Jason S. Ling, 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 - Endocrinology
100 East Valencia Mesa Drive, Suite 105, Fullerton, CA 92835
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About Jason S. Ling
Dr. Jason Ling is a board-certified Endocrinology Specialist based in Fullerton, California. He is also board-certified in Obesity Medicine, Clinical Lipidology, and Certified Clinical Densitometry by the International Society for Clinical Densitometry.
Serving as the physician site director of St. Jude's Endocrinology group, he plays a role in overseeing and leading the endocrinology team. Additionally, Dr. Ling serves as the co-medical director of the Bone Health Program at St. Jude, where his goals are to prevent reoccurring fractures.
Stony Brook University School of Medicine
2016
Hofstra Northwell School of Medicine
2018
St. George's University School of Medicine
2013
Stony Brook University
2014
- American Board of Internal Medicine, Internal Medicine
- American Board of Internal Medicine, Endocrinology Diabetes and Metabolism
- American Board of Internal Medicine Internal Medicine, Internal Medicine
100 East Valencia Mesa Drive, Suite 105
Fullerton, CA 92835
Providence St. Jude Medical Center
Community Reviews
At Providence, we're dedicated to providing you quality, personalized health care. We are constantly striving to optimize your experience.
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.
Easy to talk to and very knowledgeable doctor.
Providence Patient
Dr. Ling is an excellent care provider. He listens to my concerns and explains thoroughly.
Providence Patient
Dr Ling and his team are great to have as my provider
Providence Patient
It's all positive
Providence Patient
Dr. Ling is a caring doctor and thorough. He explains everything very clearly.
Providence Patient
Dr Ling is awesome
Providence Patient
Dr. Lung made some modifications to my healthcare program, and thus far have been very effective.
Providence Patient
The doctor provided good information. He was clear and Informative
Providence Patient
Happy with the care received.
Providence Patient
Caring
Providence Patient
Dr. Ling is a Great Doctor! He is very informative, friendly, and explains things to where I can understand. Answers my questions and has truly been one of the best doctor's I've had in years! As a patient I'm glad I found him and have him as my specialist! The staff at Dr. Ling's office is also very friendly and helpful. It is always a pleasant experience when calling in to schedule or if I have questions.
Providence Patient
Dr. Ling is n excellent specialist. Would very highly recommend him.
Providence Patient
My experiences with Dr Ling have been excellent he has made me feel like a very important patient I'm very blessed to have him as my Dr
Providence Patient
Everything good
Providence Patient
Dr Ling and his staff provided excellent service in a friendly and courteous manner. I have always had a good experience with this office.
Providence Patient
I wasn't seen within 15 minutes of appointment time because I arrived late. The office staff are great and so is The Doctor!
Providence Patient
Competent, respectful and communicative.
Providence Patient
Dr Ling is a very caring physician. He is always on time with his appointments and explains lab results thoroughly!
Providence Patient
I am satisfied, my appointments and referrals a have been within the time allocated, although some were a bit far into the scheduling. It would be nice if our doctors would be better trained at functional medicine, preventative than only symptomatic. There are a lot of things nutritionally that patients can do to alleviate and correct illness besides medicine
Providence Patient
He is a good doctor and I like the whole team too.
Providence Patient
Dr. Ling has always been patient and listened to my concerns, and has offered options for treatment issues. Whenever I had an issue between appointments, I corresponded via My Chart, and he replied within 24 hrs. Very knowledgeable and patient.
Providence Patient
A very very good Doctor.
Providence Patient
Dr Ling was a breath of fresh air, took his time to explain things and was very knowledgeable of my personal medical history.
Providence Patient
Good patient/doctor relationship
Providence Patient
Dr. Ling said we would see me in 6 months, but I was scheduled eight months out, due to his schedule being full.
Providence Patient
Dr Ling is very personable, easy to talk with and zeroes in on the issues. I don't need to see him until next year. Labs and procedure were generally good. I have confidence in Dr Ling's medical understanding of my needs.
Providence Patient
The doctor and staff were "on top" professionals!
Providence Patient
I like Dr Ling very much. I wish I could see my Doctor and not the nurse practitioner.
Providence Patient
Dr Ling is amazing with special needs patients
Providence Patient
Appointments are not easy to come by. All else is good
Providence Patient
Very good visit
Providence Patient
Dr. Ling explained the results of my cholesterol test results which showed Improvement after taking meds I appreciate his taking good care of me. Thank you.
Providence Patient
Good experience
Providence Patient
They are patient with me all the time.
Providence Patient
Met all my needs and is taking excellent care of my medical needs
Providence Patient
Dr. Ling is an excellent provider and is always very thorough in providing care. He is the best.
