Dr. Gerald Roy Nazareno, MD
- Medicare services, 2024
- 204
- Medicare patients, 2024
- 220
- Part D claims, 2024
- 266
- MIPS score, 2024
- 83
- Hospital affiliations
- 1
- Practice address
- 5555 West Las Positas Boulevard, Pleasanton, CA 94588
- Practice phone
- Call (925) 847-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Nazareno's professional email, personal email and mobile number
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Dr. Gerald Roy Nazareno is an emergency medicine physician in Pleasanton, California
Dr. Nazareno practices at Stanford Health Care Tri-Valley in Pleasanton, California, part of Stanford University.
Dr. Nazareno's NPI, 1679564983, was assigned on November 4, 2005. Dr. Nazareno holds California license A53590.
- NPI
- 1679564983NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6709774482
- NPI enumeration date
- November 4, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (925) 847-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gerald Roy Nazareno practices at Stanford Health Care Tri-Valley in Pleasanton, California
Dr. Nazareno's primary practice is Stanford Health Care Tri-Valley, at 5555 West Las Positas Boulevard, Pleasanton, CA 94588 in Alameda County. The practice phone is (925) 847-3000.
- Stanford Health Care Tri-Valley5555 West Las Positas Boulevard, Pleasanton, CA 94588 · Alameda CountyPhone(925) 847-3000
Source: Dmand AI Affiliation Data
Dr. Gerald Roy Nazareno is affiliated with 1 site of care and 1 medical group
Dr. Nazareno's primary practice is Stanford Health Care Tri-Valley in Pleasanton, California, part of Stanford University. The medical group on file is Pleasanton Emergency Medical Group.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gerald Roy Nazareno's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nazareno practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Stanford Health Care Tri-Valley | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gerald Roy Nazareno is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Nazareno's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dmand AI has Dr. Nazareno's licenses on file in 2 states: California and Pennsylvania.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
- Pennsylvania license
Emergency medicine physicians near Dr. Nazareno
Counts of emergency medicine physicians 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 Roy Nazareno billed Medicare for 204 services in 2024
CMS data shows 204 Medicare services from Dr. Nazareno across 3 procedure codes in 2024, all of them office visits, for 220 Medicare patients. Medicare paid $24,069 for them. Every service was in an office.
Dr. Nazareno's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2882024: 20429%
Dr. Nazareno compared with the California median for emergency medicine physicians, 2024
- Dr. Nazareno
- California median
- Medicare services
- 204vs 26523% below
- Medicare patients
- 220vs 2439% below
- Part D claims
- 158vs 622.5 times
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Nazareno'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. Gerald Roy Nazareno treated 220 Medicare patients in 2024, average age 75
CMS counts 220 Medicare patients who saw Dr. Nazareno in 2024. The largest group is 75 to 84, with 83 patients. 75% of them have high cholesterol, and 70% have high blood pressure. 20% are also on Medicaid. Their average risk score is 1.14, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Nazareno's median patient age at 38, with 55% women.
Dr. Nazareno's Medicare patients by age, 2024
Dr. Nazareno's Medicare patients by sex, 2024
- Women13360%
- Men8740%
Chronic conditions among Dr. Nazareno's Medicare patients, 2024
- High cholesterol75%
- High blood pressure70%
- Arthritis42%
- Ischemic heart disease27%
- Diabetes26%
- Chronic kidney disease24%
- Mood disorders24%
- Depression23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Nazareno's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 38
Patient panel by sex, all payers
- Women55%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gerald Roy Nazareno wrote 266 Medicare Part D claims in 2024
In 2024, Dr. Nazareno wrote 266 Medicare Part D claims for 183 patients. 92% of them were for generic drugs. CMS names the drug for 158 of them, across 8 drugs with 11 or more claims each, at $1,179 in total drug cost. In 2023, CMS named 202 claims across 10 drugs.
