Insurance Companies / insurance forms:

• Aetna
• Cigna Behavioral Health provider site
• Cigna Behavioral Health: Provider Relations Contacts
• Magellan  
• Magellan EAP forms
• Magellan Clinical forms
• Magellan Request for Additional Visits
• Corphealth
• MHN
• Oxford Health Plans
• Pacificare Behavioral Health
• PsychCare
• Tricare
• Tricare North Behavioral Health
• Tricare West (TriWest) provider forms (Scroll down for Behavioral Health)
• Humana Military Healthcare Services/ValueOptions (Tricare South)
• United Behavioral Health    
• United Behavioral Health Wellness Assessment –Adult 
• United Behavioral Health Wellness Assessment – Child
• United Behavioral Health Psych Testing Request Form
• United Healthcare
• ValueOptions 
• ValueOptions Outpatient Registration Form (ORF) #1
• ValueOptions Outpatient Registration Form (ORF) #2
• ValueOptions Medication Management Registration Form
• Wellpoint Behavioral Health

Other sites that might be useful to you:   

• Blue Card Doctor/Hospital Finder 
• Centers for Medicare & Medicaid Services (CMS)
• Medicare Call Center Toll-Free Numbers Directory (scroll down; it's #4 under "downloads)
• National Provider Identifier
• Place of Service Codes for Professional Claims