out of network without a referral authorization triggers the point-of-service option , a separate set of cost-sharing rules that are significantly worse than the standard in-network rates.

Under the point-of-service option, you pay 50 percent of TRICARE’s allowable charge with a separate $300 individual deductible that does not apply to your regular Prime deductible (which is $0). There is no annual cap on point-of-service cost-sharing. In addition, the facility can still balance bill you for amounts above the allowable charge.

For TRICARE Prime beneficiaries, the practical rule is simple: always get a referral from your PCM before seeking civilian care, and verify that the referred facility is in-network before admission. Your PCM referral should direct you to an in-network facility, but it is still worth verifying independently.

How to verify network status before admission

1

Get the facility’s name and NPI number

The facility’s NPI (National Provider Identifier) is a unique 10-digit number. Ask the facility’s billing department for it directly. You will need this to get an accurate network status confirmation from TriWest.

2

Call TriWest and ask specifically about network status

TriWest: 1-888-874-9378. Ask: “Is this facility in-network with TriWest for substance use treatment under my plan?” Provide the facility name and NPI. Ask them to confirm whether the facility can balance bill you. Get the representative’s name and note the date and time of the call.

3

Check the TRICARE provider directory as a second check

Search the TRICARE provider finder at tricare.mil/FindDoctor. Filter for substance use treatment providers in San Antonio. Network status shown here reflects the database at the time of your search. Always confirm by phone as well , the directory may lag behind actual contract changes.

4

Ask the facility directly in writing

Ask the facility’s admissions team to confirm in writing (email is fine) that they are in-network with TriWest and that they will not balance bill you for amounts above TRICARE’s allowable charge. An in-network facility will have no problem confirming this. Hesitation or vague language is a warning sign.

When out-of-network may be the only option

In some cases, the specific level of care or specialized program you need may not be available at an in-network facility in San Antonio. In those situations, going out of network may be clinically necessary.

If you believe an out-of-network facility is the only appropriate clinical option, contact TriWest before admission and explain the clinical situation. In some cases, TriWest can issue a single-case agreement , a temporary in-network arrangement between TRICARE and an out-of-network facility for a specific episode of care. Single-case agreements are not guaranteed, but they are worth requesting when the clinical justification is clear and there is no in-network equivalent available.

If a single-case agreement is not possible and you proceed with an out-of-network facility, negotiate directly with the facility on balance billing. Some facilities will agree to waive balance billing for TRICARE beneficiaries in exchange for prompt payment, particularly if you or your advocate can explain TRICARE’s payment process clearly.

What this means for San Antonio specifically

San Antonio falls under the TRICARE West region, managed by TriWest Healthcare Alliance. The network of substance use treatment providers under TriWest in the San Antonio area includes multiple facilities across levels of care , residential, PHP, and IOP. The military treatment facilities at Fort Sam Houston and Lackland AFB are always in-network (they are part of the Military Health System).

Our treatment centers directory lists facilities in the San Antonio area that work with TRICARE beneficiaries. Network status is noted for each facility as reported to us, but always verify directly with TriWest before admission. Network contracts change and directories can lag behind current status.

Common questions

If a facility says they take TRICARE, does that mean they are in-network?
Not necessarily. A facility that says they accept TRICARE may be TRICARE-certified but out-of-network with TriWest. They can still bill TRICARE and receive partial payment , but at the lower out-of-network rate, and they can balance bill you for the remainder. Always ask specifically whether they are in-network with TriWest, not just whether they accept TRICARE. These are different questions with different answers.
Can I appeal a balance billing charge?
Balance billing from an out-of-network provider is generally not appealable through TRICARE because TRICARE has no contract with that provider to enforce. Your recourse is to negotiate directly with the facility, ask whether they will accept TRICARE’s payment as full payment, or consult with a patient advocate or billing specialist. If you believe the facility misrepresented their network status, document everything and contact TRICARE’s beneficiary support line. For denied claims , as opposed to balance bills , TRICARE’s appeal process does apply. See our guide on how to appeal a TRICARE denial.
Does network status matter for medication-assisted treatment (MAT)?
Yes. For opioid treatment programs (OTPs) that dispense methadone for MAT, the same in-network vs out-of-network rules apply for cost-sharing purposes. For buprenorphine prescribed in an outpatient clinical setting, the prescribing provider’s network status affects your cost-sharing. For most outpatient prescriptions, standard TRICARE pharmacy benefits apply regardless of whether the prescriber is in-network. Call TriWest or the TRICARE Pharmacy at 1-877-363-1303 to confirm for your specific situation.
I already went to an out-of-network facility and received a large balance bill. What can I do?
First, verify that TRICARE processed the claim correctly by checking your Explanation of Benefits at tricare.mil or calling TriWest. If the TRICARE portion was paid correctly and the balance bill is for amounts above the allowable charge, negotiate directly with the facility. Ask for an itemized bill and request a reduction or write-off of the balance. Many facilities will negotiate, particularly for beneficiaries experiencing financial hardship. A hospital patient advocate or medical billing advocate can assist with this negotiation at no cost in some cases.
Medically reviewed
Dr. Matthew Parker, MD
MD, Family Medicine and Functional Medicine · Founder, Heritage Medicine
About our reviewer →
Network status and cost figures reflect 2025 information. Always verify current network status with TriWest at 1-888-874-9378 before admission. This is not financial, legal, or medical advice.

Verify a facility before you commit

Call TriWest at 1-888-874-9378 with the facility name and NPI. One call before admission is all it takes. Veterans Crisis Line: 988, press 1.

988, press 1 , Veterans Crisis Line