Gerald Nazareno, MD
NPI 1679564983 · Emergency Medicine Physician · Pleasanton, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gerald Nazareno, MD is a Emergency Medicine Physician provider in Pleasanton, CA (NPI 1679564983).
Provider details
- NPI number
- 1679564983
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- A53590 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
204 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 141 | $162 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 40 | $200 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 23 | $116 |
Typical Medicare-allowed amounts for these services range $116–$200 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cefadroxil | 38 | 38 |
| Tramadol Hcl | 32 | 32 |
| Methylprednisolone | 21 | 21 |
| Azithromycin | 16 | 16 |
| Doxycycline Hyclate | 15 | 14 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 12 | 12 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 12 | 12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-11-04
- Last updated
- 2007-07-08
Frequently asked questions
- What is Gerald Nazareno's NPI number?
- Gerald Nazareno's National Provider Identifier (NPI) is 1679564983, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gerald Nazareno's specialty?
- Gerald Nazareno is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gerald Nazareno located?
- Gerald Nazareno's practice location on file with NPPES is 5555 W Las Positas Blvd, Pleasanton, CA 94588-4000.
- What is Gerald Nazareno's phone number?
- The practice phone number listed in the NPPES registry for Gerald Nazareno is (209) 342-2300.
- Does Gerald Nazareno accept Medicare?
- Gerald Nazareno is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gerald Nazareno's NPI active?
- Yes — Gerald Nazareno's NPI (1679564983) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.