Zachary O'Leary, PA-C
NPI 1083298178 · Physician Assistant · Castro Valley, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Zachary O'Leary, PA-C is a Physician Assistant provider in Castro Valley, CA (NPI 1083298178).
Provider details
- NPI number
- 1083298178
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- PA59454 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
5 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
243 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 | 82 | $129 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 60 | $178 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 56 | $92 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 32 | $16 |
| Admn Sarscov2 Vacc 1 Dose90480 | 13 | $52 |
Typical Medicare-allowed amounts for these services range $16–$178 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 94 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 465 | 239 |
| Amlodipine Besylate | 316 | 168 |
| Levothyroxine Sodium | 265 | 128 |
| Losartan Potassium | 237 | 120 |
| Lisinopril | 222 | 119 |
| Metformin Hcl | 162 | 78 |
| Metoprolol Succinate |
Practice location
Mailing address
Additional practice locations (1)
- 5189 Hospital RdMariposa, CA 95338-9524Phone: (907) 891-9941
Registry dates
- Enumerated
- 2021-05-06
- Last updated
- 2023-11-28
- Certified
- 2023-11-28
Frequently asked questions
- What is Zachary O'Leary's NPI number?
- Zachary O'Leary's National Provider Identifier (NPI) is 1083298178, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Zachary O'Leary's specialty?
- Zachary O'Leary is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Zachary O'Leary located?
- Zachary O'Leary's practice location on file with NPPES is 20642 John Dr, Castro Valley, CA 94546-5103.
- What is Zachary O'Leary's phone number?
- The practice phone number listed in the NPPES registry for Zachary O'Leary is (888) 924-1036.
- Does Zachary O'Leary accept Medicare?
- Zachary O'Leary is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Zachary O'Leary's NPI active?
- Yes — Zachary O'Leary's NPI (1083298178) is active in the NPPES registry as of the last update on 2023-11-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.