Mark D. Weissig, MD
Fullerton, CA 92835
- Mission Heritage Medical Group and Affiliated Physicians
- St. Joseph Heritage Medical Group and Affiliated Physicians
- St. Jude Heritage Medical Group and Affiliated Physicians
St. Jude Heritage Fullerton - Plaza
2141 North Harbor Boulevard, Suite 25000, Fullerton, CA 92835
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About Mark D. Weissig
Dr. Mark Weissig is a pulmonologist in Fullerton, California and is affiliated with St. Jude Medical Center. He received his medical degree from Duke University School of Medicine and has been in practice for more than 20 years.
Duke University School of Medicine
InternshipDuke University Medical Center
ResidencyDuke University Medical Center
FellowshipUCLA School of Medicine
- American Board of Internal Medicine, Internal Medicine
- American Board of Internal Medicine, Pulmonary Disease

Providence St. Jude Medical Center
Community Reviews
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As part of ensuring you have a positive experience with Providence, our online provider directory includes ratings and patient comments for select providers. More about our survey.
I can always depend on Dr Weissig's judgment, even if it isn't his field of expertise.
Providence Patient
Dr Weissig is amazing!Brilliant and caring.A true asset to your organization.
Providence Patient
Compassionate and willing to explain in detail. Took every effort to communicate
Providence Patient
Very courteous team, starting from the doctor till the clerks and receptionist. Extremely satisfying experience.
Providence Patient
Dr. Weissig always persues my symptoms with further testing and referal when warranted. I feel he is more than a pulmonologist, a total health advocate.
Providence Patient
Dr Weissig is One of the best doctors there is! He is Wise, professional, caring, & respectful! I feel human when I see him
Providence Patient
Very nice
Providence Patient
Appreciate drs knowledge of my condition
Providence Patient
Thanks to Dr waissing he is pretty helpful you are lucky to have him is the vest Dr. Thank you very much.
Providence Patient
He cares and takes my healthcare seriously
Providence Patient
Very satisfied.
Providence Patient
Was a good visit for me.
Providence Patient
Dr Weissig was very on top of my health concerns. My blood pressure was [ID]. He personally took me to Emergency and helped me get admitted. He is very caring and on top of things. He's the best
Providence Patient
Dr. Is compassionate and caring. Advice not overbooking.
Providence Patient
The Dr was excellent.
Providence Patient
I have the highest regards for Dr. Wessig. He is helpful, always make sure I understood, and is easy to talk to. Wouldn't see a different doctor.
Providence Patient
We are so pleased with my care and the concerns dr Weissig shows He is always on top of my medical problems and I am receiving the best care and treatment thank you so much for all the good care
Providence Patient
My pulmonologist is the only reason why I've been with Providence this long. He takes the time to listen and helps me with other health related issues that my PCP was neglecting. All providers should take notes from Dr Weissg on bedside manner and patient empathy. He is a rare find!
Providence Patient
Excellent care and staff and Dr Weissig are the best!
Providence Patient
Dr Weissig is caring, knowledgeable and professional.
Providence Patient
Dr Weissig, his medical staff and receptionist are all professional and courteous. I would recommend this medical practice to anyone looking for a new physician.
Providence Patient
Dr. Weissig is highly competent and knowledgeable as a professional.
Providence Patient
He is very caring, and wants the best for my health.
Providence Patient
Dr. Weissig is a very caring Doctor, he looked through my test results, explained to me in a way I could understand, he is very patient and attentive. Thank you, Dr. Weissig.
Providence Patient
Dr Weissig is caring and so knowledgeable about medicine.
Providence Patient
Dr. Weissig was very responsive to my questions about my condition and diagnosis and actually looked up past test results which then promoted a change in the condition being reported.
Providence Patient
Excellent Doctor and very professional which extends to his staff.
