We are a group of physicians who have been serving the Greater Long Beach and its surrounding communities for over 30 years. We specialize in the diagnosis and treatment of kidney diseases and hypertension.

We provide comprehensive office consultation and management, as well as in-hospital services. In addition, we oversee chronic dialysis treatments on a regular basis and participate in the long-term management of kidney transplant patients.

We have been on the forefront of health information technology, having fully implemented a comprehensive electronic medical record system since 2005 that has helped to improve the overall quality of care provided, enhanced patient safety and facilitate communication with other healthcare professionals.


Specialists in kidney diseases and hypertension


  1. Alan Erlbaum, M.D.

  2. Karen Zoller, M.D.

  3. Essam Maasarani, M.D.

  4. John Hsieh, M.D.

  5. Alice Park, M.D.


  1. 3780 Kilroy Airport Way

   suite #115

   Long Beach, CA 90806

  1. 1045 Atlantic Ave

   suite #108

   Long Beach, CA 90813

  1. 10861 Cherry Ave

   suite #104

   Los Alamitos, CA 90720


   (562) 595-7426


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