Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark C Downey, MD

Q: What is the NPI number for Mark Downey?

The National Provider Identifier (NPI) for Mark Downey is 1003850744, a Type 1 (individual) record in the CMS NPPES registry.

Pediatrics Physician in Williamsburg, VA · enumerated 2006.

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

National Provider Identifier

1003850744

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Registry record

Entity type Individual (Type 1)

Name Mark C Downey

Credential MD

Sex Male

Practice address 119 Bulifants Blvd, Williamsburg, VA, 23188

Phone (757) 564-7337

Fax (757) 564-3205

Enumeration date Jun 15, 2006

Last updated in NPPES Feb 28, 2013

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 0101231481 (VA) 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
010126088	Other	-	VA PREMIERE HEALTH PLAN
010126088	Medicaid	VA	-
41203	Other	-	SENTARA/OPTIMA
12-02789	Other	-	UNITED HEALTHCARE
54-1778786	Other	-	PHCS
54-1778786	Other	-	CCN
6731745	Other	-	CIGNA
54-1778786	Other	-	FIRST HEALTH/MAIL HANDLER
7557155	Other	-	AETNA TRADITIONAL
54-1778786-032	Other	-	CHAMPUS/TRICARE
2710497	Other	-	AETNA HMO
54-1778786	Other	-	MID ATLANTIC HEALTH SOLUT
249628	Other	-	SOUTHERN HEALTH
8128044	Other	-	MAMSI/MDIPA
153980	Other	-	ANTHEM
54-1778786	Other	-	VA HEALTH NETWORK

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 is the NPI number for Mark Downey?

The National Provider Identifier (NPI) for Mark Downey is 1003850744, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Downey practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-02-28.