Glenn Geoffrey Preston, M.D.
Glenn Geoffrey Preston is a Hematology & Oncology specialist based in Spencer, IA with over 31 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
With over 31 years in internal medicine, Glenn Geoffrey Preston, M.D. is a long-established hematology & oncology specialist in Spencer. Trained at University of Missouri, Columbia School of Medicine (class of 1995), he has been practicing for over 31 years. Among his Medicare patients, common conditions include hypertension, high cholesterol, and cancer (per CMS data).
At a glance
- Uses generic medications more than 60% of reporting doctors in Iowa
- Virtual visits available — no app or travel required
Older · 4782dNPPES updated 2013-04-19 · verify NPI on CMS · Verify license at Iowa Board of Medicine
Contact & Location
Practice Location
1200 1st Ave E Abben Cancer Center, Spencer, IA 51301-4330
How Does This Doctor Compare?
Based on Medicare data, this doctor favors affordable generic drugs over brand-name ones.
Opioid Rx
↓ Lower = better7.08%
Iowa avg: 2.9 · US avg: 5.1
⚠ Lower than most doctors nationally(+2 pts)
7.08% of this doctor's prescriptions are opioid pain medications. Lower means more cautious prescribing.
Generic Rx
↑ Higher = better90.3%
Iowa avg: 84.9 · US avg: 82.8
✓ Higher than most doctors nationally(+7.5 pts)
Typical range among reporting doctors in IowaHow often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
444
Unique beneficiaries
Standard volumePrescription Recipients
247
Patients prescribed
Prescriptions Written
918
Total claims
Total Medicare drug cost: $1.02M
Percentile rankings compared against 75 reporting peers in Iowa.
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 Cancer.
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%↓ Fewer patients than average (-4%) — less common here
Diseases involving abnormal cell growth with potential to spread to other body parts
US avg: 20.8%↑ More patients than average (+31%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-13%) — less common here
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%Reduced blood flow to the heart muscle, commonly known as coronary artery disease
US avg: 31.7%↓ Fewer patients than average (-6%) — less common here
Chronic Obstructive Pulmonary Disease — a group of lung diseases that block airflow
US avg: 20.4%↑ More patients than average (+5%) — a focus area for this doctor
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$125 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 Glenn Geoffrey Preston's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1995
University of Missouri, Columbia School of Medicine
31 years in practice
Senior practitioner
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
Education & Training
University of Missouri, Columbia School of Medicine (Class of 1995)
Virtual Hematology & Oncology Care With Glenn Geoffrey Preston
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Glenn Geoffrey Preston for blood pressure monitoring, cholesterol management, follow-up consultations — no travel to Spencer 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 Glenn Geoffrey Preston
Dr. Preston is listed as active in the NPI registry with telehealth listed in Spencer, IA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (712) 264-6550.
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 Glenn Geoffrey Preston
Practice Location
1200 1st Ave E Abben Cancer Center, Spencer, IA 51301-4330
Mailing Address
1200 1st Ave E Abben Cancer Center, Spencer, IA 51301-4330
This is a provider directory. Contact the office directly to schedule appointments.
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