Tammy Sievers, MD
Rheumatology • Ventura, CA
Information from public sources; not independently verified. Confirm hours, insurance and appointment availability with the clinic.
Last gathered July 10, 2026. How our information is sourced · Report incorrect information
About
Dr. Tammy Sievers is a rheumatologist affiliated with Community Memorial Healthcare in Ventura, California. She sees adult and older adult patients and accepts multiple insurance plans including Medicare, Blue Cross, Blue Shield, and United Healthcare. Dr. Sievers practices at Community Memorial Health Center locations in Camarillo and on Ashwood Avenue.
Services Offered
Team
Insurance & Payment
Languages Spoken
FAQs
What is the NPI number for Tammy Sievers, MD?
NPI Number: 1619004694
Social Media
Photos
Photos published by Tammy Sievers, MD showing the rheumatology practice in Ventura, CA.
What Patients Say
Overall sentiment across review platforms: mixed
- 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)
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
"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."
- SharecareSynthesized from public review platforms as of Jul 10, 2026 - sources: [1][2][3][4].
In the News
- Tammy Siemers Sparks Students to Serve - Lafayette Urban Ministry - Mar 19, 2026
- Photo Contest Honorable Mentions: Close Ups | Features | vcreporter.com - Jan 1, 2026
- Napa Solano Medical Society names physician of the year | Business | napavalleyregister.com - Jun 23, 2026
- A love letter to front-line healthcare workers | UAMS Health - Mar 6, 2026
- UNM-Valencia’s Tammi Duncan-Teller receives National Association of Biology Teachers award | UNM UCAM Newsroom - Nov 5, 2025
Information sourced from the clinic's website as of July 10, 2026.
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