MEDI-CAL Becoming a Provider



Already part of the Care1st Provider Network?

Already part of the Care1st Provider Network and need to report a change to your practice?

If you are already contracted with Care1st and would like to report a change to your practice, you can advise us regarding what has changed through the followings:

Provider Network Operations (PNO) - Los Angeles Providers
By Telephone: 1-800-468-9935 option 7
Fax: (323) 889-5418
E-mail at: Care1stDemographic.Updates@blueshieldca.com
Completing an online interface for providers to submit verification
Provider Network Operations (PNO) - San Diego Providers
By Telephone: 1-800-468-9935 option 7
Fax: (619) 528-4820
E-mail at: Care1stSD.Demographicupdates@blueshieldca.com
Completing an online interface for providers to submit verification

Here are examples of changes providers can submit to us:

  • Change of address
  • Closing a location
  • Moving to a new location
  • Update phone number or fax number
  • No longer contract with Care1st
  • Copy of W9

Providers are required to notify Care1st or the PPG within five (5) business days when either of the following occurs:

  1. When the provider had previously accepted new patients and the provider is not currently accepting new patients
  2. When the provider had previously not accepted new patients and the provider is currently accepting new patients

Interested in becoming part of the Care1st Provider Network?

If you are an Ancillary provider who is interested in joining our network, you can submit a Letter of Interest through the following:

By Email: Lettersofinterest@care1st.com
By Fax: (323) 889-5417
By Mail:
Blue Shield of California/Care1st Health Plan
601 Potrero Grande Dr.
Monterey Park CA 91755
Attention: Contracting

Please include the following information when submitting your Letter of Interest:

  • W/9
  • NPI Registry
  • Service Area by city and county
  • Specialty services (Ex: Equipment, Bariatric, Languages)
  • Proof of enrollment (within 12 mos for new providers) with Medicare and Medi-Cal Line of Business
  • Professional Liability Insurance Certificate (Min. requirement $1m per occurrence/$3m in aggregate)

Please note:

90 day minimum turnaround for review of complete submissions Partial/Incomplete submissions will not be considered until all required documentation is received. Do not email for status To obtain information regarding this submission, please contact the Contracting department at: (323) 889-6638 ext 6109.

All other Contract changes or updates should be sent in writing to:

Blue Shield/Care1st Health Plan
601 Potrero Grande Dr.
Monterey Park CA 91755
Attention: Contracting Department

Please include a current signed W9 with your request.