Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Margaret Reba Stevens Oneill MD, LLC

Dermatology Physician in Chevy Chase, MD · enumerated 2008 · authorized official Margaret Oneill, Medical Doctor.

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

National Provider Identifier

1174793913

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Registry record

Entity type Organization (Type 2)

Legal business name Margaret Reba Stevens Oneill MD, LLC

Practice address 5454 Wisconsin Ave, Suite 1400, Chevy Chase, MD, 20815

Phone (301) 951-7905

Fax (301) 951-7011

Enumeration date Mar 7, 2008

Last updated in NPPES Jan 24, 2012

Taxonomy & classification

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License D0047472 (MD) Primary

Authorized official

Name Margaret Oneill

Title Medical Doctor

Phone (301) 951-7905

Other identifiers

Identifier	Type	State	Issuer
DE4035	Other	-	RAILROAD MEDICARE GROUP#

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

What type of organization is Margaret Reba Stevens Oneill MD, LLC?

Margaret Reba Stevens Oneill MD, LLC is registered in NPPES as a Dermatology 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 2012-01-24.