Providence Patient
So caring! Just as excited as I was about the improvement
Providence Patient
Dr Weissig is such a nice, knowledgeable doctor. He knows my situation very well and relates to the results of testing to diagnose where I stand at the time and what to do about it next. He is easy to talk to and take the time to listen to all my concerns and questions.
Providence Patient
This was routine exam requested by my primary.
Providence Patient
This was a follow up for constant cough and a check on asthma symptoms and to see if inhaler was helpful. Dr Weissig is alway so thorough and highly professional in taking care of my medical needs. When changing meds he always advised that I call the office in a week to let them know how I'm doing.
Providence Patient
Provider had not reviewed my history and files prior to seeing me.
Providence Patient
Great service
Providence Patient
Doctor Weissig is probably the best doctor you have on staff. I have gone to him for many years, I have recommended many of our friends to him,they all adore and admire him like I do. If you had atleast 50 more doctors like Dr.Weissig, your hospital you would be one of the top hospitals in the state.. And I not exaggerating.... He's the BEST....
Providence Patient
The provider was very patient and courteous, answering many questions from my wife who has limited English language skills. I also appreciated his excellent treatment of my concerns and health.
Providence Patient
Dr. Weissig is a wonderful physician. He Is an expert In his area of medicine. He Is a great listener, his exams are comprehensive, detailed, and helpful. We think Dr. Weissig Is an excellent doctor and we are blessed to have him as our pulmonary doctor.
Providence Patient
Dr. Weissig is the best! I wish he could be my primary physician.
Providence Patient
Dr Weissig is a kind and caring physician.
Providence Patient
As always, Dr.Weissig and his team are tops! Dr.Weissig is very professional and patient, careful to take time necessary to detail findings/observations. He is also very positive about a patient's success in following protocols and getting results. It is always evident that he keeps up wt research in his field which is very important. Great physician.
Providence Patient
Dr Weissic provided excellent service! His assist & staff were excellent.
Providence Patient
Dr. Weissig always seems to take a personal interest in your medical needs/conditions.
Providence Patient
I love this Doctor.He is extremely through. I wish all my Doctors were more like him.
Providence Patient
Dr Weissig is very thorough and explains things in a way that Is easy to understand
Providence Patient
Dr. Weissig Is thorough and listens - not just to my lungs , but to what I say as well. He reviewed the unrelated health issues I experienced earlier in the year and talked about how they might impact my pulmonary function. Very thorough, great mannner and clear answers to my questions.
Providence Patient
The Dr is a very caring concerning man. Cares how your really feeling and goes over and beyond to help with your over health besides your lungs.
Providence Patient
He is very caring and wants to find the cause of my symptoms.
Providence Patient
Just a follow up requested by the doctor was scheduled after more 6 (six weeks) by the staff at St Jude.
Providence Patient
He really cares and gives us all the help we need and understanding me as well.
Providence Patient
At Providence always had a very good experience with the doctors and staff I think you all are awesome thank you
Providence Patient
He is very good he knowns what I need what need & is very caring person .
Providence Patient
Always have good experiences.
Providence Patient
All was great except for the wait time
Providence Patient
Positive
Providence Patient
Dr. Weissig is an excellent doctor, he is caring, effective and I know I am in great hands under his care. His staff is excellent as well. Thank you so much Dr. Weissig!
Providence Patient
Dr. Weisig,M.D. Always takes the time evaluate all of my concerns and never dismisses my symptoms. He doesn't hesitate to make referal in areas outside his expertise whenever necessary.
Providence Patient
Dr. Weissig and his staff are competent, professional, friendly, and helpful. I just wish it was easier to get and appointment without waiting weeks or longer.
Providence Patient
Excellent care, listens and very detailed and concerned of one's health.
Providence Patient
I have been with Dr. Weissig since he started. He's the best.
Providence Patient
A very very good Doctor.
Providence Patient
All good
Providence Patient
I am extremely fortunate to have Dr. Weissig as my pulmonary doctor He gives me the best care possible.
Providence Patient
All the provider and receptionists are nice.
