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Summary: You’re looking for cardiology care in Ukiah, CA through Adventist Health Ukiah. Adventist Health operates 32 U.S. offices, including Adventist Health Ukiah Valley. To find a cardiologist or cardiac services in Ukiah, visit Adventist Health Ukiah Valley’s site and look for Cardiology or Cardiovascular Services, or use ProviderMatch/Find a Doctor tools on Adventist Health’s network page. If you want, I can pull the exact cardiology providers and appointment links from Adventist Health Ukiah Valley’s cardiology page.

Clinic Type

Cardiology

Address

115 Hospital Drive, Ukiah, CA 95482

Phone

707-463-2400

Email

Opening Hours

Not published — contact the clinic to confirm hours.

Services Offered

Team

  • David R Ploss, MD — MD
  • Julie Ann Miner, FNP — FNP
  • Jon Stephen Portnoff, MD — MD
  • Kundai Kelvin Tanganyika, MD — MD

Insurance & Payment

Languages Spoken

Photos

What Patients Say

Overall sentiment across review platforms: mixed

  • Adventist Health ProviderMatch (Dr. David R. Ploss): 4.8 out of 5 stars (364 ratings, 38 reviews) (38 reviews)
  • Adventist Health ProviderMatch (Dr. Jon Stephen Portnoff): 5 out of 5 stars (111 ratings, 28 reviews) (28 reviews)
  • Adventist Health ProviderMatch (Julie Ann Miner, FNP): 4.9 out of 5 stars (101 ratings, 23 reviews) (23 reviews)
  • Healthgrades (Dr. David Ploss): 3.4 out of 5 stars (25 ratings) (25 ratings)

Patients praise

  • High satisfaction with clinical knowledge and expertise of specific providers
  • Appreciation for providers who listen attentively to patient concerns
  • Positive experiences with clear communication and thorough explanations from some staff members
  • Reports of kind, professional, and patient bedside manners from highly-rated practitioners

Common complaints

  • Perceived lack of engagement or "cold" bedside manner from some providers
  • Reports of poor communication regarding appointments and long wait times
  • Concerns about administrative/corporate focus potentially affecting care quality
  • Frustration with perceived lack of thorough examinations in some instances

"Dr Portnoff is the best Dr I've ever had! ... Excellent, Dr Portnoff always explains things very clearly and pleasantly."

Adventist Health ProviderMatch Review

"Julie Miner is truly one of the most caring health care practitioners at Adventist Health. She Is also very knowledgeable and applies that to each patient on an Individual basis."

Adventist Health ProviderMatch Review

"After waiting one hour in the exam room. He had no idea about the surgery... No discussion about anything. This is not the first time we have had disengaged doctors at Adventist Health."

Healthgrades Review (Dr. David Ploss)

Synthesized from public review platforms as of Jul 10, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 10, 2026.

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