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- City of Westminster (California)J1700
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- ClaimChoice83063
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- CMO - The Care Management Company101222
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- Coachella Medical GroupCOMG1
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- Coastal Administrative ServicesCAS89
- Coastal Care Services47394
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- Coastal TPA77052
- Coca-Cola Enterprises IncorporatedJ1038
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- Cofinity - Group Resources42049
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- Community Health Alliance35193
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- Community Health Options45341
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- Community LIFE23283
- CommunityCare73143
- CommunityCare IPAAMM12
- Companion Life48005
- Companion Life Insurance Company of California (LOB CLIC)2838
- Companion Property and Casualty Insurance CompanyJ1829
- Compass Group USA IncorporatedJ1040
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- Complete Senior Care, PACER3485
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- CompWestJ1925
- Con-way IncorporatedJ1844
- Concentrix Insurance Solutions19028
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- ConnectiCare101259
- Connecticut Behavioral Health PartnershipBHOCT
- Connecticut Carpenters Health Fund37307
- Connecticut Carpenters Health PlanTLU56
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- Consociate Health37135
- Consociate Health for Cancer and Transplant12132
- Consolidated Associates Railroad75284
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- Consumers' Choice Health SC45321
- Container Graphics Corporation08680
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- Contessa HealthCH201
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- Continental AirlinesJ1042
- Continental GeneralCGIMS
- Continental Western Insurance Company (CWG)J1274
- Continuum Health Solutions LLC46478
- Continuum Health Solutions LLC - Worker Compensation59557
- Contra Costa Behavioral Health PlanCCMHP
- Contra Costa County Schools Insurance Group (CCCSIG)J1715
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- Convergys CorporationJ1043
- Cook Children's Health Plan (CHIP)CCHP1
- Cook Children's Health Plan (STAR)CCHP9
- Cook Group Health Plan35149
- Cook Medical Group60065
- Coordinated Care (Ambetter WA)
- CopperPoint Insurance Companies19416
- Coralisle Group22284
- Coralisle Group22286
- Coralisle Group22287
- Coralisle Group22285
- Core Benefits Multimatic Tennessee LLC47165
- Core Management Resources GP58231
- CoreCivicJ1942
- CoreCivic55962
- CoreSource (FMH)10311
- Corinthian CollegesJ1517
- Cornerstone Benefit Administrator16615
- Cornerstone Hospice and Palliative Care, Inc.RP111
- Cornerstone Preferred ResourcesCB268
- Corporate Plan Management Incorporated64270
- CorrectCare (Georgia Correctional Healthcare Adult Health)GCHCAH
- CorrectCare (Louisiana Prisons and Parish Jails)LADOC
- CorrectCare Integrated HealthCCIH
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- Correctional Health PartnersPHPMC
- Correctional Management ServicesJ1044
- Corrections Corporation of AmericaJ1045
- CorVel Corporation
- Cottingham and Butler Claims Services IncorporatedJ1683
- Country Casualty Insurance CompanyJ1684
- Country Insurance Modern Services Casualty Insurance CompanyJ1712
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- Country Insurance Mutual Service Insurance Preferred Insurance CompanyJ1591
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- County of Humboldt (California)J1603
- County of KernJ1935
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- County of Santa Barbara (California)J1631
- County of Shasta (California)J1616
- County of Sonoma (California)J1662
- County of Tulare (California)J1666
- CountyCare06541
- Coventry Health Care Inc (Promina)00193
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- COVET98480
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- Cow Creek Band of Umpqua Tribe of Indians (CCBUTI)98477
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