Below are a list of the more frequently-used networks in Arizona and the website that you can access to view the most updated list of providers on those networks. While most carriers provide  you with a book when you enroll in a plan, these websites are updated on a fairly regular basis.

Our thanks to Michael Malasnik at Arizona Benefits Connection for putting together this list!
 

Admar Inc.
http://www.admarinc.com/PROVIDER_DIRS.HTM

Aetna
http://www.aetna.com/help/faq_provider.html#question1

APIPA (Arizona Physicians)
http://www.myapipa.com/

AZ Foundation for Medical Care (formerly the Maricopa Foundation) -- this PPO network
is utilized by numerous plans offered by several carriers: USL, American Community, John Alden, Fortis, Continental General...
and more
http://www.azfmc.com/

Beech Street
http://beechplus.beechstreet.com/IPLU/splash.jsp

Blue Cross Blue Shield of AZ
http://www.bcbsaz.com/providers/index.asp?market=provider

CCN
http://www.ccnusa.com/dol/

Cigna
http://cigna.benefitnation.net/cigna/docdir.aspx

Galaxy
http://www.galaxyhealth.net/AE3C797524CBB55ADE7FD71AFCF94210/default.html

Healthnet of AZ
http://www.az.healthnet.com/docsearch/default.asp

Humana
http://pfp.humana.com/ProviderPFP/MarketFinder.asp

Mercy Healthcare
http://www.mercycareplan.com/NewProvider_Dir.asp

NPPN (National Preferred Provider Network)
http://provlookup.nppn.com/NetDynamics/NetDynamics50/plugin.nd/PrvLookup/pgCommon

One Health Plan
http://www.onehealthplan.com/provdir/srch/psrchfs.html

Pacificare
http://www.pacificare.com/region/home/0%2C2654%2C6614_14256%2C00.html

PHCS (Private Health Care System)
http://www.geoaccess.com/phcs/po/

TriCare-TriWest
http://www.triwest.com/searchresults.asp

United American Insurance Company
http://www.providerlocator.com/search.cfm?code=uap

United Healthcare
http://www.uhc.com/WhatWorksForYou/0,1456,pageID%3D192,00.html

US Healthcare Association
http://www.ushamember.com/lookupprov.htm