Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Christopher Zajac, M.D.

Internal Medicine Physician in Baltimore, MD · enumerated 2006 · practices at Potomac Physicians PA.

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

National Provider Identifier

1699708669

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Registry record

Entity type Individual (Type 1)

Name Dr. Christopher Zajac

Credential M.D.

Sex Male

Practice address 9649 Belair Rd, Second Floor, Baltimore, MD, 21236

Phone (410) 256-9340

Fax (410) 529-9465

Enumeration date Jul 9, 2006

Last updated in NPPES Feb 22, 2012

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D0034249 (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
01125	Other	-	JOHNS HOPKINS HEALTHCARE
5920093	Other	-	AETNA PPO
700258	Other	-	NCPPO
9990	Other	-	KAISER
52175502	Other	-	CAREFIRST MARYLAND
110744	Other	-	COVENTRY
1974448	Other	-	UNITED HEALTHCARE
2329081	Other	-	AETNA HMO
281964	Other	-	MAMSI
531591300	Medicaid	MD	-
0034	Other	-	CAREFIRST DC
93480	Medicaid	MD	-
0403483	Medicaid	MD	-
1380505003	Other	-	CIGNA

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

Where does Christopher Zajac practice?

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

What is the NPI number for Christopher Zajac?

The National Provider Identifier (NPI) for Christopher Zajac is 1699708669, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Potomac Physicians PA Family Medicine Physician · Baltimore, MD NPI 1790706844 Dawn Kobrin-Merritts Pediatrics Physician · Baltimore, MD NPI 1184636680 Erin West Professional Counselor · Nottingham, MD NPI 1235444829

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-02-22.