Professional Summary

Education & Certifications
  • Board Certification: American Board of Family Medicine, Family Medicine (1982)
  • Residency: North Carolina Baptist Hospital (1982) NC
  • Internship: NCarolina Baptist Hospital (1980)
  • Medical Education: State University of New York (1979) NY


Practice Locations

Stanford Primary Care in Portola Valley Portola Valley, CA
Portola Valley, CA

3250 Alpine Road

Portola Valley , CA 94028

(650) 498-9000

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Patient Ratings

(212 Ratings)

Overall Rating

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Friendliness/courtesy of the care provider
Explanations the care provider gave you about your problem or condition
Concern the care provider showed for your questions or worries
Care provider's efforts to include you in decisions about your care
Care provider's efforts to include you in decisions about your treatment
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Likelihood of your recommending this care provider to others
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Wait time at clinic (from arriving to leaving)

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The Patients Ratings and comments are gathered from our Patient Satisfaction Survey and displayed in their entirety.

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Patient Reviews

(268 reviews)

Very thorough awesome
Always helpful and kind
He is very kind and pays attention to detail. He aske various & many questions and made a sound judgement.
Always come away feeling more optimistic about getting whatever ails me to improve
He is a wonderful doctor, very knowledgable and thoughtful. He also has an excellent bedside manner and carefully listens to patients and answers questions.
He is very good at explaining my conditions and the expected interactions with new medications. He's also very good at providing solutions to funding and availability of needed resources.
Jay has been my doc for 40 yrs. he's my go to doc for everything.
John Jernick is the best doctor ever!
Great doctor. Great assessment and rec. Would go back to him in a heartbeat.
Dr. Jernick is amazing and we appreciate him very much. My brother has Down Syndrome and doesn’t trust many people. He looks forward to seeing Dr. Jernick and team
Dr. Johh Jernick is a good communicator, organize, good listener, practice of good medicine, recovery-oriented and shared decision-making, and as person too. Thank you!
He’s the best!
Dr. is very experienced and a good listener.
Awesome doctor . Dr. Jernick encourage me to make healthier choices. His kindness healed me just as well as the treatment plan. His dedication and compassion are greatly appreciated. THANK YOU, Dr. Jernick!
Dr Jernick is an exception primary care provider. He is always approachable and works with me as the patient.
Dr. John Jernick is one of the best doctors in the world. He's been caring for my family over 20 years at Stanford. He's been helping us get healthier every day. We're always grateful for his care.
Dr. Jernick was very helpful, as always.
Hes awesome
As usual, he takes the time to listen to me and was very helpful.
Dr. Jernick is an excellent physician.
Simply the best.
He is very attentive and listens Have seen him since 1993
Great doctor, answered all my questions, was very thorough and helpful.
Very good visit w Jay. Many questions answered
Great service and focus on the patient.
The visit went well. My health concern was addressed.
Dr. Jernick is great - informative, straightforward, thorough, thoughtful, experienced and empathetic.
Easy going and straight forward advice
Execptional doctor and staff. Extremely professional and competant and caring.
Dr. Jernick was awesome as always!
Dr. Jernick described the results of the tests and what they meant, outlined possible treatments with pros and cons, and answered all our questions (my wife was also sitting in) thoroughly. As usual, his advice was sensible and level-headed. He will be sending me more information and I will get back to him on what I decide to do.
Dr. Jernick is the very best PCP I’ve ever had, just outstanding!
He is the best
Everything went well
Jay Jernick is terrific. I've been seeing him since he joinedStanford and he's always been thorough, attentive to what I say, and caring. Stanford is lucky.
My whole family is his patients last 33 years this shows how satisfied & love Dr Jernick. Dr’s usually not so sympathetic or has empathy for patient. Dr Jernick has all those qualities. God bless him & keep him healthy so we keep continuing to b his loyal patients.
Dr Jernick is fabulous
He is the tip doctor at Stanford. Would recommend him immensely.
Awesome services! Thank you!
Dr. Jernick is the most "perfect" doctor: amazing knowledge and intelligence, patience that is unbelievable, sincere caring that he shows, and someone with so many positive ways to proceed with your life.
dr jernick has been our family doctor for three decades -- and we are all grateful and ENTHUSIASTIC!
Dr. Jernick is a caring and excellent physician
I fully trust in the care and recommendations of Dr Jernick. He is one of the best in his specialty.
Dr Jernick is the best! Caring, competent, thorough
