Jon Stephen Portnoff, MD
Cardiology
Highlights
Age Groups Seen
- Adult 21-65
- Older Adult >65
Languages
- English
Gender
MaleAbout Jon Stephen Portnoff
Provider Type
Physician
Locations
- Heart & Vascular: Adventist Health
- 115 Hospital Drive, Ukiah, CA 95482
- Get Directions
- phone: 707-463-2400
Expertise
Education
- Medical School: American University of the Caribbean
- Fellowship Program: Loma Linda University School of Medicine
- Internship Program: Morristown Memorial Hospital
- Internship Program: Aurora Sinai Medical Center
- Residency Program: Aurora Sinai Medical Center
Insurance
- Adventist Health Employee Health/Incentive Health
- Aetna
- Aetna (incl BH)
- AH Employee/ Incentive Health
- Anthem
- Blue Cross
- Blue Shield
- Cigna
- Galaxy
- Health Net
- Health Smart
- HealthNet
- HealthSmart
- Medical ORP
- Medicare Railroad
- Medicare RR
- Multiplan5
- Network by Design
- Partnership (Under Hospital TIN)
- Partnership Health Plan
- PAVE
- Tricare
- TriWest3
- UHC
- Western Growers (incl BH)
Ratings & Reviews
5 out of 5
122 ratings, 30 reviewsOur providers are at the heart of delivering whole-person care. We encourage patients to share their experiences through a patient satisfaction survey they receive following visits. Provider star ratings are calculated using patient responses to provider-focused questions in this survey. Please see the provider’s star rating and patient reviews below. Thank you for giving Adventist Health the opportunity to support your best health.
- 5 out of 5 starsReviewed on 3/27/2026
I waited the 4 months for my appointment because I wanted specifically to see Dr.Portnoff. I was very impressed with his knowledge and the respect with which I was treated. I will be returning to his office for more testing and care.
- 5 out of 5 starsReviewed on 2/20/2026
Very attentive and knowledgeable physician. Fortunate to be under his healing care.
- 5 out of 5 starsReviewed on 2/19/2026
Dr Portnoff is the best Dr I've ever had!
- 5 out of 5 starsReviewed on 2/14/2026
Great help
- 5 out of 5 starsReviewed on 2/12/2026
Excellent, Dr Portnoff always explains things very clearly and pleasantly, thank you
- 5 out of 5 starsReviewed on 2/8/2026
Dr. Portnoff is always positive and has a very gentle manner!
- 5 out of 5 starsReviewed on 1/29/2026
Dr Portnoff is very knowledgeable,professional and kind, and takes time to thoroughly address questions.
- 5 out of 5 starsReviewed on 12/31/2025
Dr. Portnoff is above and beyond!
- 5 out of 5 starsReviewed on 12/31/2025
Such a great doctor, patient and open to answering all my questions
- 5 out of 5 starsReviewed on 12/27/2025
Professional good sense of humor
- 5 out of 5 starsReviewed on 11/16/2025
Dr. Portnoff is always a joy to have an appt with.
- 5 out of 5 starsReviewed on 10/23/2025
Excellent bed side manner'. Good listener and simple explanations given to understand my condition.
- 5 out of 5 starsReviewed on 10/16/2025
The good doctor has been keeping an eye on me for over 13 years.
- 5 out of 5 starsReviewed on 10/9/2025
Everything went well !
- 5 out of 5 starsReviewed on 10/9/2025
Caring professional
- 5 out of 5 starsReviewed on 10/9/2025
Very compassionate
- 5 out of 5 starsReviewed on 10/2/2025
Doctor Portnoff has always been great to me and explains everything
- 5 out of 5 starsReviewed on 9/26/2025
Dr. Portnoff professional, skilled and caring
- 5 out of 5 starsReviewed on 9/8/2025
Dr Portnoff is always professional, kind and caring. He always listens to my questions and answers them fully. He is very patient and I never feel rushed. He is an excellent physican!
- 5 out of 5 starsReviewed on 8/13/2025
Dr. Portnoff always listens and is very present in the conversation.
- 5 out of 5 starsReviewed on 8/9/2025
Love that he listens and advises you knows his stuff.
- 5 out of 5 starsReviewed on 7/31/2025
Dr Portnoff is knowledgeable, kind, and listens well. Appreciative of his care
- 5 out of 5 starsReviewed on 7/11/2025
Dr Portnoff was very good and I would easily recommend d him to an acquaintance.
- 5 out of 5 starsReviewed on 7/3/2025
Love Dr Portnoff
- 5 out of 5 starsReviewed on 7/3/2025
Very nice visit and discussion with Dr. Portnoff.
- 5 out of 5 starsReviewed on 6/26/2025
Love Dr Portnoff
- 5 out of 5 starsReviewed on 6/26/2025
Dr. Portnoff is a patient listener.
- 5 out of 5 starsReviewed on 6/23/2025
Very nice asked good questions,listened to me very carefully never seemed rushed
- 5 out of 5 starsReviewed on 5/30/2025
Dr Portnoff is great recommend him to everybody
- 5 out of 5 starsReviewed on 5/20/2025
Dr. Portnoff should never retire! He is the bomb! I mean that in a good way