Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

GERALD ROY NAZARENO MD
NPI 1679564983
Emergency Medicine in Pleasanton, CA

Active since November 04, 2005PECOS Enrolled
100/100
CMS Quality Rating
5555 W LAS POSITAS BLVD, PLEASANTON, CA 94588(209) 342-2300(209) 524-4240 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.

About Gerald Roy Nazareno Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GERALD ROY NAZARENO MD (NPI 1679564983) is an individual emergency medicine provider in Pleasanton, California, licensed in California (A53590) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS and is a graduate of Other (1987).

NPPES Registry Identity

NPI1679564983
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameGERALD ROY NAZARENOCredential: MD
Location Address5555 W LAS POSITAS BLVDPleasanton, CA 94588-4000
Mailing Address4301 Northstar WayModesto, CA 95356-9262 · (209) 342-2300 · Fax (209) 524-4240
Fax(209) 524-4240
Sole ProprietorNo
Medical School CMSOtherGraduated 1987
Enumeration DateNovember 4, 2005
Last NPPES UpdateJuly 13, 2026
NPI 1679564983 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License Licensed in CA · A53590
Definition

An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.

5555 W LAS POSITAS BLVD, Pleasanton, CA 94588

Other Identifiers 2

Medicaid00A535900CA
Other00A535900CA · Blue Shield

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

Enrolled in Medicare and accepts Medicare assignment

Gerald Roy Nazareno Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6709774482
PECOS Enrollment IDI20040310000497
Eligible to Order & Refer Part B Labs & Imaging Durable Medical Equipment Home Health Agency Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 3

Services this provider delivered to Medicare fee-for-service patients, from the 2024 & 2026 CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
141 services136 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
40 services40 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
23 services23 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94588 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$104.51 typical visit price
range $69.00 – $202.35
Typical copayment $26.12 (range $17.25 – $50.58)
Most-billed visit code 99203
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

100/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Promoting Interoperability100
Improvement Activities40

Reported Quality Measures

Care Plan
Percentage of patients aged 65 years and older who have an advance care plan or surrogate decision maker documented in the medical record that an advance care plan was discussed but the patient did not wish or was not able to name a surrogate decision maker…
7%191 patients1/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Emergency Medicine
5555 W LAS POSITAS BLVD
PLEASANTON, CA 94588
Emergency Medicine
5555 W LAS POSITAS BLVD
PLEASANTON, CA 94588
Emergency Medicine
5555 W LAS POSITAS BLVD
PLEASANTON, CA 94588
Pediatrics
5555 W LAS POSITAS BLVD
PLEASANTON, CA 94588
Emergency Medicine
5555 W LAS POSITAS BLVD
PLEASANTON, CA 94588
Pharmacist
5555 W LAS POSITAS BLVD, PHARMACY DEPARTMENT
PLEASANTON, CA 94588
Physical Therapist
5555 W LAS POSITAS BLVD
PLEASANTON, CA 94588
Physical Therapist
5555 W LAS POSITAS BLVD
PLEASANTON, CA 94588

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1679564983, enumerated as an "individual" on November 04, 2005.

The provider is located at 5555 W LAS POSITAS BLVD PLEASANTON, CA 94588 and the phone number is (209) 342-2300.

Emergency Medicine with taxonomy code 207P00000X.

The provider might be accepting Accepts: Medicare, Medicaid and Blue Cross Blue Shield. Please consult your insurance carrier or call the provider to verify.