Dr Jernick is an excellent and caring primary care physician who makes his patients feel heard. I fully trust his medical care and advice.
Awesome doctor! Thank you!
Dr. Jernick is awesome!!
take time with to diagnosis.
Great care and doctor care and concern
Dr Jernick was patient, kind, and thorough. He treated me right there in his office, and got relief immediately.
Thoughtful and caring.
Dr.Jernick truly cares about his patients! I can tell that he had empathy. He can heal you not just physically but also emotionally.
Always more than satisfied with Dr. Jernick
Dr. Jernick has been a great addition to our Care Team. Indeed, we owe a lot gratitude to Dr. Jernick because we would not be able to get the results of good health without him.
I have been a pt. of Dr. Jernick's for many years. He is an excellent clinician and is up to date on all my various health needs, including all the other Stanford docs I see.
I know the Doctor does not need any new patients from me. He is terrific.
My brother loved his vidit.
As always, Dr. Jernick has been taking care of our medical needs for both me and my wife. He his always attentive and caring. He is always there when we needed him the most. Thank you Dr. Jernick!
Awesome services. Thank you! 😊
I am blessed to have one of the best doctors at one of the best hospitals.
great, very professional and informative
Dr. Jernick and his team are exceptional.
Dr Jernick and staff are excellent.
He is the best
wonderful as always
Always prepared, attentive to our needs, and very caring. We are fortunate to have a Dr. of his caliber.
Dr. Jernick has been very helpful. I appreciate it.
Stanford is a world class healthcare provider. Keep up the great work!
He is an excellent doctor.
Dr. Jernick is very attentive
Dr. John Jernick has good communication and "people" skills. He connects well with patients in person as well as with video. He takes the time necessary, listens well, as is able to shift and respond appropriately when a patient's deeper concerns and needs become clear.
Dr. J and Jose are wonderful. Actually receptionist was great too.
Dr Jernick is always considerate of my time and privacy and listens very well. I always appreciate his advice and care.
Dr. Jernick is the best!
Dr. John Jernick listens to me carefully and explain me the steps that need to be taken for my treatment. I am his patient for a long time.
Dr Jernick is by far the best doctor I have ever had.
Excellent visit
Dr. Jernick is the best primary care provider I have ever had (I am 72)
Dr.Jernick is the best!!!!
Excellent in every way.
DR. J is the best!
An excellent physician
Dr Jay is wonderful practitioner. He is understanding compassion wisdom and knowledge. He will take the time to talk to you.
Dr. Jernick is so amazing! I’ve been his patient for over 30 years and he has always diagnosed my conditions correctly and will always make time to see me within 24 hours.
Great bedside manner. Very knowledgeable and thorough.
Dr. Jernick has been my GP for over thirty years. He is very knowledgeable, thorough, and understanding, and always takes the time to make sure all my issues are dealt with. I would highly recommend him.
Dr. Jernick is an excellent Doctor. Thanks for your help and accommodations!
On time, efficient and thorough
Dr Jernick is hands down the best doctor I work with across all domains. He clearly cares and he speaks in a clear and concise manner that leaves you both informed and at ease.
Dr.Jernick is A Professional and A Value to HealthCare, He is compassionate and listens to you !I feel blessed to have Dr.Jernick in my life :-)
Dr. Jay is the best doctor. He really listens to me.
Always professional, patient, thorough and caring
Dr Jernick has always provided excellent care.
Dr. Jernick is the best
I've been treated by Dr. Jernick for over 40 years. There is no better physician, in my opinion..
Dr. Jernick is a wonder physician
Dr. Jernick listens well and explains things well. He is very personal in his approach.
An outstanding physician.
Excellent healthcare provider. I have been a customer since 1984.
Exemplary service and care from my longtime (33 years!) family physician, Jay Jernick MD. His staff seem to be personally picked by Dr. Jernick for their compassion and clinical abilities. It is an honor and privilege to be a Stanford Family Practice patient.
Superb visit with Dr. Jernick as always!
Dr. Jernick is best doctor I have had
Dr. Jernick was as impressive and thorough as ever! He even provided extra time to make sure to cover everything. Plus front desk and nursing were great. Outstanding!
Great job
An excellent listener helps to fill in the blanks from other caregivers.
Dr. Jernick and team delivered an exceptional health exam, as always
excellent service
Excellent doctor!
Dr. Jernick is the best doctor. Thank you very much!
Exceptional attention to my problems
Great visit felt well taken care of
excellent doctor
Jay Jernick has been my doctor for many years, and I highly recommend him.
Dr Jernick is the best!
