Patient Registration

Thank you for choosing the Arthritis Center as a health care provider. Dr. Baak and our very talented team at the Arthritis Center look forward to serving you.


 Dr. Baak is on staff at DePaul Hospital and continues to have access to your medical records. Send us an email and you will receive an email back to register with our office and schedule your next appointment or infusion.  You can also call our office at 314-942-6464. Your call will be returned within 24 hours.

Insurance Information

Insurance currently accepted:

*Insurance may require a referral, consult your primary care physician


  • Aetna
  • Atna Medicare HMO
  • Anthem:
    • Blue Access
    • Blue Preferred
    • Medicare Advantage
    • Blue Access Choice
    • Traditional
    • Pathway/Pathway X
  • Cigna
  • Coventry*:
    • Gold Advantage Medicare*
    • Fully Insured
    • IBEW and UMR
    • National Netwo
    • Carpenter's
    • Medicare Advantage and Advantra*
    • National (First Health/Mail Handlers)
  • Essence*
  • Exclusive Choice
  • HealthLink

Insurances currently accepted continued:


  • Humana:
    • Choice Care
    • Choice Care PPO Plus
    • Commercial POS/EPO
    • National POS/Open Access Plus
    • GE Health Preferred
    • P&G National POS
    • St. Joesph Hosp POS
    • Us Bank
    • Medicare PPO/Employer PPO Plus
  • Missouri Care Health Plan
  • Medicaid (as secondary insurance)
  • Medicare
  • Tricare*
  • United Health Care*:
    • UHIC AARP Medicare HMO
    • UHC Core, Choice Plus, Charter
    • UHC Option PPO Select, Compass
    • UHC Navigate*
    • UHC Golden Rule*

Insurances currently NOT accepted:

  • AARP (as Primary Insurance)
  • Aetna Better Health
  • Cigna: EPOConnect
  • Coventry: Total Care
  • Coventry: Carelink
  • Covenrty: Improvement PLUS
  • Coventry: ONE Products


Need additional financial help?

Click the button below to learn about the CareCredit Program: