Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mark D Brennan, M.D.

Q: What is the NPI number for Mark Brennan?

The National Provider Identifier (NPI) for Mark Brennan is 1326081357, a Type 1 (individual) record in the CMS NPPES registry.

Pain Medicine (Anesthesiology) Physician in Camden, NJ · enumerated 2006.

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

National Provider Identifier

1326081357

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Registry record

Entity type Individual (Type 1)

Name Mark D Brennan

Credential M.D.

Sex Male

Practice address Camden, NJ, 08103

Phone (856) 757-3836

Enumeration date Jun 14, 2006

Last updated in NPPES Jan 6, 2025

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207LP2900X Pain Medicine (Anesthesiology) Physician Allopathic & Osteopathic Physicians · License MA064049 (NJ) 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
222041639	Other	NJ	TAX ID
0559797000	Other	NJ	AMERIHEALTH
1063470	Other	NJ	HORIZON NJ HEALTH
050046397	Other	NJ	RAILROAD MEDICARE
6159401	Medicaid	NJ	-
0009928	Other	NJ	AETNA

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 Mark Brennan practice?

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

What is the NPI number for Mark Brennan?

The National Provider Identifier (NPI) for Mark Brennan is 1326081357, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-01-06.