Mary Stephanie Youssef
Pharmacist · Pomona, CA
Mary Stephanie Youssef is a pharmacist with a practice address in Pomona, California, and NPI 1336857663, issued on Nov 7, 2022. Check the license (California 84863, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Stephanie Youssef
- Primary taxonomy
- Pharmacist 183500000X
- License number
- 84863 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1798 N Garey Ave, Pomona, CA 91767
- Phone
- (909) 865-9549
- Enumerated
- Nov 7, 2022
- Record last updated
- Nov 7, 2022
- Entity
- Type 1 · individual
8 nearest pharmacist records → All 32,533 in California → Look up another NPI →
Also registered at 1798 N Garey Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary Stephanie Youssef in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 84863Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average pharmacist in 2024
11 Medicare Part D claims, against an average of 119 among the 28,524 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Mary Stephanie Youssef among 32,533 pharmacist records in California
Mary Stephanie Youssef is one of 32,533 pharmacist records with a practice address in California. 15% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 84% of them.
- NPI issued2022 · 84% of these records are older, 12% newer
- In a Medicare fileYes · 15% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2022 · 76% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 183500000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
100 pharmacist records list a practice address in Pomona
They are 100 of the 5,102 NPPES records with a practice address in Pomona, and 32,533 pharmacist records in California.
All 32,533 in California → Every provider in Pomona → Pharmacist nationwide →
The 8 pharmacist records with the nearest ZIP codes
- Henry Bakhit, RPHPomona, CA 917671922329002
- Eleanor Bicera, PHARMDPomona, CA 917671922385285
- Shannon Breceda, RPHPomona, CA 917671134568280
- Sharon LeePomona, CA 917671467720482
- Lien Ly, PHARM.D.Pomona, CA 917671437427275
- Bhupendra MavaniPomona, CA 917671053605816
- Colleen MuelchiPomona, CA 917671730580788
- Pauline Nguyen, PHARM.D.Pomona, CA 917671639446131
Common questions
What is Mary Stephanie Youssef's NPI number?
Mary Stephanie Youssef's National Provider Identifier (NPI) is 1336857663, issued on Nov 7, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Mary Stephanie Youssef located?
The NPPES record lists a practice address at 1798 N Garey Ave, Pomona, CA, 91767. Phone: (909) 865-9549. Providers update this record themselves, so call before visiting.
How can I verify Mary Stephanie Youssef's license?
NPPES lists California license number 84863, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Mary Stephanie Youssef prescribe under Medicare Part D?
In 2024, Mary Stephanie Youssef had 11 Medicare Part D claims; the average among pharmacist prescribers was 119. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.