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
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.
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
All good
Providence Patient
Dr. Ling is an excellent endocrinologist and would strongly recommend him
Providence Patient
Dr. Ling has answered my questions, explained my conditions and concerns, and is knowledgeable about my MS condition. I never have felt being rushed through any of my (video) appointments with him. He is positive and supportive. I am very pleased with my care under him.
Providence Patient
Great Doctor and I usually do t say that about doctors.
Providence Patient
I'm pleased with my care provider for answering my questions and concerns in a way I can understand.
Providence Patient
My provider is always open to my concerns and takes the time to explain treatment options and potential side effects. His office is always professional and courteous.
Providence Patient
Dr. Ling and his staff are great. I felt heard, and my care was outstanding.
Providence Patient
I always look forward to talking to my provider. We always go over my Lab Test and he let's me know if I need to adjust my Medications to correct a problem that he see's on my Lab words. It gives me comfort to see these adjustment, that my provider has given me, that I am getting good results and that I am going in the right direction.
Providence Patient
Dr ling is always attentive to my medical needs and addresses any new recommendations.
Providence Patient
Good
Providence Patient
Overall I enjoyed the ease of calling to setup an appointment. Another helpful experience Is my doctor answered my questions and Informed me more than what I knew.
Providence Patient
Dr Ling is always well prepared and responsive. He's an excellent physician who clearly cares about his patients and makes recommendations which are well received.
Providence Patient
The Dr was great
Providence Patient
Dr. Jason Ling is a wonderful Endocrinologist. I appreciate his attention to my diabetic care. I feel comfortable talking to him about any of my health concerns. I have already recommended him to many of my friends.
Providence Patient
Always a great experience with Dr Ling and staff
Providence Patient
Dr Ling is very thorough in my plan of care regarding type 2 diabetes.
Providence Patient
I felt that I was receiving the best advice/medication for my condition. My test result showed an amazing improvement in my health and wellness.
Providence Patient
Very good follow up.
Providence Patient
Dr Ling is an excellent provider. He takes time to listen to my concerns and gives excellent care.
Providence Patient
Dr. Ling has been very helpful with my medical condition when other endocrinologists were not. Thank you!
Providence Patient
Doctor is knowledgeable, willing to listen and friendly.
Providence Patient
Very happy with the video visit and care management.
Providence Patient
Dr.jason is a very good person. Has a very good experience, treat his pt in a very knowledgeable and respectful nice way.
Providence Patient
Love Dr Ling .
Providence Patient
Before my appointment Dr Ling reviewed my records and was aware of new cancer treatments I'm receiving.
Providence Patient
Dr Ling always listens to me and answers my questions. I highly respect him.
Providence Patient
He's a credit to your team!!!!!
Providence Patient
Dr. Ling and his staff are very professional, compassionate and helpful.
Providence Patient
I'm happy with my doctors thank you For take care of me
Providence Patient
I appreciate the fact that when I visit this Doctor, he spends ample time with me, shows concern regarding my health, gives clear explanations as to why he is doing or making changes to my treatment and fully answers my concerns or questions.
Providence Patient
Very satisfying
Providence Patient
Very professional he show concern.
Providence Patient
Can't complain about anything.
Providence Patient
Dr.Ling is the best, he is extremely helpful and he really listens well. It is rare that you have a provider that really gives you time to talk this install. Your concerns with Dr. Ling is definitely one of them. My last visit I was actually the one late but he patiently waited for me and kept calling me until he was able to speak to me. Thank you Dr. Ling for being the kind of doctor that you are.
Providence Patient
No complaints.
Providence Patient
Always caring and concerned.
Providence Patient
I asked questions he could not answer. Referred me to my primary care physician. I felt he dismissed my concerns.
Providence Patient
Total professional
Providence Patient
Dr Ling is an excellent physician. He listens and answers questions with care and concern. He provides information in an understandable manner and takes the time to explain things. He gives you his full attention and does not rush. You feel that you have his full attention and focus during your visit. I am very pleased with the service he provided
Providence Patient
I liked the way Dr Ling takes care of his patients.
Providence Patient
I find Dr Ling to be thorough, professional, personable, and attentive to my questions and needs.
Providence Patient
Dr.Ling is a great Doctor.
Providence Patient
I am happy and pleased to receive medical care from Dr. Ling.
Providence Patient
A very good Doctor.Young, but very good.