Providence Patient
Good
Providence Patient
Dr Weissig is the most through, caring, truely interested Doctor I have ever had at Providence or anywhere for that fact!! He notices things other doctors never notice even when that is what I am there to see them for. Example, cough, severe stomach ache, shortness of breath, pain, etc., etc. I feel totally safe and comfortable talking with him about anything! I would be so happy if I never had to see another Doctor, ever!
Providence Patient
Dr. Weissig has been my PCP for decades. He's the best!
Providence Patient
This doctor and team are fantastic
Providence Patient
I appreciate the outstanding care service received from this doctor and his staff.
Providence Patient
Excellent doctor who is caring and an expert in his area.
Providence Patient
Excellent Specialist
Providence Patient
Dr Weissig is the best doctor I've ever had. He listens and he cares. He took the time to go over my medical records, before beginning. He's amazing.
Providence Patient
I feel that Dr, Weissig listened carefully to my concerns and provided understandable answers to them. He explained what he felt were my conditions And to keep him abreast of any changes or future concerns that I may have.
Providence Patient
Dr Weisigg is very thorough, a good listener, and caring doctor.
Providence Patient
DR WEISSIG IS THE BEST
Providence Patient
Dr Weissig is a phenomenal doctor. He is very learned in regard to many health issues besides his specialty. I have been a patient of his for over 25 years
Providence Patient
Dr Weissig is an excellent provider. Unfortunately I had to wait 5 months to see him. I had Bronchitis in January 2024.which triggered an old asthma problem. I could not get an appointment to see Dr. Weissig until May 2024 - 5 months of waiting. I went to urgent care twice and to my PCP, neither of which was able tp do for me what I knew Dr. Weissig would be able to do. After I saw him and took the medication he recommended I was better quickly. He is very knowledgeable as well as kind and caring.
Providence Patient
Good esperiience
Providence Patient
This doctor seems to genuinely care about my health.
Providence Patient
Thank you for your help and care during our visit
Providence Patient
Satisfied
Providence Patient
Great dr. Easy to talk to and has great concerns for my health.
Providence Patient
Dr. Weissig is a very professional, well-skilled, extremely knowledgeable, expert in his field, very comprehensive, great patience, a great listener and wonderful bed-side manner. We love him.
Providence Patient
Dr Weisigg is extremely knowledgeable and explained my conditions so I could understand. He gave me positive feedback on the changes and progress I have been able to make. He also ordered further tests because I am struggling with my health. I would highly recommend him!
Providence Patient
Everything went well. No issues at this time.
Providence Patient
This provider thinks he's God. I'm very disappointed as to how he talks to me now. He demands that I live a certain way or he won't see me anymore. It's outrageous!
Providence Patient
Dr. Weissig and his staff are professiona, knowledgeablel and courteous at all times.
Providence Patient
Great experience
Providence Patient
He is very good, but this last one was very upsetting.
Providence Patient
Every body was professional, polite, efficient and responded very well to my questions.
Providence Patient
Vertical attentive, very knowledgeable, and very caring.
Providence Patient
Dr. Weissig always shows a genuine interest in my health which I really appreciate and don't always see from other providers.
Providence Patient
Excellent doctor answers. All questions asked very good person.
Providence Patient
Dr. Weissig always looks at the most recent lab results and is an active care partner.
Providence Patient
Always feel rushed.No available on short notice.No review of records prior to visit.
Providence Patient
The best
Providence Patient
Dr. Weissig makes me feel like I am his only patient.
Providence Patient
I have seen doctor wycing for probably over 20 years. If your facility and hospital had 200 more of doctors like Dr. Weissig you would be on a 10 star hospital and facility. There is no one like this exceptional Dr. & specialist.. [Name(s)]
Providence Patient
This provider is Always late, sometimes 1 hour
Providence Patient
He wasn't my regular doctor. But he was very nice and a really good doctor.
