Cassandra Leigh Thomas, M.D.
Cassandra Leigh Thomas is a Hematology & Oncology specialist based in Ventura, CA with over 17 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Cassandra Leigh Thomas, M.D. has been part of the Ventura medical community since 2009 in group practice. She has been in practice for 17+ years. She regularly sees Medicare patients with hypertension, high cholesterol, and arthritis (per CMS claims data).
At a glance
- Uses generic medications more than 25% of reporting doctors in California
- Virtual visits available — no app or travel required
Older · 187dNPPES updated 2025-11-17 · verify NPI on CMS · Verify license at Medical Board of California
How Does This Doctor Compare?
Based on Medicare data, this doctor favors affordable generic drugs over brand-name ones.
Generic Rx
↑ Higher = better80.7%
California avg: 83.3 · US avg: 82.8
⚠ Lower than most doctors nationally(-2.1 pts)
How often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
111
Unique beneficiaries
Standard volumePrescription Recipients
71
Patients prescribed
Prescriptions Written
150
Total claims
Total Medicare drug cost: $124k
Percentile rankings compared against 9,360 reporting peers in California.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Arthritis.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↑ More patients than average (+5%) — a focus area for this doctor
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↑ More patients than average (+5%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↑ More patients than average (+11%) — a focus area for this doctor
Diseases involving abnormal cell growth with potential to spread to other body parts
US avg: 20.8%↑ More patients than average (+30%) — a focus area for this doctor
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↑ More patients than average (+11%) — a focus area for this doctor
Conditions affecting emotional state, including depression and bipolar disorder
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↑ More patients than average (+11%) — a focus area for this doctor
An irregular, often rapid heartbeat that increases the risk of stroke
US avg: 22%↑ More patients than average (+19%) — a focus area for this doctor
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$43 received from industry
1 transaction reported in 2024 ·Low tier
Payments include consulting fees, speaking honoraria, food & beverage, travel, research support, and ownership interests from drug and medical device manufacturers. Disclosure is required by the federal Physician Payments Sunshine Act. These payments do not necessarily indicate conflicts of interest. National median: $338 across 136 000 tracked providers.
Tiers — Low: under $500 · Moderate: $500-5 000 · High: $5 000-25 000 · Very High: $25 000+. Source: CMS Open Payments 2024, attributed to Cassandra Leigh Thomas's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Board certified · Nov 16, 2025
Self-reported via NPPES
17 years in practice
Experienced
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
Taxonomy: 207RH0003X
Primary hospital affiliation: Acute Care Hospitals
CMS Certification Number: 190316
View hospital on Medicare Care CompareVirtual Hematology & Oncology Care With Cassandra Leigh Thomas
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Cassandra Leigh Thomas for blood pressure monitoring, cholesterol management, arthritis follow-ups — no travel to Ventura required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Cassandra Leigh Thomas
NPI records show Dr. Thomas as active with telehealth listed in Ventura, CA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (805) 652-6218.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
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Contact Cassandra Leigh Thomas
Practice Location
300 Hillmont Ave Ste 501, Ventura, CA 93003-1651
Mailing Address
300 Hillmont Ave Ste 501, Ventura, CA 93003-1651
This is a provider directory. Contact the office directly to schedule appointments.
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