Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Samuel Epstein, PHARMD

Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist in Washington, DC · enumerated 2010.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1245561703

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Samuel Epstein

Credential PHARMD

Sex Male

Practice address 2301 M St Nw, Washington, DC, 20037

Phone (202) 419-6367

Enumeration date Jan 22, 2010

Last updated in NPPES Jun 14, 2016

Taxonomy & licenses

1835P0018X Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist Pharmacy Service Providers · License 62919 (CA) Primary

1835P0018X Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist Pharmacy Service Providers · License 19222 (MD) Secondary

1835P0018X Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist Pharmacy Service Providers · License PH100001973 (DC) Secondary

1835P0018X Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist Pharmacy Service Providers · License 0202214060 (VA) Secondary

PHARMD · Doctor of Pharmacy: A licensed pharmacist with a professional doctorate in pharmacy. About the PHARMD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1245561703 active?

Yes, as of the latest NPPES snapshot, NPI 1245561703 is active (record last updated 2016-06-14).

How do I verify Mark Epstein's NPI record?

Cross-check NPI 1245561703 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-06-14.