Zenith Insurance provider portal, phone and payer ID quick facts
| Provider portal | https://www.thezenith.com |
|---|---|
| Provider phone | 1-877-682-3660 |
| Claims payer ID | Verify in clearinghouse payer list |
| Eligibility payer ID | Not established in this registry; verify with clearinghouse |
| ERA payer ID | Clearinghouse-specific |
| Timely filing | 365 days (verify applicability) |
| Prior auth route | Provider portal or policy document |
| Last reviewed | 2026-04-23 |
- This registry has not established a payer-specific appeal ladder for Zenith Insurance. Use the denial notice, plan document, provider agreement, or jurisdictional rule to assign the correct route and deadline. Missing registry evidence does not mean appeal rights are unavailable.
- This registry has not established one national ERA payer ID for Zenith Insurance. ERA enrollment and 835 routing are clearinghouse- and product-specific; verify in the payer portal or clearinghouse payer list before enrollment.
Zenith Insurance at a glance
| Legal name | Zenith Insurance Company |
|---|---|
| Also known as | Zenith National |
| Category | Workers' compensation |
| Parent organization | Fairfax Financial Holdings |
| Claims payer ID | Not established in this registry |
| Eligibility (270/271) payer ID | Not established in this registry |
| ERA (835) payer ID | Clearinghouse-specific |
| NAIC company code | Not established in this registry |
| States covered | Nationwide (50 states) |
| Provider portal | https://www.thezenith.com |
| Provider phone | 1-877-682-3660 |
Always verify claims-routing details against the member ID card and the payer's current EDI companion guide before submission.
Timely filing & appeals for Zenith Insurance
This registry lists 365 days as an initial-claim reference for Zenith Insurance. Confirm the applicable product, provider agreement, start event and current payer instructions. Do not apply this value automatically to out-of-network, secondary, corrected or appealed claims.
| Submission type | Window |
|---|---|
| Initial claim reference | 365 days (verify applicability) |
| Out-of-network initial claim | Verify the member's plan and applicable out-of-network rules |
| Secondary / coordination of benefits | Verify the allowed window and start event; a primary EOB does not automatically restart filing |
| Corrected claim | Verify correction instructions; do not substitute an appeal deadline |
| Reconsideration / appeal | Use the applicable denial or decision notice and the process below |
This registry has not established a payer-specific appeal ladder for Zenith Insurance. Use the denial notice, plan document, provider agreement, or jurisdictional rule to assign the correct route and deadline. Missing registry evidence does not mean appeal rights are unavailable.
Source: Zenith Insurance provider policy. Always confirm before disputing a TFL denial — payer policies are versioned and product-specific.
Prior authorization with Zenith Insurance
Decision deadlines depend on the product, service and urgency. CMS-0057-F generally starts its decision-timeframe requirements in 2026 for Medicare Advantage, Medicaid and CHIP payers subject to the rule: seven calendar days for standard requests and 72 hours for expedited requests. Those requirements exclude drug authorizations and QHP issuers on the federally facilitated exchanges. Other plans, state rules and permitted extensions can differ. Check the applicable policy; a decision deadline is not a guarantee of approval.
CMS-0057-F decision-timeframe requirements and exclusions
Zenith Insurance does not currently accept X12 278 prior-authorization transactions; submit via portal or fax. The procedures most commonly subject to prior authorization include advanced imaging, inpatient admissions, specialty pharmacy, and certain outpatient surgical procedures. Use the payer's authorization tool below to confirm requirements per CPT before scheduling a service.
Zenith Insurance maintains a live prior-authorization code lookup tool that supersedes any cached list. Use the provider portal or the policy documents below to confirm the current PA list before rendering a service.
Top denial reasons for Zenith Insurance
Per-payer denial benchmarks publish here once the QuickIntell anonymized ETL pipeline ingests sufficient Zenith Insurance volume. Until then, see the broader CARC reference for industry-wide remediation guides.
Electronic claims, eligibility & ERA
| Transaction | Supported | Payer ID |
|---|---|---|
| 837P / 837I claims | Yes | — |
| 270 / 271 eligibility | No | — |
| 278 prior authorization | No | Verify X12 278 routing separately |
| 835 ERA | No | Clearinghouse-specific |
Payer IDs vary by clearinghouse — confirm against your clearinghouse payer list (Availity, Change Healthcare/Optum, Waystar) before configuring submitter routing.
QuickIntell coverage for Zenith Insurance
Frequently asked questions about Zenith Insurance
Where is the Zenith Insurance provider portal?
The Zenith Insurance provider portal is available at https://www.thezenith.com. Use it for eligibility checks, claim status, prior authorization workflows, appeals, and payer-specific routing updates. QuickIntell links to the payer's provider-facing portal as a reference and is not the official payer portal.
What is the timely filing limit for Zenith Insurance?
This registry lists 365 days as an initial-claim reference for Zenith Insurance. Confirm the applicable product, provider agreement, start event and current payer instructions. Do not apply this value automatically to out-of-network, secondary, corrected or appealed claims.
Does Zenith Insurance publish a single claims payer ID?
This registry has not established one claims payer ID for Zenith Insurance. Look up the correct ID for the member's plan and transaction in your clearinghouse directory and verify against the member ID card before submission.
Does Zenith Insurance accept electronic claims?
Yes — Zenith Insurance accepts ANSI X12 837P and 837I electronic claims through standard clearinghouses. Real-time eligibility (270/271) is not currently supported and X12 278 prior authorization is not currently supported.
How do I appeal a Zenith Insurance denial?
This registry has not established a payer-specific appeal ladder for Zenith Insurance. Use the denial notice, plan document, provider agreement, or jurisdictional rule to assign the correct route and deadline. Missing registry evidence does not mean appeal rights are unavailable.
How long do Zenith Insurance prior authorization approvals take?
Decision deadlines depend on the product, service and urgency. CMS-0057-F generally starts its decision-timeframe requirements in 2026 for Medicare Advantage, Medicaid and CHIP payers subject to the rule: seven calendar days for standard requests and 72 hours for expedited requests. Those requirements exclude drug authorizations and QHP issuers on the federally facilitated exchanges. Other plans, state rules and permitted extensions can differ. Check the applicable policy; a decision deadline is not a guarantee of approval.
What is the Zenith Insurance provider phone number?
This registry lists 1-877-682-3660 as a provider contact for Zenith Insurance. Confirm the service scope and the number on the member ID card; claim, eligibility and authorization inquiries may use different teams. Have the member ID, date of service and tax ID ready. The provider portal is https://www.thezenith.com.
Automate workflows around Zenith Insurance requirements
Connect eligibility, prior authorization, pre-submission claim checks, and remittance routing in one governed workflow. Payer and plan configuration is confirmed during implementation.
Disclaimer
This page is operational reference for medical-billing professionals. It is not legal, clinical, or contractual advice. Payer policies change without notice — always verify against Zenith Insurance's current published documents before submission. CPT® is a registered trademark of the American Medical Association.