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Thomas B. Day, M.D.,P.A.

Medical Specialty Clinic/Center in Windsor Mill, MD · enumerated 2007 · authorized official Thomas Day, President.

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

National Provider Identifier

1689727240

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Registry record

Entity type Organization (Type 2)
Legal business name Thomas B. Day, M.D.,P.A.
Practice address 7001 Johnnycake Rd Ste 104, Windsor Mill, MD, 21244
Phone (410) 747-4711
Fax (410) 747-4766
Enumeration date Jan 18, 2007
Last updated in NPPES Mar 7, 2023

Taxonomy & classification

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

Authorized official

Name Thomas Day
Title President
Phone (410) 747-4711

Other identifiers

Identifier Type State Issuer
5433193P0001 Medicaid MD -
M11803 Other MD CONTROL DRUG - MARYLAND

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 Thomas B. Day, M.D.,P.A.?
The NPI for Thomas B. Day, M.D.,P.A. is 1689727240, a Type 2 (organization) record in the CMS NPPES registry.
Who is the authorized official for Thomas B. Day, M.D.,P.A.?
NPPES lists Thomas Day (President) as the authorized official for this organization.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-07.