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Mark D. Weissig, MD
Practice accepting new patients.

Mark D. Weissig, MD

(714) 626-8650
Primary Specialties
  • Pulmonology
    (Board Certified)
Secondary Specialties
  • Internal Medicine
    (Board Certified)
Medical Groups & Affiliations
  • St. Jude Heritage Medical Group
  • Additional Languages Spoken

Primary Office

St. Jude Heritage Medical Group
2141 North Harbor Boulevard
Suite 25000
Fullerton, CA 92835
(714) 626-8650
(714) 626-8696
Web Page:
Recommend this Physician
4.8 out of 5 (143 Ratings | 5 Comments)


The doctor provided me the concerns about my health situation and explained in depth how to take my new medications.
Dr. Weissig is one of the best doctors I have ever seen. He has very good interaction with me. He is extremely good at diagnosing problems. I specifically asked him for clarification on how loss of weight might improve my health. His explanation was realistic, but encouraging, and showed thoughtfulness and care. I admire him greatly.
the best.
Always good experience.
I have had talk with doctor & hoping things better. I do respect doctor or would not continue. Too many patients!
5 Total Comments


  • Medical School:
    Duke University School of Medicine
  • Internship:
    Duke University Medical Center
  • Residency:
    Duke University Medical Center
  • Fellowship:
    UCLA School of Medicine
  • Board Certified in Internal Medicine
  • Board Certified in Pulmonology

Areas of Interest

Asthma, Sleep disorders, COPD, Smoking Cessation, Pulmonary Fibrosis

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