Providence Patient
I am very satisfied with the care I receive from this provider. The only reason that I didn't rate this provider a "10" that I would recommend this provider is only due to the fact that I rarely recommend providers to anyone,
Providence Patient
Dr. LIng listened! He clarified his answers to my questions! I would definitely recommend him and his staff!
Providence Patient
Dr Ling gets my highest recommendation. He is professional, caring and has treated me with respect and compassion. His staff promptly follows through with his medical direction.
Providence Patient
Dr. Jason Ling is very knowledgeable and careful. He has a very good bedside manner and take care of the patient whole heartedly. He always listen very carefully what the patient has to say and then explained patiently until patient understand. I think Providence should have more physicians like Dr. Jason Ling.
Providence Patient
I felt very comfortable, secure and thankful to have a doctor like Dr. Jason Ling. For me he is the best.
Providence Patient
I really like this provider and group. The downside is that it takes a long time to get an appointment.
Providence Patient
Excellent doctor Thanks
Providence Patient
Good follow up
Providence Patient
Easy to talk to
Providence Patient
It is near impossible to get correct information. Told preauth was sent and found out it wasn't.
Providence Patient
They were fabulous thank you
Providence Patient
Dr. Ling is very caring and professional..
Providence Patient
Dr Ling is very knowledgeable and always professional doesn't rush through my appointment offers option and seems to care more than others . I would recommend him and have recommended him
Providence Patient
Good
Providence Patient
All visits very satisfying.
Providence Patient
Dr Ling always shows genuine concern for what is going on with you.
Providence Patient
Good Doctor, very professional
Providence Patient
Dr Ling a is a caring and wonderful specialist!
Providence Patient
Very good
Providence Patient
I appreciate the ease in contacting Dr.Ling's office. If I have a question, I can call directly into his office and reach his assistant. His office has no "barriers' with communication. No call centers or outside interference.
Providence Patient
Dr. Ling is the best! He is very friendly and knowledgeable. He has helped me make good changes in the care of my chronic illness.
Providence Patient
Dr Ling is very knowledgeable in his specialty, takes time to explain things and answer my questions and is an excellent Endocrinologist!
Providence Patient
Fantastic provider! THANKFUL for the excellent care.
Providence Patient
Dr. Ling is very personable and explains things very clearly. After my appointment, I always feel that I've learned something new about my body and how it functions. I appreciate that.
Providence Patient
Very patient, listens carefully to all my concerns. Very comfortable with him.
Providence Patient
The best Doctor
Providence Patient
Dr. Jason ling is one of the best Endocrinologist at St. Jude Heritage Medical group. He takes an interest in your case. He stays on top of your labsFollows through and has a great personality and outstanding communication skills. I highly recommend Dr. Ling
Providence Patient
So far everything is good for me.
Providence Patient
I enjoy discussing my lab results, good or bad with Dr. Ling. He keeps me on schedule for tests I should be getting.
Providence Patient
Dr. Jason Ling is a good caring and professional provider, and I feel fortunate to have him as my doctor.
Providence Patient
He was very pleasant easy-going didn't talk over my head. I am understood him. I like the way he explained everything
Providence Patient
Dr.Ling listens well to the patient. He is knowledgeable and caring. He is a top notch physician!
Providence Patient
I enjoy speaking with my Doctor. He is very attentive to what I tell him and very respectful of my concerns and opinions. He is a joy to visit.
Providence Patient
Always a good visit
Providence Patient
Dr. Ling is very professional and able to recommend better medication for me to try. Thank him so much.
Providence Patient
THE BEST PROVIDER IN TOWN!!!
Providence Patient
Very satisfied
Providence Patient
Thank you. I have a great appreciation for all the doctors, and staff at St. Jude. The level of care has been accessional. Dr. Batty, Dr. Ling and Dr. Gazzaniga and all the staff have be great. Thank you. Mr.[Name(s)]
Providence Patient
Dr Ling is fantastic. Very easy to talk, very professional and knowledgeable.
Providence Patient
First time video callWas a good experience
Providence Patient
Listens carefully and thoughtfully.
Providence Patient
Dr. Ling is very good at listening to my concerns and has helpful information regarding my health.
Providence Patient
All good
Providence Patient
Dr. Ling is an outstanding endocrinologist. I always leave his office knowing my health is in good hands.
Providence Patient
Dr Ling and his staff always treat me with respect and kindness. Dr. Ling is extremely knowledgeable and thorough during my visits and my health is his utmost priority and concern.
Providence Patient
Dr. Ling is a very good doctor
Providence Patient
Would have like to have has more information on resources for this new health experience in terms of self management
Providence Patient
Dr Ling is very knowledgeable, patient and professional with his treatment for me as well his entire team.
