Dr. Gerald Francis Bresnahan, MD
- Part D claims, 2021
- 24
- Industry payments
- $52
- Affiliated sites
- 1
- State license
- 1
- Year NPI issued
- 2006
- Practice address
- 21950 Copley Dr, Diamond Bar, CA 91765
- Practice phone
- Call (626) 840-1023
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Call the Car
Diamond Bar, California
Find Dr. Bresnahan'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. Gerald Francis Bresnahan is a cardiologist in Diamond Bar, California
Dr. Bresnahan practices at Call the Car in Diamond Bar, California.
Dr. Bresnahan's NPI, 1891855466, was assigned on December 12, 2006. Dr. Bresnahan holds California license G14924.
- NPI
- 1891855466NPI Registry (opens in a new tab)
- NPI enumeration date
- December 12, 2006
- NPI status
- Active
- Practice phone
- (626) 840-1023
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Gerald Francis Bresnahan practices at Call the Car in Diamond Bar, California
Dr. Bresnahan's primary practice is Call the Car, at 21950 Copley Dr, Diamond Bar, CA 91765 in Los Angeles County. The practice phone is (626) 840-1023.
- Call the Car21950 Copley Dr, Diamond Bar, CA 91765 · Los Angeles CountyPhone(626) 840-1023
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gerald Francis Bresnahan is affiliated with 2 sites of care
Dr. Bresnahan's primary practice is Call the Car in Diamond Bar, California. Dmand AI also links Dr. Bresnahan to 1 physician office, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gerald Francis Bresnahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Bresnahan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Call the Car | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gerald Francis Bresnahan is one of 2,375 cardiologists in California
Cardiovascular disease is Dr. Bresnahan's primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Bresnahan is licensed in California.
Specialties and state licenses
- Cardiovascular disease, CaliforniaPrimary
Cardiologists near Dr. Bresnahan
Counts of cardiologists 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. Gerald Francis Bresnahan's patients have a median age of 83
Across all payers, Dmand AI patient panel data puts Dr. Bresnahan's median patient age at 83.
Dr. Bresnahan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 83
Source: Dmand AI Patient Panel Data
Dr. Gerald Francis Bresnahan wrote 24 Medicare Part D claims in 2021
In 2021, Dr. Bresnahan wrote 24 Medicare Part D claims. Every claim was for a generic drug. They cover 2 drugs, with $215 in total drug cost. In 2019, CMS named 13 claims across 1 drug.
Dr. Bresnahan's most prescribed drugs by claims, 2021
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2019 to 2021
- 2019
- 2021
- Claims for drugs CMS names
- 2019: 132021: 2485%
Drugs named by CMS: 2 in 2021, 1 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Gerald Francis Bresnahan received $52 in industry payments from 2020 to 2021
CMS Open Payments shows 3 general payments to Dr. Bresnahan from 1 drug or device company from 2020 to 2021. Food and beverage make up the largest share, 100% of the total. Astellas Pharma US Inc paid the most, $52.
General payments to Dr. Bresnahan by program year, 2020 to 2021
Companies that paid Dr. Bresnahan the most, 2020 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Gerald Francis Bresnahan'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Gerald Francis Bresnahan
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. Gerald Francis Bresnahan's NPI number?
Dr. Gerald Francis Bresnahan's NPI number is 1891855466. It was assigned on December 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gerald Francis Bresnahan?
Dr. Gerald Francis Bresnahan is a cardiologist in Diamond Bar, California. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. Gerald Francis Bresnahan practice?
Dr. Bresnahan practices at 21950 Copley Dr, Diamond Bar, CA 91765. Dr. Bresnahan's primary practice is Call the Car in Diamond Bar, California. Dmand AI also links Dr. Bresnahan to 1 physician office.
What is Dr. Gerald Francis Bresnahan's office phone number?
The practice phone on file for Dr. Bresnahan is (626) 840-1023.
What is Dr. Gerald Francis Bresnahan's medical license number?
Dr. Bresnahan holds California license G14924.
What drugs does Dr. Gerald Francis Bresnahan prescribe most?
In 2021 Medicare Part D data, Dr. Bresnahan's most prescribed drugs by claims were Baclofen and Gabapentin.
Has Dr. Gerald Francis Bresnahan received payments from drug or device companies?
CMS Open Payments shows $52 in general payments to Dr. Bresnahan from 1 company from 2020 to 2021. The largest total came from Astellas Pharma US Inc.
How long has Dr. Gerald Francis Bresnahan been practicing?
Dr. Bresnahan's NPI was assigned in 2006.
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