Dr. Glenn Geoffrey Preston, MD
- Medicare services, 2024
- 989
- Medicare patients, 2024
- 301
- Part D claims, 2024
- 1,192
- Hospital affiliations
- 6
- Industry payments
- $790
- Practice address
- 1501 W Chisholm St, Alpena, MI 49707
- Practice phone
- Call (989) 356-7390
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Preston's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Glenn Geoffrey Preston is a hematologist and oncologist in Alpena, Michigan
Dr. Preston practices at MyMichigan Medical Center Alpena in Alpena, Michigan, part of MyMichigan Health.
Dr. Preston's NPI, 1194796243, was assigned on January 27, 2006. Dr. Preston graduated from University of Missouri, Columbia School of Medicine in 1995. Dr. Preston holds Iowa license 40571.
- NPI
- 1194796243NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9032121611
- NPI enumeration date
- January 27, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (989) 356-7390
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Glenn Geoffrey Preston practices at MyMichigan Medical Center Alpena in Alpena, Michigan
Dr. Preston's primary practice is MyMichigan Medical Center Alpena, at 1501 W Chisholm St, Alpena, MI 49707 in Alpena County. The practice phone is (989) 356-7390.
- MyMichigan Medical Center Alpena1501 W Chisholm St, Alpena, MI 49707 · Alpena CountyPhone(989) 356-7390
Source: Dmand AI Affiliation Data
Dr. Glenn Geoffrey Preston is affiliated with 6 sites of care and 3 medical groups
Dr. Preston's primary practice is MyMichigan Medical Center Alpena in Alpena, Michigan, part of MyMichigan Health. Dr. Preston is also affiliated with University Hospital. The medical group on file is MyMichigan Health. Dmand AI also links Dr. Preston to 4 more hospitals and 2 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Glenn Geoffrey Preston's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Preston practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| MyMichigan Medical Center Alpena | Available with a free account |
| +5 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across MyMichigan Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Glenn Geoffrey Preston is one of 298 hematologists and oncologists in Michigan
Hematology and oncology is Dr. Preston's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dr. Preston is licensed in Iowa.
Specialties and state licenses
- Hematology and oncology, IowaPrimary
Hematologists and oncologists near Dr. Preston
Counts of hematologists and oncologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Glenn Geoffrey Preston billed Medicare for 989 services in 2024
CMS data shows 989 Medicare services from Dr. Preston across 2 procedure codes in 2024, all of them office visits, for 301 Medicare patients. Medicare paid $70,910 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Preston's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,0102024: 9892%
Dr. Preston compared with the Michigan median for hematologists and oncologists, 2024
- Dr. Preston
- Michigan median
- Medicare services
- 989vs 61960% above
- Medicare patients
- 301vs 22832% above
- Part D claims
- 953vs 3782.5 times
Medians across 291 hematologists and oncologists in Michigan with Dmand AI profiles that report each measure.
Dr. Preston's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Glenn Geoffrey Preston treated 301 Medicare patients in 2024, average age 74
CMS counts 301 Medicare patients who saw Dr. Preston in 2024. The largest group is 65 to 74, with 120 patients. 75% of them have high blood pressure, and 73% have high cholesterol. 17% are also on Medicaid. Their average risk score is 1.60, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Preston's median patient age at 77, with 57% women.
Dr. Preston's Medicare patients by age, 2024
Dr. Preston's Medicare patients by sex, 2024
- Women17859%
- Men12341%
Chronic conditions among Dr. Preston's Medicare patients, 2024
- High blood pressure75%
- High cholesterol73%
- Arthritis46%
- Cancer45%
- Ischemic heart disease33%
- COPD30%
- Chronic kidney disease30%
- Diabetes30%
Share of Medicare patients with each condition. A patient can have several.
Dr. Preston's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 77
Patient panel by sex, all payers
- Women57%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Glenn Geoffrey Preston wrote 1,192 Medicare Part D claims in 2024
In 2024, Dr. Preston wrote 1,192 Medicare Part D claims for 263 patients. 85% of them were for generic drugs. CMS names the drug for 953 of them, across 29 drugs with 11 or more claims each, at $1,689,213 in total drug cost. In 2023, CMS named 717 claims across 22 drugs.
