Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Marc S Posner MD PA

Q: What is the NPI number for Marc S Posner MD PA?

The NPI for Marc S Posner MD PA is 1821001942, a Type 2 (organization) record in the CMS NPPES registry.

Medical Specialty Clinic/Center in Baltimore, MD · enumerated 2006 · authorized official Marc Posner, President.

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

National Provider Identifier

1821001942

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Registry record

Entity type Organization (Type 2)

Legal business name Marc S Posner MD PA

Other name <Unavail>

Practice address 1147 S Hanover St, Baltimore, MD, 21230

Phone (410) 752-5425

Fax (443) 320-1581

Enumeration date Aug 14, 2006

Last updated in NPPES Aug 21, 2014

Taxonomy & classification

261QM2500X Medical Specialty Clinic/Center Ambulatory Health Care Facilities Primary

Authorized official

Name Marc Posner

Title President

Phone (410) 752-5425

Other identifiers

Identifier	Type	State	Issuer
977841100	Medicaid	MD	-

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.

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Frequently asked questions

What is the NPI number for Marc S Posner MD PA?

The NPI for Marc S Posner MD PA is 1821001942, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Marc S Posner MD PA?

NPPES lists Marc Posner (President) as the authorized official for this organization.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-08-21.