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David S. Irwin, M.D.,P.A.

Geriatric Psychiatry Physician in Gaithersburg, MD · enumerated 2014 · authorized official Julie Jaster, Office Manager.

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

National Provider Identifier

1366866808

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Registry record

Entity type Organization (Type 2)
Legal business name David S. Irwin, M.D.,P.A.
Other name <Unavail>
Practice address 16220 Frederick Rd, Suite 308, Gaithersburg, MD, 20877
Phone (301) 840-1077
Fax (301) 948-6199
Enumeration date Feb 4, 2014
Last updated in NPPES Feb 4, 2014

Taxonomy & classification

2084P0805X Geriatric Psychiatry Physician Allopathic & Osteopathic Physicians · License D0001714 (MD) Primary

Authorized official

Name Julie Jaster
Title Office Manager
Phone (301) 840-1077

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 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.
What type of organization is David S. Irwin, M.D.,P.A.?
David S. Irwin, M.D.,P.A. is registered in NPPES as a Geriatric Psychiatry Physician (its primary provider taxonomy).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-02-04.