Dr, Jernick is an excellent doctor who takes time with patients. He has explained things to me no one else has, and confirms or validates my experience. Although in this last visit the content was not what I wanted to hear regarding the need for a medicine I was having reactions to, I did learn more about the whys and wherefores, and he was always respectful of my need to more time to think about things and come to my own decisions about my options.
great people. on time
Dr. Jernick is a true , old school doctor . I never feel rushed, he answers all my questions, and I always feel better when I leave. I think it’s because he listens so well, he’s so knowledgeable,. He makes me feel like a valued,, old friend.
As always, Jay answered all my questions and addressed my concerns with humor, knowledge, and aplomb. A real joy to work with!
Dr Jernick is one of the best doctors I have ever had and I have had some real good ones.
Great visit w/ the Dr - he & the staff were very attentive & supportive.
Dr. Jernick is excellant
He is extremely thoughtful and knowledgeable about my issues, really listens compassionately, and answers all of my questions thoroughly. A real doctor's doctor!
I would without the slightest hesitation... Although I hope that wouldnt make him too busy!
The provider has helped me keep tabs on my health for years. I much appreciate the continuity in care.
Always great to see Dr Jernick
J Jernick is a fabulous primary care physician in every way!
He is the best!
Dr. Jernick is thoughtful, attentive, and caring along with his vast supply of knowledge, wisdom, and skill.
We covered the required things and then Dr. J allowed plenty of time for me to speak. He was personally engaged and listened carefully to what I shared and was enthusiastic about material I offered that had made an dramatic difference in my life and experience of my health issuesl.
The staff, Eva, Dr. Jernick all were professional , kind and attentive
Dr. Jernick is a wonderful doctor. He always listens carefully to me and never makes me feel rushed. He answers my questions and never makes me feel uncomfortable. He always checks to see what tests might be due soon.
He's the best
Dr. Jernick has been my PCP for many years. I trust his advice and will follow through with his recommendations.
Dr. Jernick is the best doctor in the world. I've been his patient for more than 20 years.
Dr Jernick has been our provider for many years and we are very pleased with him. We highly recommend him to others.
Except for appointment delay, the doctor is good, the facility is good.
I just adore Dr. Jernick.
Excellent physician!
Dr Jernick outstanding we have been his patient last 30 years. Very friendly, cheerful & personable. You have to b lucky to get this doctor.
The best!
Truly appreciated the help Dr. Jernick offered in dealing with the bureaucracy of paperwork regarding a situation.
Dr. Jernick listens well and with broad medical knowledge offering practical advice
Have done so many times though he is very busy
Friendly, knowledgeable and discuss about the blood work very well
It is always good to talk to him about what I need to do and decide about my health. He is a great doctor.
The dr was very attentive and we walked through my medical concerns. The appointment was very convenient
Excellent doctor.
Thank you.
Dr. Jernick was superb!
Always a pleasure to talk with Dr. Jernick. He is clear, sensitive, and responsive.
Insufficient room here to say all the great things about Dr. Jay Jernick. I do wonder sometimes how it is that I've aged considerably in the 35 years I've known Dr. Jernick, yet he looks exactly the same. Fountain of Youth was clearly not on our medical plan, all these years. 8^)
He's a very patient, nice, and helpful doctor. I have been his patient for about 30 years and enjoy seeing him.
Dr. Jernick is exceptional. when i arrive i am often flustered and stressed. Dr Jernick is always calm, has a very nice way, and always asks how i'm doing and listens very attentively to my answer. i have complete confidence in his knowledge and treatment. i never feel rushed, and when i leave my mind is at rest.
Jay Jernick, MD has been my primary care provider for over 30 years. I am the luckiest person to be under his attentive and compassionate care.
Dr. Jernick is an outstanding physician. Excellent diagnostic skills. Excellent interaction skills.
Dr Jernick is the best always takes time for all questions and answers them so I understand what's going on
No issues, went well.
Dr. Jay Jernick is the very best ever!! I worship his care and guidance!
My doctor, Dr. Jay is my family. He explains everything to me in a basic way that I understand his instructions about how I am, my treatments and medications.
Everything perfect
Dr. Jernick is an excellent doctor. Explained everything and now my trigger finger is not painful anymore. He is more than 5 stars.
Very good.
appreciate the conversational style, no judgement, providing choices on next steps in care
An impressively encouraging & informative appointment. Very appreciative.
Dr. Jernick was very thorough! I was impressed. That's not my typical experience at any clinic - Stanford or Sutter!
Doctor Jernick is outstanding. There is no compare. We have been patient for last 30 yrs.
DR. Jernick has always been wonderful. I have every confidence in his opinions.
Dr. Jernick is the best!