Providence Patient
Normally everything's are good abd as expected. Loved Dr. Ling. Very courteous doctor .
Providence Patient
My physician was very thorough, professional, and easy to understand . He was very concerned on the meds I was taking.
Providence Patient
Dr. Ling is outstanding.
Providence Patient
I've always had a good experience. I've never felt rushed and I feel like Dr. Ling is keeping me in good health.
Providence Patient
Dr Ling is an excellent specialist! Listens intently and is very thorough! Very pleased!
Providence Patient
I felt comfortable to see him.
Providence Patient
Dr. Ling represents the best in medicine! He is easy to talk to and listens to my concerns and/or questions. His answers are easy to understand and is a good communicator.
Providence Patient
Excellent care
Providence Patient
Dr. Ling is very thorough and easy to talk to. His explanations as to what my body is doing were very clear. Thank you.
Providence Patient
For the first time, a doctor has openly said he's working towards getting me OFF of the medications I've been taking for years. I finally feel I have a doctor that has MY best interest in mind to help FIX my condition vs continuous medications with no end in sight.
Providence Patient
It was very helpfull and good experiences with our discussions with Dr. J. Lin.
Providence Patient
He is a very caring man
Providence Patient
Dr. Ling was a new doctor me, since my most recent doctor left the practice. Dr. Ling took the time to learn who I was and all my medical concerns. He answered all my questions and I feel confident with him as my doctor moving forward, hopefully for many years ahead.
Providence Patient
Good
Providence Patient
He explained my health very clearly. He explained things to me with a graph which I can understand more.
Providence Patient
Very professional care
Providence Patient
He is very good
Providence Patient
Good answer when I ask something about my health.
Providence Patient
Dr. Ling is my diabetes Dr. He has a very good relationship with me and I presume with all of his patients.
Providence Patient
Dr.Ling remembers small details. I don't like that I have to see him, but since I have this condition I couldn't have a better specialist.
Providence Patient
Dr Ling was impressive I feel was treated well ! He is knowledgeable and treated me very responsibly & completely !
Providence Patient
Good attitude, on time
Providence Patient
Dr Ling was wonderful knowledgeable caring looked over my chart & issues beforehand listened attentively & addressed my questions. This was my first consultation with Dr Ling & I was really impressed with his knowledge & helpfulness in this area. I will follow his recommendations & be back to see him as he scheduled. Thanks Dr Ling for all your assistance & advice
Providence Patient
I'm feeling great, the care is exceptional
Providence Patient
He registered concern regarding a medication I have been prescribed by another doctor.
Providence Patient
All good and for that I am most grateful.
Providence Patient
I was satisfied with this appointment.
Providence Patient
Dr. Ling is an excellent provider and very inclusive and thorough in meeting my care needs
Providence Patient
Dr. Ling was absolutely wonderful. He listened carefully to my questions and was very respectful .I'm very happy with the overall experience with Dr. Ling.
Providence Patient
Dr. Ling is an exceptional physician. He listens and he cares.
Providence Patient
Very good
Providence Patient
Dr. Ling and his staff have been very helpful and have helped me with prescriptions that were being delayed and they helped me expedite my Dexcom to me when I informed them I had been waiting for [ID] few months. So they helped me right away with calls
Providence Patient
I found Dr Ling to be very professional and Knowledgeable of my condition.
Providence Patient
Very happy with Dr Ling.
Providence Patient
The office staff is pleasant and efficient. Dr. Ling is very easy to talk to.
Providence Patient
Doctor Ling is a very nice person and he does his job very well. He always listens and recommends the best medicines to follow a treatment. My husband and I are very pleased to have Doctor Ling, he is very professional.
Providence Patient
DR Ling is greatAlways look forward to seeing himHe is an exceptional provider
Providence Patient
I'm happy with services rendered at St. Jude's. Gracias!
Providence Patient
Again as my son's caretaker I'm very pleased with our experience with Dr. Ling.
Providence Patient
Good
Providence Patient
Very satisfied with Dr. Ling and his staff for the professionalism in caring for my medical needs.
Providence Patient
Dr.Ling is incredible and the office staff and helpful and kind. I love it here.
Providence Patient
Excellent staff and physician
Providence Patient
He is very good
Providence Patient
It was ok
Providence Patient
Dr. Ling is Awesome. He listens to everything I say with care and respect. Does not judge me. I am very comfortable with him. Thank you Dr. Ling
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
Very good
Providence Patient