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Jon Stephen Portnoff

Jon Stephen Portnoff, MD

Cardiology

Accepting New Patients
Affiliated Provider
4.9 of 5 stars149 ratings, 30 reviews
Need help scheduling? Call 707-463-2400

Highlights

Age Groups Seen

  • Adult 21-65
  • Older Adult >65

Languages

  • English

Gender

Male

About Jon Stephen Portnoff

Provider Type

Physician

Locations

  1. Heart & Vascular: Adventist Health

Expertise

Education

American University of the Caribbean

Medical School

Loma Linda University School of Medicine

Fellowship Program

Morristown Memorial Hospital

Internship Program

Aurora Sinai Medical Center

Internship Program

Aurora Sinai Medical Center

Residency Program

Insurance

Please contact the practice directly to confirm your health plan is accepted.
Search plans
  • Adventist Health Employee Health/Incentive Health
  • Aetna
  • AH Employee/ Incentive Health
  • Anthem Blue Cross
  • Blue Shield
  • Cigna
  • Galaxy
  • HealthNet
  • HealthSmart
  • Medi-cal ORP1
  • Medical ORP
  • Medicare Part B
  • Medicare Railroad
  • Medicare RR
  • Multiplan1
  • Network by Design
  • Partnership (Under Hospital TIN)
  • Partnership Health Plan
  • Tricare
  • TriWest
  • UHC
  • Western Growers

Ratings & Reviews

4.9 out of 5

149 ratings, 30 reviews

The provider star rating is calculated using patient responses to the five care provider questions in our patient satisfaction survey. Below you can see the provider’s star rating and the number of his or her patients who have provided feedback.

Provider explained things clearly
Provider showed concern
Provider included you in decisions
Likelihood of recommending this provider
Provider discussed treatment options
Search reviews
    5 out of 5 stars
    Reviewed on 9/26/2025

    Dr. Portnoff professional, skilled and caring

    5 out of 5 stars
    Reviewed 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 stars
    Reviewed on 8/13/2025

    Dr. Portnoff always listens and is very present in the conversation.

    5 out of 5 stars
    Reviewed on 8/9/2025

    Love that he listens and advises you knows his stuff.

    5 out of 5 stars
    Reviewed on 7/31/2025

    Dr Portnoff is knowledgeable, kind, and listens well. Appreciative of his care

    5 out of 5 stars
    Reviewed on 7/11/2025

    Dr Portnoff was very good and I would easily recommend d him to an acquaintance.

    5 out of 5 stars
    Reviewed on 7/3/2025

    Love Dr Portnoff

    5 out of 5 stars
    Reviewed on 7/3/2025

    Very nice visit and discussion with Dr. Portnoff.

    5 out of 5 stars
    Reviewed on 6/26/2025

    Love Dr Portnoff

    5 out of 5 stars
    Reviewed on 6/26/2025

    Dr. Portnoff is a patient listener.

    5 out of 5 stars
    Reviewed on 6/23/2025

    Very nice asked good questions,listened to me very carefully never seemed rushed

    5 out of 5 stars
    Reviewed on 5/30/2025

    Dr Portnoff is great recommend him to everybody

    5 out of 5 stars
    Reviewed on 5/20/2025

    Dr. Portnoff should never retire! He is the bomb! I mean that in a good way

    5 out of 5 stars
    Reviewed on 5/7/2025

    Dr. Portnoff is above and beyond! Very professional.

    5 out of 5 stars
    Reviewed on 4/15/2025

    I'm so relieved of my health concern after the detail explanation from the Doctor. I'm so happy and satisfied with the caring and concerns that provided by the doctor. He is super nice, friendly and awesome!

    5 out of 5 stars
    Reviewed on 3/19/2025

    Excellent experience

    5 out of 5 stars
    Reviewed on 3/14/2025

    Easy to talk to

    5 out of 5 stars
    Reviewed on 3/13/2025

    Everything went well !

    5 out of 5 stars
    Reviewed on 3/6/2025

    Dr Portnoff is wonderful. He listens to you and talks to you not down at you. Best doc in AH hands down

    5 out of 5 stars
    Reviewed on 2/11/2025

    I was able to share all my concerns and questions.

    5 out of 5 stars
    Reviewed on 2/9/2025

    I feel Dr. Portnoff is always present and cares

  • No RatingReviewed on 2/1/2025

    Have not actually had the appointment yet, did have very good help setting it up.

    5 out of 5 stars
    Reviewed on 12/8/2024

    Dr. Portnoff is kind, attentive and well versed in cardiac issues. While this was a six month check up, he is through in his questioning and responds with informative explanations.

    5 out of 5 stars
    Reviewed on 11/16/2024

    Dr. Portnoff is always very informative and very nice

    5 out of 5 stars
    Reviewed on 11/15/2024

    Dr. Portnoff is not only a very good physician, but a wonderful human being. He is very attentive in conversations and very compassionate. I felt that I was being taken care of by a good friend.

    5 out of 5 stars
    Reviewed on 11/9/2024

    Dr Portnoff cares about people and me

    5 out of 5 stars
    Reviewed on 11/6/2024

    The Dr. Has been very professional and has shown me great empathy and understanding caring for my illness. He has been instrumental in my getting the care I need and I will continue to recommend him to others in need.

    5 out of 5 stars
    Reviewed on 11/1/2024

    Answers all questions and presents needed treatment in an understandable manner.We already have recommended to others.

    5 out of 5 stars
    Reviewed on 10/24/2024

    Dr. Portnoff is incredible he is knowledgeable, always answers any of my questions and concerns, explains everything so that I understand my questions I'm blessed to be a patient of Dr. Portnoff

    5 out of 5 stars
    Reviewed on 10/24/2024

    Dr portnoff is the best Dr I have ever seen