Dr. Preston's Part D claims by kind of drug, 2024
- Generic1,010 claims85%
- Brand-name182 claims15%
Dr. Preston's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Preston's Part D claims, 2024
- Opioids10%114 of 1,192 claims
- Antibiotics3%30 of 1,192 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 7172024: 95333%
Drugs named by CMS: 29 in 2024, 22 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Glenn Geoffrey Preston offers telehealth to Medicare patients
Dr. Preston accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Preston as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Glenn Geoffrey Preston received $790 in industry payments from 2018 to 2025
CMS Open Payments shows 13 general payments to Dr. Preston from 8 drug and device companies from 2018 to 2025. Food and beverage make up the largest share, 61% of the total. Astellas Pharma US Inc paid the most, $255.
General payments to Dr. Preston by program year, 2018 to 2025
General payments to Dr. Preston by kind, 2018 to 2025
- Food and beverage$47961%
- Education$31139%
Companies that paid Dr. Preston the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Glenn Geoffrey Preston graduated from University of Missouri, Columbia School of Medicine
Dr. Preston graduated from University of Missouri, Columbia School of Medicine in 1995.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Glenn Geoffrey Preston's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Glenn Geoffrey Preston
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Glenn Geoffrey Preston's NPI number?
Dr. Glenn Geoffrey Preston's NPI number is 1194796243. It was assigned on January 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Glenn Geoffrey Preston?
Dr. Glenn Geoffrey Preston is a hematologist and oncologist in Alpena, Michigan. The primary specialty in the NPI Registry is Hematology & Oncology Physician (taxonomy code 207RH0003X).
Where does Dr. Glenn Geoffrey Preston practice?
Dr. Preston practices at 1501 W Chisholm St, Alpena, MI 49707. Dr. Preston's primary practice is MyMichigan Medical Center Alpena in Alpena, Michigan, part of MyMichigan Health. Dmand AI also links Dr. Preston to 4 hospitals and 2 medical groups.
What is Dr. Glenn Geoffrey Preston's office phone number?
The practice phone on file for Dr. Preston is (989) 356-7390.
What is Dr. Glenn Geoffrey Preston's medical license number?
Dr. Preston holds Iowa license 40571.
Which hospitals is Dr. Glenn Geoffrey Preston affiliated with?
Dr. Preston practices at MyMichigan Medical Center Alpena in Alpena, Michigan. Dr. Preston is also affiliated with University Hospital. Dmand AI links Dr. Preston to 4 more hospitals.
What medical group is Dr. Glenn Geoffrey Preston part of?
Dr. Preston is linked to MyMichigan Health. Dmand AI links Dr. Preston to 2 more medical groups.
Does Dr. Glenn Geoffrey Preston accept Medicare?
Yes. CMS data shows Dr. Preston billed Medicare for 989 services in 2024, and Dr. Preston accepts Medicare assignment.
Does Dr. Glenn Geoffrey Preston offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Preston as offering telehealth services.
How many Medicare patients does Dr. Glenn Geoffrey Preston see?
CMS counts 301 Medicare patients who saw Dr. Preston in 2024, with an average age of 74.
Show 5 more questionsShow fewer questions
What services does Dr. Glenn Geoffrey Preston bill to Medicare?
In 2024, Dr. Preston's most billed Medicare services were office visit, established patient (99214) and office visit, new patient (99204).
Where did Dr. Glenn Geoffrey Preston go to medical school?
Dr. Preston graduated from University of Missouri, Columbia School of Medicine in 1995.
What drugs does Dr. Glenn Geoffrey Preston prescribe most?
In 2024 Medicare Part D data, Dr. Preston's most prescribed drugs by claims were Anastrozole, Prednisone and Prochlorperazine Maleate.
Has Dr. Glenn Geoffrey Preston received payments from drug or device companies?
CMS Open Payments shows $790 in general payments to Dr. Preston from 8 companies from 2018 to 2025. The largest total came from Astellas Pharma US Inc.
How long has Dr. Glenn Geoffrey Preston been practicing?
Dr. Preston graduated from medical school in 1995, 31 years ago.
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