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Nurses & Staff
Hours & Location
The California Allergy & Asthma Medical Group Clinic

We specialize in the diagnosis and management of asthma, allergy and clinical immunology including conditions such as allergic rhinitis (hay fever), sinusitis, atopic dermatitis (eczema), food allergy, drug allergy, anaphylaxis (systemic allergic reactions), contact dermatitis, urticaria (hives), angioedema (swelling), conjunctivitis, primary immunodeficiency syndromes and many others.

We help patients determine the causes and treatment for symptoms such as nasal congestion, “sinus” symptoms, ear and eye symptoms, shortness of breath, wheezing, headache, chronic cough, recurrent respiratory and other infections, skin rashes, hives and others.

We offer all types of allergy testing, rhinoscopy, pulmonary function testing, nitric oxide testing, as well as allergen immunotherapy (allergy injections), intravenous immunoglobulin (IVIG) infusions, and anti-IgE (Xolair) injections if these are indicated.

Ricardo Tan, M.D.

Dr. Tan has been in private practice in Allergy and Clinical Immunology since 1996. He competed his fellowship training in Allergy and Clinical Immunology at the UCLA Medical Center in Los Angeles, California in 1995. He has been named a “Southern California Super Doctor” by Los Angeles Magazine in the field of allergy since 2010 to the present. Dr. Tan is a Diplomate of the American Board of Internal Medicine and the American Board of Allergy and Immunology. He is a Fellow of both the American Academy of Allergy, Asthma & Immunology ( AAAAI) and the American College of Allergy, Asthma & Immunology ( ACAAI) . He is a Past President of the Los Angeles Society of Allergy, Asthma & Clinical Immunology ( LASAACI).

He earned his medical degree from the University of the Philippines in Manila and completed his Internal Medicine residency at the State University of New York at Buffalo Residency Consortium in Buffalo, New York. He served as a Captain in the United States Air Force Medical Corps stationed in Del Rio, Texas from 1991-1993. He has served as an officer or committee member of many specialty societies, including the California Society of Allergy, Asthma and Immunology (CSAAI), and the International Association of Filipino Allergists & Immunologists (IAFAI). He is on the Editorial Board of the Annals of Allergy , Asthma and Immunology . He is the co-author of Practical Allergy, a textbook for primary care physicians, and has contributed chapters to Manual of Allergy and Immunology and other textbooks. He has published numerous articles in journals such as the Journal of Allergy & Clinical Immunology ( JACI) and the Journal of Asthma. He is very active in clinical research trials for new asthma and allergy medications.

Marion Susanne Johnson, M.D.

Marion Susanne Johnson, M.D., is a Diplomate of the American Board of Allergy and Immunology. She specializes in allergy, asthma, and clinical immunology, providing evaluation, testing, and treatment for allergic rhinitis, asthma, urticaria, contact dermatitis, eczema, immunodeficiencies, insect venom allergies, food allergies, and drug allergies.

Dr. Johnson is a fellow of the American College of Allergy Asthma and Immunology and a fellow of the American Academy of Pediatrics. Dr. Johnson received her Bachelor’s degree in Human Biology from Stanford University and earned her medical degree from the University of California at San Francisco. She completed residency training in Pediatrics at UC Irvine and Bellevue/NYU. After working in the fields of Pediatrics and Public Health Administration, she completed an allergy and immunology fellowship at Kaiser Los Angeles Medical Center.

She has been a member of the Los Angeles Society of Allergy Asthma and Immunology, the Los Angeles Pediatric Society, the American Academy of Pediatrics, the American College of Allergy and Immunology, the Association of Black Women Physicians, and the Charles R. Drew Medical Society. She has served on the boards of the American Cancer Society, the Association of Black Women Physicians, and the Allergy and Asthma Foundation of America.

She believes that one cannot have a healthy society without promoting individual well-being. While optimal health is each individual’s prerogative, she believes each person should have an opportunity to live a healthy life that makes a difference.

Dr. Johnson has been pleased to serve the needs of her patients and the Southern California community for 25 years.

Nurses & Staff

Front Staff
Our clinic staff is focused on your comfort and the success of your treatment. We have ass585embled a team of nurses, assistants, and office personnel whom are professional and understand the importance of your health and happiness.

Sharon Short, Office Manager
Joan Nasr, RN
Cheryl Brown, Receptionist
Maya Johnson, MA
Hours & Location

NOTE: For specific medical questions, please do NOT use email, but call the office directly. If you are experiencing a medical emergency, call 911.

California Allergy and Asthma Medical Group hasone (1) location serving the Los Angeles area. See below for more information about our office.
Los Angeles - Main Office
Main Office:
1950 Sawtelle Blvd, Suite 138
Los Angeles, CA 90025
(310) 966-9022

Our Los Angeles office is located just west of 405 Freeway and north of the 10.

Click here for directions.
MONDAY 8:00 am - 7:00 pm
TUESDAY 7:00 am - 5:00 pm
WEDNESDAY 8:00 am - 5:00 pm
THURSDAY 8:00 am - 5:00 pm
FRIDAY 8:00 am - 5:00 pm
SATURDAY 8:00 am - 12:00 pm


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