- Kaiser CSI California Select for Individuals94320
- Kaiser Foundation Health Plan Colorado100173
- Kaiser Foundation Health Plan Georgia21313
- Kaiser Foundation Health Plan Hawaii94123
- Kaiser Foundation Health Plan Mid-AtlanticKSRA
- Kaiser Foundation Health Plan Northern CaliforniaKSRCN
- Kaiser Foundation Health Plan Northwest100178
- Kaiser Foundation Health Plan Southern California94134
- Kaiser Foundation Health Plan Washington91051
- Kaiser Permanente
- Kalos Health40137
- KAMG HospitalGSH02
- Kane County Independent Practice AssociationKCIPA
- Kansas City Life Group BenefitsCX058
- Kansas Health Advantage71066
- Katy Medical GroupKMG11
- Kaweah Delta Medicare AdvantageIP084
- Keenan and AssociatesKEE01
- Keenan and Associates (Excluding City of Pasadena)J1498
- Kellogg CompaniesJ1803
- Kelly Benefits23274
- Kelsey-SeyboldKELSE
- Kemper PreferredC1030
- Kempton Group73100
- Ken Davis Industries IncorporatedJ1079
- Kent County Health PlanKENT1
- Kern County Health & Wellness22149
- Kern Family Health Care77039
- Kern Legacy Health Plans89890
- Key Benefit Administrators37323
- Key Benefit Administrators11067
- Key Health Medical Solutions Incorporated95460
- Key Medical GroupIP082
- Key Risk Management Services LLCJ1521
- Key Select37321
- KeyCare AdvantageKCMD1
- Keystone First23284
- Keystone First CHIP30070
- Keystone First Community HealthChoices42344
- Keystone First VIP Choice77741
- Keystone Health Plan East
- Keystone Health Plan East95056
- Keystone Mercy Health PlanKYMHP
- Kindbody35463
- Kinetic ConceptsJ1078
- Kirkland's IncorporatedJ1614
- Klais and Company (Part A and Part B)80089
- KlyreRP132
- KM Strategic ManagementHCMG1
- Know The Costs04430
- Koan Risk Solutions65871
- Kopp Billing Agency Inc.RP091
- Kova Healthcare IncorporatedKOVA1
- KSKJ Life10748
- Kuspuk School District57610