TRICARE West Region Billing & Coverage Reference

TRICARE West Region Payer ID

Use this ID in loop 2010BB of the 837 when submitting TRICARE West Region claims electronically.

• •Electronic payer ID: 99726
• •Network: Stedi
• •Payer IDs are assigned per clearinghouse. Confirm this ID against your own clearinghouse's payer list before submitting - a wrong ID is rejected at the clearinghouse, not adjudicated.

Source: Stedi payer network directory. Verify with TRICARE West Region before relying on this for a claim.

TRICARE West Region Timely Filing Limit

TRICARE West Region claims must be submitted within the deadline below. Claims received after the limit are denied as untimely, and an untimely denial is rarely overturned without proof of earlier submission.

• •TRICARE (all beneficiary/provider claims, stateside): 365 days from date of service.
• •TRICARE — inpatient admission: 365 days from date of inpatient discharge.
• •TRICARE — overseas claims: 1095 days from date of service.

Source: TRICARE — Filing Tips (tricare.mil, official TRICARE program site), retrieved August 17, 2026. Verify with TRICARE West Region before relying on this for a claim.

Key TRICARE West Region billing terms

TRICARE West Region writes dental, medical, vision coverage across 27 states (AK, AZ, AR, CA, CO, HI, ID, IL, IN, IA, KS, LA, MN, MO, MT, NE, NV, NM, ND, OK, OR, SD, TX, UT, WA, WI, WY). This page draws on 97 indexed TRICARE West Region policy documents; every figure quoted below is linked back to the document it came from, and nothing is asserted that a source cannot support.

Payer ID

The electronic routing number that identifies TRICARE West Region to a clearinghouse. Submitting a claim with the wrong payer ID is one of the most common causes of a claim never reaching the payer at all - it rejects at the clearinghouse rather than denying, so it may never appear in your denial queue.

Timely filing limit

The window, counted from the date of service, within which TRICARE West Region will accept an initial claim. Filing past the limit is one of the few denials with no clinical defense - the claim is denied on receipt regardless of medical necessity. Limits differ by plan type and by whether you are in-network, so a single number rarely covers every TRICARE West Region product.

Prior authorization

Approval obtained from TRICARE West Region before a service is rendered. Requirements vary by CPT/HCPCS code, place of service, and plan. A service performed without a required authorization is typically denied as a provider write-off, meaning the balance usually cannot be billed to the patient.

Appeal deadline

The window for disputing a TRICARE West Region determination, counted from the remittance date rather than the date of service. Missing it usually forecloses the appeal entirely, so the deadline is worth calendaring the day the remittance posts.

How to verify TRICARE West Region coverage before you bill

1. 1

   Confirm eligibility and the specific plan

   TRICARE West Region is a payer, not a single benefit design. Coverage rules, prior-authorization lists, and filing windows differ across its commercial, Medicare Advantage, and Medicaid products. Verify which plan the member actually holds before applying any rule you looked up.

2. 2

   Find the coverage policy for the exact code

   Coverage is decided per CPT/HCPCS code, not per procedure name. Search the TRICARE West Region policy for the specific code you intend to bill, including the modifier where one changes the coverage story.

3. 3

   Check whether prior authorization is required

   Authorization requirements are code-and-place-of-service specific, and they change. Confirm the requirement for the date of service you are billing, not the date you are checking.

4. 4

   Run the code pair through NCCI edits

   Before billing two codes together, check the NCCI Procedure-to-Procedure edit and the Medically Unlikely Edit unit cap. A bundling edit that is not resolved with an appropriate modifier produces a denial that looks clinical but is purely a coding-edit problem.

5. 5

   Document medical necessity against the policy's own criteria

   When a policy lists coverage criteria, the documentation should address those criteria in the policy's own terms. An appeal grounded in the payer's published policy is materially stronger than one arguing general clinical merit.

6. 6

   Submit inside the filing window and calendar the appeal date

   Track the filing deadline from the date of service and, once a remittance posts, the appeal deadline from the remittance date. Both are absolute in a way clinical arguments are not.

Why TRICARE West Region claims get denied

The themes below are the ones that drive most A/R work. Each links to the CARC code that carries it on the remittance.

• Missing or invalid information — CO-16

  The claim reached TRICARE West Region but could not be adjudicated as submitted - a missing modifier, an incomplete field, or a required attachment. These are usually correctable and resubmittable rather than appealable.

• Prior authorization absent — CO-197

  The service required authorization that was not obtained, or the authorization on file does not match the code or date billed.

• Not medically necessary under the policy — CO-50

  TRICARE West Region applied a coverage policy and concluded the documentation did not meet its criteria. This is the denial most often overturned on appeal, because the argument is against a published standard you can read and answer point by point.

• Bundling and code-pair edits — CO-97

  The code is considered part of another service billed the same day. Resolvable when an NCCI modifier genuinely applies, and not when it does not.

• Filed past the deadline — CO-29

  The claim arrived after the filing window closed. Rarely recoverable absent documented proof of timely submission.

• Wrong payer or member not covered — CO-109

  The claim went to TRICARE West Region but the member's benefits sit elsewhere on that date of service - a different carrier, a different contractor, or a plan that had already terminated. Usually a front-desk eligibility problem rather than a billing one.

• Another payer should pay first — CO-22

  Coordination of benefits puts a different carrier in the primary position. The claim generally has to be worked through the primary payer before TRICARE West Region will consider it.

Coverage Types

Operating States

Common TRICARE West Region Policy Searches

• TRICARE West Region frequency limits for prophylaxis D1110
• TRICARE West Region prior authorization requirements for crowns
• TRICARE West Region missing tooth clause and waiting periods
• TRICARE West Region appeal process for denied claims

TRICARE West Region Billing FAQ

What is the TRICARE West Region timely filing limit?

TRICARE (all beneficiary/provider claims, stateside): 365 days from date of service; TRICARE — inpatient admission: 365 days from date of inpatient discharge; TRICARE — overseas claims: 1095 days from date of service. Source: TRICARE — Filing Tips (tricare.mil, official TRICARE program site), retrieved August 17, 2026. Confirm with TRICARE West Region before relying on this for a claim near its deadline.

What is the TRICARE West Region payer ID?

TRICARE West Region electronic claims use payer ID 99726 on the Stedi network. Enter it in loop 2010BB of the 837. Payer IDs are assigned per clearinghouse, so confirm it against your own clearinghouse's payer list.

How do I find TRICARE West Region prior authorization requirements?

Search Rette for the CPT code plus "TRICARE West Region prior authorization" (for example, "Does TRICARE West Region require prior auth for CPT 29881?"). Rette searches the 97 indexed TRICARE West Region policy documents and answers with the specific criteria, citing the source policy.

How many TRICARE West Region policies does Rette index?

Rette indexes 97 TRICARE West Region policy documents covering dental, medical, vision coverage. The index was last updated September 3, 2026.

Which states does TRICARE West Region operate in?

TRICARE West Region operates in AK, AZ, AR, CA, CO, HI, ID, IL, IN, IA, KS, LA, MN, MO, MT, NE, NV, NM, ND, OK, OR, SD, TX, UT, WA, WI, WY.

How do I appeal a denied TRICARE West Region claim?

Look up the denial code on Rette to decode the denial reason, then draft an appeal grounded in TRICARE West Region's own coverage policy. Appeal deadlines and submission instructions are listed on your TRICARE West Region EOB or remittance advice.

Where can I verify TRICARE West Region policies directly?

Always verify coverage decisions with TRICARE West Region before billing - the official TRICARE West Region website is https://tricare.triwest.com.

Related Payers