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Drs. Sherman and O'Brien P.A.

Allergy & Immunology Physician in Baltimore, MD · enumerated 2007 · authorized official Sean O'Brien, President/Physician.

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

National Provider Identifier

1265612535

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Registry record

Entity type Organization (Type 2)
Legal business name Drs. Sherman and O'Brien P.A.
Practice address 6810 Park Heights Ave, Baltimore, MD, 21215
Phone (410) 358-3000
Fax (410) 358-3146
Enumeration date Nov 5, 2007
Last updated in NPPES Nov 5, 2007

Taxonomy & classification

207K00000X Allergy & Immunology Physician Allopathic & Osteopathic Physicians · License D21916 (MD) Primary

Authorized official

Name Sean O'Brien
Title President/Physician
Phone (410) 358-3000

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 type of organization is Drs. Sherman and O'Brien P.A.?
Drs. Sherman and O'Brien P.A. is registered in NPPES as a Allergy & Immunology Physician (its primary provider taxonomy).
What is a Type 2 NPI?
A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-11-05.