Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Katherine Virginia Day, M.D.

Otolaryngology Physician in Bel Air, MD · enumerated 2006.

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

National Provider Identifier

1598836801

Verified

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Registry record

Entity type Individual (Type 1)

Name Dr. Katherine Virginia Day

Credential M.D.

Sex Female

Practice address 520 Upper Chesapeake Dr, Suite 206, Bel Air, MD, 21014

Phone (410) 879-9100

Fax (410) 879-0227

Enumeration date Nov 10, 2006

Last updated in NPPES Mar 25, 2015

Taxonomy & licenses

207Y00000X Otolaryngology Physician Allopathic & Osteopathic Physicians · License D0058518 (MD) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
279640	Other	MD	MAMSI
684891	Other	MD	NCPP
405062200	Medicaid	MD	-
61614701	Other	MD	CAREFIRST
684891	Other	MD	NCAS
104967	Other	MD	EHP
E5130008	Other	DC	CAREFIRST BLUECHOICE
P00065349	Other	MD	RAILROAD MEDICARE
225153	Other	MD	KAISER

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

Where does Katherine Day practice?

The practice location on file with NPPES is in Bel Air, MD. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Katherine Day?

The National Provider Identifier (NPI) for Katherine Day is 1598836801, a Type 1 (individual) record in the CMS NPPES registry.

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Scott Steinmetz Surgery Physician · Bel Air, MD NPI 1780687996 Elie Fraiji Surgery Physician · Bel Air, MD NPI 1669475869 Jay Lang Cardiovascular Disease Physician · Bel Air, MD NPI 1659374932 Lester Leung Cardiovascular Disease Physician · Bel Air, MD NPI 1851394126 Ann Osman Internal Medicine Physician · Bel Air, MD NPI 1184629784 Sherif Osman Internal Medicine Physician · Bel Air, MD NPI 1245235852 Geoffrey Bloomfield Surgery Physician · Bel Air, MD NPI 1679570410 Hyung Lim Nephrology Physician · Bel Air, MD NPI 1760480164

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-03-25.