Patient resources

Referral Guidelines

Please review these referral guidelines before checking referral status or following up with an approved provider.

Referral approval reminder

Only your HMO group can authorize referrals. Our help desk staff can send referrals on your behalf, but they cannot approve referrals for you.

Please be mindful of the following guidelines

  • You can choose to wait until your HMO group sends you a letter by mail with approval or denial confirmation. For a faster response, follow the instructions below.
  • Only your HMO group, listed below, can authorize your referrals.
  • Our help desk staff can only send referrals on your behalf. We cannot approve them for you.
  • Please call your HMO group to check the status of referrals sent and to receive further instructions on how to follow up with approved providers.
  • For new patients, it may take up to 2 weeks for your HMO group, listed below, to add you to their portal.
  • Referrals can be submitted only after your name is added to the HMO portal. Please call the HMO group to confirm.
  • These notes refer to your HMO group, not your health plan such as Anthem, Blue Shield, Blue Cross, Cigna, Aetna, Health Net, or similar plans. Your health plan may assign you under our group, but those changes may not automatically appear on the HMO portal for verification.
  • Thrive Comprehensive Medical Group takes no responsibility for changes in selected provider names that are directly caused by your medical group referrals personnel. We allow our patients to select their own preferred providers for referral. However, your HMO group may independently change the provider we placed for you to direct care to its own preferred providers. Please call the HMO group directly to change the selected provider to your preferred provider.

We understand that these issues may cause delays, but we have no control over how HMO groups handle the requests we submit on your behalf.


HMO group contact information

Regal / Lakeside Medical Group

  • Authorizations Direct: 818-637-2000
  • Main Line: 818-654-3490
  • Customer Service: 1-866-654-3471 — Option 1, then Option 1
  • Fax: 818-933-0571 or 818-933-0584

Providence Care Network

  • Authorizations: 855-359-6323
  • Fax: 747-229-2360

Axminister Medical Group

  • Authorizations: 855-359-6323
  • Fax: 747-229-2359

Imperial Health Holdings Medical Group

  • Authorization office: 626-838-5100
  • Fax: 626-283-5021

Healthcare Partners / Optum Care Network

  • Authorizations: 818-205-0900

Brand New Day

  • Authorization: 657-400-1205
  • Fax: 657-400-1240

Referral contact details and HMO portal timelines may change. Please call the applicable HMO group directly to confirm referral status and provider instructions.