William Isenstein, R.PH.
Pharmacist · Gaithersburg, MD
William Isenstein, R.PH. is a pharmacist with a practice address in Gaithersburg, Maryland, and NPI 1114201985, issued on Sep 28, 2011. Check the license (Maryland 09704, as entered in NPPES) with the Maryland board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- William Isenstein
- Credential
- R.PH.
- Primary taxonomy
- Pharmacist 183500000X
- License number
- 09704 MD
Self-reported in NPPES; status is on the state search - Practice location
- 880 Russell Ave, Gaithersburg, MD 20879
- Phone
- (301) 556-1960
- Enumerated
- Sep 28, 2011
- Record last updated
- Sep 28, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (301) 556-1967
- Entity
- Type 1 · individual
8 nearest pharmacist records → All 5,562 in Maryland → Look up another NPI →
Also registered at 880 Russell Ave
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Verify William Isenstein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license 09704Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
William Isenstein among 5,562 pharmacist records in Maryland
William Isenstein, R.PH. is one of 5,562 pharmacist records with a practice address in Maryland. 10% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2011, is newer than 20% of them.
- NPI issued2011 · 20% of these records are older, 72% newer
- In a Medicare fileNo · 10% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2011 · 78% 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 Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
104 pharmacist records list a practice address in Gaithersburg
They are 104 of the 2,580 NPPES records with a practice address in Gaithersburg, and 5,562 pharmacist records in Maryland. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 5,562 in Maryland → Every provider in Gaithersburg → Pharmacist nationwide →
The 8 pharmacist records with the nearest ZIP codes
- Jack Bilby, P.D.Gaithersburg, MD 208791568762532
- Michele Bonistalli, RPHGaithersburg, MD 208791780027680
- Heather Buehler, PHARMDGaithersburg, MD 208791952643868
- Chandra Chaurasia, PH.D, R.PH.Gaithersburg, MD 208791457796401
- Genevieve DangGaithersburg, MD 208791548560618
- Gretchen Kendall, PHARMDGaithersburg, MD 208791063755957
- Ji Lee, PHARMACISTGaithersburg, MD 208791396045605
- Melissa McGowan, RPHGaithersburg, MD 208791750623567
Common questions
What is William Isenstein, R.PH.'s NPI number?
William Isenstein, R.PH.'s National Provider Identifier (NPI) is 1114201985, issued on Sep 28, 2011. An NPI identifies a provider in billing; it is not a license.
Where is William Isenstein, R.PH. located?
The NPPES record lists a practice address at 880 Russell Ave, Gaithersburg, MD, 20879. Phone: (301) 556-1960. Providers update this record themselves, so call before visiting.
How can I verify William Isenstein, R.PH.'s license?
NPPES lists Maryland license number 09704, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity 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. 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.