Providence Patient
Always excellent care from Dr Weissig
Providence Patient
Dr wiseg is very precious in revue the history of my case and the recomendations from the past and comparing It with the new status . Very respected and sharp In his timings can not find any one better than him the best plomenary Dr at the providence group.
Providence Patient
Dr. Weissig has been my primary care doctor for about 30 years. I trust him with all my healthcare issues. He's a brilliant and caring doctor, who knows and understands my fears and yet Is tough with me in a gentle manner. I will be gutted if and when he decides to retire. I'm so blessed to call him my doctor!
Providence Patient
Always extremely professional.
Providence Patient
Dr Weissig is very knowledgeable and competent in his area of expertise. He engages in personal touch . Listens and is very empathetic and compassionate. He has diagnostic skills and critical thinking .Dr Weissig delightful person and a dedicated doctor you feel you're in best hands possible.
Providence Patient
Dr. Weissig has been exceptional providing continuous care and encouragement through my lengthy battle with COPD & 4 cancers! Thanks!
Providence Patient
Dr. Weissig always listens, checks my chart, and answers all my questions. I always know he understands my issues and prescribes the proper medications!
Providence Patient
This provider truly cares about his patients the best lung Dr out there.
Providence Patient
Does a great job in all he does no problems to big.
Providence Patient
I feel that my doctor knows me and cares about me.
Providence Patient
Extremely nice doctor who takes time to deliver best care.
Providence Patient
I trust Dr Wesson and the decisions he makes regarding my health.
Providence Patient
Dr. Weissig heard my concern about a condition I was experiencing and prescribed a new medication to help. Much appreciate!
Providence Patient
Very satisfied with the care I wa given
Providence Patient
Dr WEISSIG is the best of the best . There are next to none physicians such as him. His passion for his calling is simply amazing . He loves what he does .
Providence Patient
Always listens and makes helpful suggestions and helps with Rx as needed
Providence Patient
Good
Providence Patient
Dr. Weissig is super. He's the best. In other areas, I have had less good feelings.
Providence Patient
Dr. Weissig is an amazing doctor who is willing to dig deep to help with medical issues.
Providence Patient
Consistently outstanding experiences with my provider.
Providence Patient
Dr Weissig has always been open with my care and offering referrals when needed. I feel he is very knowledgeable and easy to talk to. He is very respectful.
Providence Patient
I enjoy talking with this doctor.
Providence Patient
He is a professional and amazing doctor.
Providence Patient
My primary care physician is good Listen to you doc Arthritis he does not care for first time when saw me oh go for surgery or metastasis It was bad Instead give every month visit my devotion hand she gave every 3 months I have depression and with situation make me more depressed and unable to sleep
Providence Patient
Saw two members of this practice
Providence Patient
Dr. Weissig is probably the nicest and most caring doctor I have ever seen. More importantly he has excellent knowledge and has taken the time and care to thoroughly give me the care I need.....can't say enough good things about him.
Providence Patient
Dr Weissig always takes his time and is very thorough. Excellent every time.
Providence Patient
Dr. Weissig is very thorough and answers any questions I have. He is also proactive as opposed to reactive concerning my condition.
Providence Patient
Dr Weissig is a very good Dr!!!
Providence Patient
Dr. Wessig is one of the most knowledgeable, kind, compassionate physicians. He cares and goes above and beyond for his patients. Best doc ever!!
Providence Patient
Finally felt like I might have a better life than now
Providence Patient
Dr. Weisseg is very complete in his examination and explains thing well. The only negative was wait time was approximately 45 minutes. The doctor did appologize.
Providence Patient
The wait time of many months for an appt is distressing. The care received is very good. Dr. Weissig a great health care provider.
Providence Patient
Dr Weissig is so compassionate, knowledgeable and caring.Such an amazing asset to your organization!
Providence Patient
Dr Weissig is the best pulmonologist around. He has saved my life.
Providence Patient
Excellent care provider
Providence Patient
Dr Weissig is excellent on all levels, he shows me the results on the screen and explains what they mean. He's ordered lab work that was not done in previous order also repeating a breathing test that was done 1 year 9 months ago to see any changes.