Providence Patient
Dr Ling is amazing and the visit was great he is thoughtful and has a great bedside manner. I wish he was not booked up so far in advance.
Providence Patient
Good doctor, good service
Providence Patient
Dr. Jason Ling; very good!!
Providence Patient
Appointment are 5mths in the future and I really appreciate the lab in the plaza I pray it does not close
Providence Patient
All good.
Providence Patient
Dr Lang makes me feel like I'm his only patient when I'm with him it's very comforting and reassuring.
Providence Patient
So happy with Dr. Ling. So happy he's my Dr. Very pleasant to talk to him. Explains my thyroid medicine, how it works. Goes through all my blood work step by step. Great Dr.
Providence Patient
He is very professional and knowledgeable when it comes to my medical needs
Providence Patient
Everything about this medical facility, and Dr. Ling is fantastic! I received excellent care, Was listening to, and well respected!
Providence Patient
Down to earth doctor and knows his stuff!
Providence Patient
Dr. Jason Ling is worth the wait!
Providence Patient
Dr Ling does an excellent job. He takes the time to listen to you, he is thorough and knowledgeable and able to explain things in an understandable manner. He's an excellent physician.
Providence Patient
Dr Ling is very good at explaining the approach to managing my health.
Providence Patient
Dr Ling is always on top of my test results, and has suggestions on how to maintain or improve my results.
Providence Patient
Dr.Ling is always thorough in reviewing my most recent lab work and compares results to past lab for any change in trends.
Providence Patient
I find him very Knowledgeable about my medical condition and very professional when I ask questions about my condition.
Providence Patient
I feel very good as he told me what I will take care myself,such as food and exercise .
Providence Patient
Excellent doctor
Providence Patient
Dr. LING is a wonderful, caring, compassionate doctor who listens to his patients!
Providence Patient
I feel completely confident with this provider because he listens and answers all my questions, spends time reviewing my condition and discussing them and clearly communicates things to me.
Providence Patient
All good
Providence Patient
Dr Ling has been very helpful!!
Providence Patient
Excellent experience Thanks
Providence Patient
Very friendly, listened and had a concrete plan moving forward.
Providence Patient
When I speak with my doctor, I feel he is really listening and understands what I feel and what I am concerned about.
Providence Patient
Always professional
Providence Patient
Didn't seem he was prepared for my appointment. I was requested to get blood work a week prior. He didn't seem to review the results that have worsened. I had to point it out and show him. Seems like he wasn't trying to come up with any solutions and asking me what I thought. I'm not a Doctor. Not sure if he knows what he is doing. I'm stuck, because it takes months to get an appointment with an Endocrinologist. His demeanor is pleasant, but I need a Doctor that can come up with solutions.
Providence Patient
All good
Providence Patient
Dr. Ling has become my second primary physician. He is in charge of my diabetes 2, high blood pressure, cholesterol, and thyroid functions.
Providence Patient
Very good experience.
Providence Patient
Dr Ling is highly knowledgeable, communicates well, offers expert advice, is professionally genuine & has his patient's best interest at heart. I'm blessed he's my Endocrinologist. Thank you Dr. Ling
Providence Patient
Pleased with care and services provided
Providence Patient
Grateful and appreciate medical care received
Providence Patient
I'm very pleased and impressed by Dr. Ling and his staff.
Providence Patient
Professional and doctor/patient relationship
Providence Patient
Dr Ling has an easy professional manner and easy to speak too.
Providence Patient
Dr ling is a great listener and addresses any concerns I would have immediately.Spends time with you to explains all concerns thoroughly.A very good Doctor to have.
Providence Patient
Dr Ling and staff are my diabetic care team; great treatment
Providence Patient
Excellent service always
Providence Patient
Timely and professional
Providence Patient
Office staff is very pleasant and helpful. Dr. Ling is professional and very caring. He is determined to identify why I develop kidney stones.
Providence Patient
Good
Providence Patient
Dr Jason Ling is one of the best doctor. He listen to you, take his time and gives you correct advice. He is very knowledgeable and expert in his field
Providence Patient
Very happy with Dr. Ling
Providence Patient
My experience with Dr Ling was was very successful and we made an agreement to work on my diabetes and that's what we're doing right now. I would probably recommend to anyone who needed a good endocrinologist.
Providence Patient
Dr Ling was very prepared and informative during the consultation. Only area for improvement would be it took almost 6 months to get an appointment as a new patient.
Providence Patient
Dr Jason Ling is an excellent specialist, is thorough, listens and has a great bedside manner! Extremely knowledgeable in his field and explains in layman's terms which is helpful!
