City of Oxnard Changes TPA

City of Oxnard Changes TPA

Third-Party Administrator (TPA) Acclamation Insurance Management Services (AIMS) is having a rough summer, as various self-insured employers switch from AIMS, choosing instead to entrust claims administration for their injured workers to other companies.

As of July 1, 2022 the City of Oxnard utilizes CorVel to manage all municipal employees’ claims. Importantly, claim numbers are changing with this switch; AIMs claim numbers no longer apply.

Yes, for every injury, you will need to contact CorVel to obtain the new claim number. Below, providers can find the telephone number to call CorVel.

City of Oxnard: Goodbye AIMS, Hello CorVel

It is critical for self-insured employers to choose their TPA wisely. daisyBill helps self-insured employers with this choice by publishing California compliance data for all claims administrators, including CorVel.

CorVel has assigned new identifying claim numbers to the transferred claims, which start with ‘1626-WC-’.

Prior to submitting a City of Oxnard bill to CorVel, we recommend that providers:

  1. Contact CorVel at (888) 726-7835.
  2. Obtain the new CorVel claim number, and
  3. Verify the patient demographics and injury date with CorVel. 

Providers should note that:

  • CorVel accepts e-bills directly from providers, functioning as its own clearinghouse.
  • CorVel also assigned the City of Oxnard a new Payer ID: E2144
  • Providers should submit all Second Review appeals for Oxnard bills to CorVel, including bills initially submitted to AIMS.

Notably, the City of Oxnard is not the only self-insured public employer to recently switch from AIMS to a different TPA.

When doctors cannot count on timely, correct reimbursement, the pool of providers willing to treat injured workers shrinks, leaving those workers with less access to care. The best way for self-insured employers to ensure their employees’ access to care? Choose a TPA with a strong record of ensuring compliance on the employer’s behalf.


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