Dr. Jernick is best doctor ever.
Dr. Jernick is best doctor I have ever had.
Dr. Jernick is amazing! I love that he listens to my medical issues but always ask if anything else in my life has changed. Also, he's a great listener and it always surprises me that he remembers things I told him 5 ears ago.
Dr. Jernick always shows interest any my family history and any concern I might have.
Did not feel rushed very comfortable and professional but easy to talk too.
Our family has been seeing Dr Jernick for 17 years and he is always kind, engaged, thoughtful, and takes time to make you feel really heard and cared for.
Dr. Jernick is the best physician I have ever encountered, very grateful to be his patient!
Dr. Jernick is an excellent doctor. Listens, understands, explains.
dr. Jernick has been an excellent source of wisdom and comfort in the past 23 years which he's been my primary care provider. he is the best.
Dr. Jernick has been our family physician for 30+ years. I would follow him to the ends of the earth for his excellent care. Fortunately he remains at Stanford so I will see him as my doc for as long as possible.
Dr. Jernick should be the role model for all the student doctors. He is patient, understanding, explains things very clearly, never appears to be in a hurry, and listens very carefully to any questions or concerns. I am so grateful to have Dr. Jernick as my primary care physician. i trust him completely.
Dr. Jernick is by far the best general practitioner at Stanford Family Health. He is very perceptive and deeply concerned about his patient's well-being.
Dr. Jernick is a wonderful doctor. Caring and very knowledgeable. He will also tell you if he's unsure, we (my husband and I) are just so lucky to have him as my doctor. We've been with him for many years.
Dr. Jernick is a paragon of a good doctor. Simply the best.
Dr. Jernick is always very nice and very helpful.
Dr. Jernick, my former and now future PCP, had studied my chart prior to the visit, and offered to keep an eye on all future treatment for my problem. Very consoling!
Dr. Jernick is the finest doctor I have ever met.
Dr Jernick has been our family doctor for 35 yrs. He has always show extraordinary concern for us and provided the highest level of care.
Has been my care provider since 1985. He is considerate, competent. I have recommended him to my wife and 3 friends who have been his patients for over 25 years now.
I trust Dr. Jernicks judgment absolutely. His approach is common sense & practical -
Exceptional in every respect.
Dr. Jernick is excellent.
I have complete confidence in Dr. Jernick's medical skills and most importantly his judgment.
Dr. Jernick has been our family physician since 1989. We are fortunate and grateful to be under his care.
Dr. Jernick is the best GP I've had since moving to Stanford from Kaiser. I have extreme confidence in him.
Dr. Jernick is a great doctor. I am fortunate to have him as my primary care doctor.
Dr. Jernick is an excellent care provider.
Dr. Jernick is exemplary! I feel so lucky to have him as my PCP. I have never had an MD in the past who was so caring and thorough. He makes me feel at ease and there is always two-way communication. Together, we have teamwork in care.
Dr. Jernick is extraordinary in every way -
Dr. Jernick has a great manner.
I am very please with the care I receive from Dr. Jernick.
Dr. Jernick is ABSOLUTE TOP NOTCH. Don't retire. Can't do without him.
I have been a patient of Dr. Jernick for at least 30 years. Before becoming a patient I must have visited/tried lots of physicians at various clinics and hospital in the Santa Clara and San mateo counties. I have recommended him to friends and now my wife and 4 friends are his patients. I have jokingly told him never to retire as I would be lost, medically and healthwise if he does.
Dr. Jernick is an excellent and outstanding care provider. I have high confidence and always look forward to conversing with him about my health and any problems I may have at the time. He is courteous and friendly and always keep you at ease. I will highly recommend him to others. He provides excellent care.
Dr. Jernick is an outstanding care provider. I will not hesitate to recommend him to others.
I don't have words to say about Dr. Jernick. He is exceptional going to him last 24 years. By all means we recommend him.
very good
Dr.Jernick is awesome. He always make you feel like he is listening and concerned.
Dr Jay is the best!
Excellent care & concerned follow up!! Thank you.
Dr Jernick provides outstanding care
Dr. Jernick has a terrific "bedside manner."
Dr. Jernick is a world class physician. He has been my family doctor for over 30 years. He listens well and takes in all information. His advice on my health issues has always been spot on. I have complete confidence and trust in him on all my health issues.
Dr. J is very caring & has been my family's care provider for about 20 yrs.
Dr jernick was very helpful - later sent me links with information that was valuable to me
I have had Dr. Jernick as my doctor for several years and think he is outstanding!
Dr. Jernick is the best.