Providence Patient
Dr Weissig has always been caring and takes time with you.
Providence Patient
Dr Weissig is a highly-knowledgeable doctor who has helped me with several problems. He is an excellent listener, and remembers my health history very well. I really appreciate Dr Weissig!
Providence Patient
The doctor is very professional and explains in details results, treatment and next steps.
Providence Patient
Love Dr. Wessig, he's the best.
Providence Patient
He ordered 5 blood tests for me. When I showed him the test results follow up appointment. He didn't explain to me any tests results, he said he doesn't know what they meant , refer me to see immunologists I have to wait another 3 months to get appointment to see the specialist. If Dr Weissig doesn't understand the meaning of those tests, why border to ask patients to take the flood tests. He didn't give me any treatment at all. Wasting my time and money.
Providence Patient
Dr. Weissig has always been concerned about my overall health, not just pulmonary issues, and has therefor been able to identify, assess and ultimately get treatment for other important health concerns!! This is very appreciated in a day and age where getting a doctor to even see you in person, much less treat a critical condition, takes months and months, leaving the patient feeling helpless and uncared for!!
Providence Patient
Very thorough, sensible game plan for my health concern
Providence Patient
Very professional
Providence Patient
All good. Doctor went over my numbers, the numbers from my machine, talked about what good looks like and asked for any questions I might have.
Providence Patient
Always good with Dr Weissig
Providence Patient
Dr. Weissig has always taken time to over my pulmonary functions. He is very knowledgeable and has referred me to infectious disease consultant Dr.Trotter.
Providence Patient
After checking in with blood pressure and weight I waited 35 minutes to see the doctor.
Providence Patient
Dr.weisig ***** 6 stars
Providence Patient
Dr Weissig is thorough & attentive. When I first started with Dr Weissig, he saw that some things were not being attended to and he took control. I've since changed my primary care physician and now see Dr. Weissig for pulmonary only because I know he's crazy busy. I did not hear from him after the CT scan because the purpose of our appointment was to go over the scan. Dr Weissig has gone above and beyond to see to it that I'm now getting appropriate medical care. I really appreciate him and all that he's done for me.
Providence Patient
Dr. Weissig is a wonderful and caring doctor. In my case, he went out of his way to make sure that I got to the emergency room immediately. He personally took me in a wheelchair to the ER. I will be thankful forever. An AMAZING doctor!!!!
Providence Patient
Excellent
Providence Patient
The provider concluded and communicated that there was no further need for follow up. I appreciate it and not have to make unnecessary visits.
Providence Patient
Always have good experiences.
Providence Patient
Dr Weissig is the best!
Providence Patient
All experiences are good. Very happy with all of my medical providers.
Providence Patient
I have never had a bad experience with the care I have received from Dr. Weisig.
Providence Patient
I have never had a bad experience with my doctor, he has always taken the time help figure out what the next step is. I would definitely recommend him
Providence Patient
I have all praises for Dr. Weisseg. He is very knowledgeable, he really cares about me.
Providence Patient
Best dr I've ever had.
Providence Patient
Dr. Weissig is a very thorough, knowledgeable physician. He has been my go to physician for over 30 years. He is a proactive provider who is undoubtedly the reason I am able to manage a number of health issues and live a very active life in spite of being almost 84.
Providence Patient
I've been going to Dr weissig since 1998. He has always taken time to listen to my concerns. What I appreciate the most Is that he's always up to date on the newest medications & the most recent medical studies. He is very knowledgeable about what's happening with my condition. Also whenever I message him on my chart with a question or need, he always answers right away. What I don't like, is that it's impossible to get an appointment when I'm sick & in need of a visit. He is always booked up for any immediate appointment. Other than that I have only praise for his years of care.
Providence Patient
I believe the doctors at St. Jude's are wonderfully caring and I've never had a bad experience with any of my providers.
