Zachary Gerard O'Leary, PA-C
Zachary Gerard O'Leary is a Physician Assistant based in Castro Valley, CA with over 5 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Zachary Gerard O'Leary, PA-C practices as part of a group physician assistant practice in Castro Valley, CA. He completed training at Stanford University School of Medicine in 2021 and is early in his career. A physician assistant is a person who has successfully completed an accredited education program for physician assistant. CMS MIPS quality score: 94.91/100 (2023).
At a glance
- Prescribes opioids less than 46% of reporting doctors in California
- Uses generic medications more than 36% of reporting doctors in California
- Federal MIPS score higher than 80% of MIPS-scored doctors in California
- Virtual visits available — no app or travel required
Older · 908dNPPES updated 2023-11-28 · verify NPI on CMS · Verify license at Medical Board of California
How Does This Doctor Compare?
Based on Medicare data, this doctor scores better than 80% of doctors in California on federal quality measures, prescribes opioid pain medications conservatively, favors affordable generic drugs over brand-name ones.
MIPS Score
202394.91/100
California avg: 78.6 · US avg: 83.6
✓ Higher than most doctors nationally(+11.3 pts)
Better than 80% of MIPS-scored doctors in CaliforniaHow the government rates this doctor's Medicare care quality. Scores above 75 are considered good.
Opioid Rx
↓ Lower = better1.26%
California avg: 5.2 · US avg: 5.1
✓ Higher than most doctors nationally(-3.8 pts)
Typical range among reporting doctors in California1.26% of this doctor's prescriptions are opioid pain medications. Lower means more cautious prescribing.
Generic Rx
↑ Higher = better84.7%
California avg: 83.3 · US avg: 82.8
✓ Higher than most doctors nationally(+1.9 pts)
How often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Prescription Recipients
465
Patients prescribed
Prescriptions Written
1,904
Total claims
Total Medicare drug cost: $289k
Percentile rankings compared against 9,360 reporting peers in California.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 2021
Stanford University School of Medicine
Board certified · Nov 27, 2023
Self-reported via NPPES
5 years in practice
Established
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Taxonomy: 363A00000X
Education & Training
Stanford University School of Medicine (Class of 2021)
Primary hospital affiliation: Psychiatric
CMS Certification Number: 194022
View hospital on Medicare Care CompareVirtual Medical Care With Zachary Gerard O'Leary
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Zachary Gerard O'Leary for follow-ups, medication reviews, and ongoing care — no travel to Castro Valley required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Zachary Gerard O'Leary
NPI records show Dr. O'Leary as active with telehealth listed in Castro Valley, CA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (888) 924-1036.
Sourced from CMS NPPES · OIG LEIE · CMS QPP 2023 · CMS Medicare Part D. See Data Methodology.
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Contact Zachary Gerard O'Leary
Practice Location
20642 John Dr, Castro Valley, CA 94546-5103
Mailing Address
20642 John Dr, Castro Valley, CA 94546-5103
This is a provider directory. Contact the office directly to schedule appointments.
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