Providence Patient
Dr Ling is the best! He is very friendly and smart. He provides great patient care. Thanks Dr Ling!
Providence Patient
Good doctor, good service
Providence Patient
Excellent experience
Providence Patient
He listened well and explained in detail consequences of continuing a medication which had been deleted by my gynecologist.
Providence Patient
Dr. Ling is very thorough and explains things very well.
Providence Patient
The virtual and in person Appointments are 3-4 months out due to high volume. Dr Ling is amazing and always professional
Providence Patient
Great team! Professional, caring, and the way things should always be!
Providence Patient
This provider has a great personality and professional demeanor.
Providence Patient
I have consistently been disappointed in Dr Jason Ling as a health provider. He can be great and kind if you don't have any health needsbut he seems to neither be very knowledgeable or capable, nor available or caring, if and when you really need him. I really wonder what good he does. He would rather have his patients' other doctors do his work for hiim. His lack of concern and care for his patients is almost murderous and he seems to not care less! I am really sorry for such a negative review. I could be much more specificbut I am afraid of him hurting me more until I am safely established elsewhere.
Providence Patient
It took the doctor and/or office staff six weeks to put insulin. Prescription in correctly and they still never put all the needed equipment order in. Very poor service.
Providence Patient
Good care
Providence Patient
Dr. Jason is very good to patient like me.
Providence Patient
Dr. Ling is by far my favorite physician at St.Jude. He is always attentive to anything I say and responds with easy to understand feedback.
Providence Patient
Dr. Ling is caring and is very good Doctor.
Providence Patient
Dr. Ling was so nice and very thorough about explaining everything to me. I really like Dr. Ling and would recommend him to my family and friends
Providence Patient
Dr. Ling provides easy to understand answers to my questions. He is very thorough in his explanations.
Providence Patient
Dr. Ling asks me about all aspects of my health, including mental health, that I appreciate very much. He has a calm demeanor and always asks me if I have any questions.
Providence Patient
Doctor Ling, and Dr. Otis have both provided excellent care.
Providence Patient
Clinical Interests
- Abnormal Cortisol Level Tests
- Abnormal Glucose
- Abnormal Glucose Metabolism
- Addison's Disease
- Adrenal Adenoma
- Adrenal Disorders
- Adrenal Mass Non Malignant
- Adrenal Neoplasm
- Adrenogenital Syndrome
- Androgen Excess
- Androgen Insensitivity
- Calcium Metabolism
- Carcinoid Syndrome
- Congenital Hypothyroidism
- Conn Syndrome
- Cushing Syndrome
- Diabetes Education
- Diabetes Mellitus
- Ectopic Hyperparathyroidism
- Endocrine Disorders
- Feminizing Syndrome
- Fine Needle Aspiration Of Thyroid
- Glucagonoma
- Glucocorticoid Deficiency
- Goiter
- Grave's Disease
- Growth Disorders
- Growth Hormone Abnormalities
- Growth Hormone Deficiency
- Gynecomastia
- Hashimoto Thyroiditis
- Hyperaldosteronism
- Hypercalcemia
- Hypercholesterolemia
- Hyperglycemia
- Hyperglycemic Hyperosmolar Syndrome
- Hyperparathyroidism
- Hyperthyroidism
- Hypocalcemia
- Hypoglycemia
- Hypogonadism
- Hypoparathyroidism
- Hypopituitarism
- Hypothalamic Pituitary Disorder
- Hypothyroidism
- Insulin Pump
- Insulin Resistance
- Insulin Therapy
- Insulinoma
- Low Blood Sugar
- Metabolic Bone Diseases
- Metabolic Syndrome
- Multiple Endocrine Neoplasia
- Myxedema
- Nodular Goiter
- Non Toxic Goiter
- Osteopenia
- Osteoporosis
- Panhypopituitarism
- Parathyroid Disease
- Parathyroid Hyperplasia
- Pheochromocytoma
- Pituitary Adenoma
- Pituitary Disorders
- Pituitary Tumor
- Primary Hyperparathyroidism
- Pseudohermaphroditism
- Pseudohypoparathyroidism
- Radioiodine Therapy
- Rickets
- Secondary Hyperaldosteronism
- Thyroid Cyst
- Thyroid Disorder
- Thyroid Hormone Resistance
- Thyroid Nodule
- Thyroiditis
- Thyrotoxic Exophthalmos
- Thyrotoxicosis
- Toxic Diffuse Goiter
- Toxic Nodular Goiter
- Type 1 Diabetes
- Type 2 Diabetes
- Uremic Hyperparathyroidism
- Virtual Care
- Vitamin Deficiency
First time visit with Dr Ling as previous doctor left. Very impressed with Dr Ling on first visit.
Providence Patient