Providence Patient
Dr Weissig is always very helpful & answers all of my questions
Providence Patient
Dr Weisigg is a doctor who is in a class by himself. He possesses a wealth of knowledge, and experience that is not often found these days. He is patient, engaging, and an extremely good listener in addition to his high level of competence. My husband came with me and we both commented on the rarity of doctors in Dr W's league. My only regret is that my issue has cleared and I no longer need to see him :) Dr W is as good as they come.
Providence Patient
Excellent doctor!!
Providence Patient
I saw Dr. Weissig several times before and I feel so blessed to have him as my Lung Doctor. Dr. Weissig explained the information on my test clearly, he listened to my questions and answered me the way I could understand. Dr. Weissig is so patient and kind, he really cares about helping me to get better. Thank you, Dr. Weissig.
Providence Patient
Always excellent!
Providence Patient
Very knowledgeable, very attentive, and sensitive to my needs.
Providence Patient
Dr. Weissig ordered a breathing test, and the operator was extremely pleasant and professional.
Providence Patient
Clinical Interests
- Airway Disorders
- Airway Obstruction
- Airway Scarring
- Allergic Aspergillosis
- Allergic Pneumonitis
- Allergic Wheezing
- Alpha 1 Antitrypsin Deficiency
- Asbestos Lung
- Aspiration Pneumonitis
- Asthma
- Atelectasis
- Autoimmune Pleuritis
- Bilevel Positive Airway Pressure
- Bronchiectasis
- Bronchiolitis Obliterans Organizing Pneumonia
- Bronchitis
- Bronchoscopy
- Bronchospasm
- Chronic Cough
- Chronic Lung Disease
- Chronic Obstructive Pulmonary Disease
- Chronic Respiratory Failure
- Continuous Positive Airway Pressure
- Diaphragmatic Disorders
- Drug Induced Pulmonary Disease
- Dyspnea On Exertion
- Emphysema
- Empyema
- Exercise Intolerance
- Hemoptysis
- Hepatic Hydrothorax
- Home Sleep Study
- Hypercarbia
- Hypoventilation Syndrome
- Hypoxia
- Interstitial Lung Disease
- Laryngotracheitis
- Lung Abscess
- Lung Cancer Screening
- Lung Disease
- Lung Infiltrate
- Lung Mass
- Maternal Respiratory Disease
- Mechanical Ventilation
- Occupational Lung Injury
- Occupational Respiratory Disease
- Pertussis
- Pleural Diseases
- Pleural Effusion
- Pleural Fibrosis
- Pleural Thickening
- Pleural Tuberculosis
- Pleurisy
- Pleuritic Pain
- Pneumoconiosis
- Pneumonia
- Pneumonitis
- Post Infectious Cough
- Pulmonary Arterial Hypertension
- Pulmonary Bullae
- Pulmonary Clearance For Surgery
- Pulmonary Complications Of Neurological Diseases
- Pulmonary Embolism
- Pulmonary Fibrosis
- Pulmonary Function Tests
- Pulmonary Granuloma
- Pulmonary Hypertension
- Pulmonary Infections
- Pulmonary Nodule
- Pulmonary Rehabilitation
- Pulmonary Sarcoidosis
- Pulmonary Stent Placement
- Pulmonary Therapy
- Radiation Pneumonitis
- Reactive Airway Disease
- Recurrent Lung Infections
- Restrictive Lung Disease
- Rheumatoid Lung
- Rigid Bronchoscopy
- Sarcoidosis
- Shortness Of Breath (Sob)
- Silicosis
- Sleep Disorders
- Smoker Cough
- Spirometry
- Stridor
- Thoracentesis
- Tobacco Related Diseases
- Tracheal Mass
- Tracheal Stenosis
- Tracheobronchitis
- Tuberculosis (Tb)
- Ventilator Management
- Virtual Care
- Wheezing
Love Dr Wessig and I am glad he is back and feeling better. I want him to take care of himself.
Providence Patient