I feel like I'm in very good hands with Dr. Jernick. He is thorough, detail oriented, so knowledgeable, determined to help, and delivers with great efficiency. I feel as though I can talk with him about any concerns or issues and be made to feel like we are all part of a team in charge of my healing process. I can joke around with him, too. That's a good thing.
Excellent doctor!
Excellent doctor. Very caring, horrible always treat with positive attitude.
Dr. Jernick has been our family physician for nearly 30 years. He cares for us all profoundly and we have thrived under his watch.
He could not be BETTER!
Jay listened carefully to the (long) list of symptoms, asked good questions, did an exam, and figured out that the symptoms were not caused by recent medications (as we had suspected), but an old one. I felt better within days of discontinuing it. Jay's been my doctor for many years, because he is by FAR the best I've ever met. His medical skills are clearly excellent, but his social skills are truly exceptional, which multiplies the positive effect of seeing him. I feel listened-to and well-cared for in a warm and welcoming way, and he genuinely respects me and my intelligence (even when I've been too ill for it to manifest itself).
Dr Jernik is a very caring person
Excellent visit with Dr. Jernick.
Dr. Jernick is wonderful & appreciated!
Dr Jernick was very helpful
Exceptional great Doctor.
Dr. Jay has been my doctor my whole life. I trust him and his staff completely!
Dr Jernick is outstanding. I appreciate his willingness to discuss my care, discuss options citing research and my risk factors.
John is "the man!" John Jernick
Dr. Jernick is very easy to communicate with.
Dr. Jernick is the very best....
All of my doctors at Stanford are outstanding. I am very confident that if Stanford Healthcare cannot save my life than no one can. Specially Dr. Jonh Jay Jernick is our family doctor for almost 25 years. We always respect his advice. We are lucky to be his patients.
Dr. Jernick is the best of the best of the best. I have so much respect for him and the quality of care he provides.
Dr. Jernick has always been very aware of my health and listens to my concerns. Dr. Jernick has become our family doctor as I would want the best for me and my family. He's also very personable and never rushes my appointments.
Dr. Jay Jernick is the best dr. I have ever had! I travel 1 1/2 hours to see him.
Dr. Jernick has my complete confidence. I've been a patient of his for over 30 years.
Is there a "10" score? This MD is tops in knowledge, skills, and "bedside manner!" I never feel rushed and always feel heard.
This provider is superb. I had recommended him to my wife (a patient), and my friends, a lot of whom are his patients.
Dr. Jernick is awesome!
Top notch - as Dr Jernick's care has always been over the many years he has been my Primary Care Dr
Dr. Jernick AND his staff are the best. You never feel rushed and always I feel that I matter to my doctor & his staff!
I have always had excellent care from Dr. Jernick
Dr Jernick is very good and very thorough and understanding. He is a very good doctor and a great human being!
After 30 years with this doctor I am used to him giving me proactive advice on my health and well being. He has demonstrated through the years devotion to providing me with the very best health care and has shown concern for me as a person too. I have recommended my co-workers and friends and my wife to him and they are among his patients.
Dr Jernick is an excellent doctor, he has been my primary care physician for years, and I feel very comfortable with him and trust his judgement. He is always ready to respond to my concerns and answer my questions to my satisfaction.
Provider has been health care provider for more than 25-30 yrs. cares for whole family.
Don't have bad experiences at Fam Practice
He's been my provider since I was born (27 years ago!). I always feel confident and satisfied whenever I visit.
Dr. Jay Jernick is a very excellent provider. He cares for his patients.
Dr. Jernick is an exceptional clinician. My hope is that he remains my doctor for decades to come.
The care provider is always friendly, courteous, and attentive to issues/medical question that are being discussed and give detailed instructions/recommdations. I have the utmost confidence with him and will definitely recommend him to others.
The appointment in question was for an annual physical exam. Generally, the care provider was thorough and helpful. However, I am still waiting to receive instructions for follow-up care on one issue.
This doctor was a substitute for my Doctor Gross who was sick, but the doctor was efficient and treated me as if he were my own doctor for a long time.
Dr John Jay Jernick is the best physician I have ever known.
Dr. Jernick is the best, he has no faults. Would highly recommend him to everyone.
Love to see Dr. Jernick my family doctor.
Wonderful physician.
By far, Dr. Jernick is the single BEST and MOST SKILLED/KNOWLEDGEABLE physician I have known - He is simply superb!!!
Awesome doctor!
Dr. Jernick is, simply, the best.
Dr. Jernick is an amazing care provider, on all sides - personal, clinical, ALL.
Dr John Jernick he is best doctor of all.
Dr. Jernick is great!!

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