Dr. Nazareno's Part D claims by kind of drug, 2024
- Generic246 claims92%
- Brand-name and other20 claims8%
Dr. Nazareno'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. Nazareno's Part D claims, 2024
- Opioids12%33 of 266 claims
- Antibiotics42%113 of 266 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: 2022024: 15822%
Drugs named by CMS: 8 in 2024, 10 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. Gerald Roy Nazareno scored 83 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 83 out of 100 for Dr. Nazareno for performance year 2024, reported as part of a group. Dr. Nazareno accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Nazareno's MIPS scores, performance year 2024
- 83of 100Final score
- 57.1of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 74of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Gerald Roy Nazareno received $24 in industry payments in 2016
CMS Open Payments shows 1 general payment to Dr. Nazareno from 1 drug or device company in 2016. Food and beverage make up the largest share, 100% of the total. GlaxoSmithKline, LLC. paid the most, $24.
Companies that paid Dr. Nazareno the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gerald Roy Nazareno accepts plans from 3 insurance carriers
Dr. Nazareno is in network with 3 carriers, including Excellus BlueCross BlueShield, CMS Medicare and RI State Medicaid. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Excellus BlueCross BlueShield
- CMS Medicare
- RI State Medicaid
Plan types Dr. Nazareno accepts, by number of carriers
- EPO1
- Medicaid1
- Medicare1
- PPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Gerald Roy Nazareno'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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Gerald Roy Nazareno
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 Roy Nazareno's NPI number?
Dr. Gerald Roy Nazareno's NPI number is 1679564983. It was assigned on November 4, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Gerald Roy Nazareno?
Dr. Gerald Roy Nazareno is an emergency medicine physician in Pleasanton, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Gerald Roy Nazareno practice?
Dr. Nazareno practices at 5555 West Las Positas Boulevard, Pleasanton, CA 94588. Dr. Nazareno's primary practice is Stanford Health Care Tri-Valley in Pleasanton, California, part of Stanford University.
What is Dr. Gerald Roy Nazareno's office phone number?
The practice phone on file for Dr. Nazareno is (925) 847-3000.
What is Dr. Gerald Roy Nazareno's medical license number?
Dr. Nazareno holds California license A53590, one of the licenses on file in 2 states.
Which states has Dr. Gerald Roy Nazareno been licensed in?
Dmand AI has state licenses on file for Dr. Nazareno in California (1994 to 2026) and Pennsylvania (1993 to 1996).
Which hospitals is Dr. Gerald Roy Nazareno affiliated with?
Dr. Nazareno practices at Stanford Health Care Tri-Valley in Pleasanton, California.
What medical group is Dr. Gerald Roy Nazareno part of?
Dr. Nazareno is linked to Pleasanton Emergency Medical Group.
Does Dr. Gerald Roy Nazareno accept Medicare?
Yes. CMS data shows Dr. Nazareno billed Medicare for 204 services in 2024, and Dr. Nazareno accepts Medicare assignment.
What is Dr. Gerald Roy Nazareno's MIPS score?
Dr. Nazareno's MIPS final score for performance year 2024 is 83 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Gerald Roy Nazareno see?
CMS counts 220 Medicare patients who saw Dr. Nazareno in 2024, with an average age of 75.
What services does Dr. Gerald Roy Nazareno bill to Medicare?
In 2024, Dr. Nazareno's most billed Medicare services were office visit, established patient (99214), office visit, new patient (99204) and office visit, established patient (99213).
What drugs does Dr. Gerald Roy Nazareno prescribe most?
In 2024 Medicare Part D data, Dr. Nazareno's most prescribed drugs by claims were Cefadroxil, Tramadol HCl and Methylprednisolone.
Has Dr. Gerald Roy Nazareno received payments from drug or device companies?
CMS Open Payments shows $24 in general payments to Dr. Nazareno from 1 company from 2016 to 2016. The largest total came from GlaxoSmithKline, LLC.
How long has Dr. Gerald Roy Nazareno been practicing?
Dr. Nazareno graduated from medical school in 1987, 39 years ago.
What insurance does Dr. Gerald Roy Nazareno accept?
Dr. Nazareno is in network with 3 carriers, including Excellus BlueCross BlueShield, CMS Medicare and RI State Medicaid. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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