Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Nathan Dean Nielsen, M.D.

Critical Care Medicine (Internal Medicine) Physician in Albuquerque, NM · enumerated 2008.

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

National Provider Identifier

1780869743

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Registry record

Entity type Individual (Type 1)

Name Dr. Nathan Dean Nielsen

Credential M.D.

Sex Male

Practice address Msc10-5550 1 University of New Mexico, Albuquerque, NM, 87131

Phone (505) 272-4751

Enumeration date Jan 8, 2008

Last updated in NPPES Sep 26, 2024

Taxonomy & licenses

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License D78283 (MD) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License MD.203214 (LA) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License MD2019-0746 (NM) 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
S062-0559	Other	MD	CAREFIRST BC/BS
1803375	Medicaid	LA	-
931106800	Medicaid	MD	-

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Nathan Nielsen?

Nathan Nielsen is registered in NPPES with the primary taxonomy of Critical Care Medicine (Internal Medicine) Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-09-26.