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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. MARY ELIZABETH NEILL D.D.S., M.S.
NPI 1326045790
Dentist - Periodontics in Washington, DC

Active since June 30, 2005
2311 M ST NW, STE 500, WASHINGTON, DC 20037(202) 296-3360 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Mary Elizabeth Neill D.d.s., M.s. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARY ELIZABETH NEILL D.D.S., M.S. (NPI 1326045790) is an individual periodontics provider in Washington, District Of Columbia, licensed in District Of Columbia (DEN1000086) and active in the NPI registry since June 2005.

NPPES Registry Identity

NPI1326045790
Entity TypeIndividualFemale
Primary Taxonomy1223P0300X
Provider Legal NameDR. MARY ELIZABETH NEILLCredential: D.D.S., M.S.
Location Address2311 M ST NW, STE 500Washington, DC 20037-1495
Mailing Address1701 Woodlore RdAnnapolis, MD 21401-6569 · (301) 233-1297
Phone(202) 296-3360
Sole ProprietorNo
Enumeration DateJune 30, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1326045790 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · PeriodonticsDental Providers
Taxonomy Code1223P0300X
License✔ Licensed in DC · DEN1000086
Definition
That specialty of dentistry which encompasses the prevention, diagnosis and treatment of diseases of the supporting and surrounding tissues of the teeth or their substitutes and the maintenance of the health, function and esthetics of these structures and tissues.
2311 M ST NW, Washington, DC 20037
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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MAJD RAOUF MD
Internal Medicine
2311 M ST NW
WASHINGTON, DC 20037
District of Columbia (202) 296-0034
BRUCE G BONN M.D.
Obstetrics & Gynecology (Gynecology)
2311 M ST NW, SUITE 304
WASHINGTON, DC 20037
District of Columbia (202) 331-0577
TSJ KU PLLC
Clinic/Center (Dental)
2311 M ST NW, SUITE 305
WASHINGTON, DC 20037
District of Columbia (202) 419-7587
ASHLEY WILL L.AC.
Acupuncturist
2311 M ST NW, STE 301
WASHINGTON, DC 20037
District of Columbia (202) 429-3783
MAHMOUD H MUSTAFA, MD, FACP, PC
Internal Medicine
2311 M ST NW, SUITE 401
WASHINGTON, DC 20037
District of Columbia (202) 331-3338
DR. BILAL AHMED
Dentist
2311 M ST NW, SUITE 400
WASHINGTON, DC 20037
District of Columbia (202) 296-5142
DR. CHRISTOPHER MULLANY MCMACKIN MD
Internal Medicine
2311 M ST NW, SUITE 302
WASHINGTON, DC 20037
District of Columbia (202) 296-0043
MRS. ARVELLA BERNADETTE BING CRNA
Nurse Anesthetist, Certified Registered
2311 M ST NW
WASHINGTON, DC 20037
District of Columbia (410) 531-5083

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mary Neill's NPI number?

The NPI number for Mary Neill is 1326045790. It was assigned to this individual provider in the NPPES registry on June 30, 2005.

Where is Mary Neill located?

Mary Neill practices at 2311 M St NW Ste 500, Washington, DC 20037. The listed phone number is (202) 296-3360.

What is Mary Neill's specialty?

The primary specialty registered for this NPI is Dentist, specializing in Periodontics, with taxonomy code 1223P0300X.

When was this NPI record last updated?

The NPPES record for Mary Neill was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 24 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.