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Dr. Tammy Sievers

Rheumatology • Ventura, CA

★★★☆☆2.5/547 reviews across 2 platforms

Ratings by platform

  • U.S. News & World Report: Not specified (128 reviews) (128 reviews)
  • Healthgrades: 2.5/5 (44 reviews)
  • Sharecare: 2.3/5 (3 reviews)
  • Yelp (as Tammy Cheng): Not specified (13 reviews) (13 reviews)

What patients say

Patients praise

  • Thorough in knowledge and treatment of certain chronic conditions like fibromyalgia
  • Willingness to listen to concerns and consider treatment options

Common complaints

  • Perceived lack of compassion or empathy
  • Issues with office staff and record-keeping fees
  • Patient reports of the doctor seeming disassociated with their care
  • Mixed/Low average ratings on several aggregate platforms

In patients' words

"Simple error yet ZERO compassion on their side. When I asked for my medical records they said they would have to charge me for them. They have no consideration ..."

— WebMD

"Dr always seems to be disassociated with my care."

— Vitals

"I’ve been seeing Dr. Sievers for +two years now. I have found her to be very thorough in her knowledge and treatment of my struggle with fibromyalgia. She listens to all my concerns and takes time to consider all options available for my care."

— Sharecare

How these reviews were compiled

Synthesized from public patient-review platforms as of Jul 10, 2026 — sources: [1][2][3][4][5][6][7].

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