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Contact Us

Imperial Health Holdings is committed to supporting our provider partners with responsive service, streamlined communication, and accessible resources to ensure high-quality, coordinated care.

Our Focus for Providers:

Supporting efficient care delivery: We work closely with providers to reduce administrative burden and improve workflow efficiency.

Improving patient outcomes: Through coordinated utilization management, eligibility support, and clinical collaboration.

Ensuring compliance and integrity: We uphold regulatory standards while offering confidential reporting and compliance support.

Corporate Office

Address: 1100 E Green St, Pasadena, CA 91106

General Number: 626-838-5100

Contracting: Imperial Health Contract Inquiry Application

Provider Portal Inquiry: portal@imperialhealthholdings.com

Utilization Management (UM)

Phone: 626-598-3099

Outpatient Fax: 626-283-5021

Inpatient Fax: 626-380-9134

Eligibility, Benefits & Provider Services

Imperial Health Plan of CA (H5496): 800-830-3901

Imperial Insurance Companies, Inc – EXAZ / EXTX / EXNV: 800-595-0619

Imperial Insurance Plan of the SW – EXUT:
800-595-0619

Imperial Health Holdings (IHHMG): 626-838-5100

Health Cosmos – AZ: 602-830-1830

Health Cosmos – NV: 725-500-5655

Health Cosmos – NM: 505-966-9777

Lonestar: 806-853-8331

 
Claims

Claims Inquiries: 800-778-9302

CompanyEDI Payor IDClaims PO Box Address
Imperial Health Holdings (IHHMG)IHHMGPO Box 60075 Pasadena, CA 91116
Imperial Health Plan of CA (H5496)IHP01PO Box 60874 Pasadena, CA 91116
Health Cosmos – AZCOSAZPO Box 61160 Pasadena, CA 91116
Health Cosmos – NVCOSNVPO Box 61210 Pasadena, CA 91116
Health Cosmos – NMCOSNMPO Box 60530 Pasadena, CA 91116
LonestarLNSTRPO Box 61150 Pasadena, CA 91116
IIC – EX AZIEXAZPO Box 60567 Pasadena, CA 91116
IIC – EX TXIEXTXPO Box 61300 Pasadena, CA 91116
IIC – EX NVIEXNVPO Box 60590 Pasadena, CA 91116
IIC – EX UTIEXUTPO Box 60190 Pasadena, CA 91116
Compliance

Anonymously Call: 888-708-5377

Anonymously Send: IHP NavexOne Portal

Fax: 626-380-9054

Email: complianceFWA@imperialhealthplan.com

Mail: Compliance FWA, PO Box 60874 Pasadena, CA 91116
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