Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Fellows Weems, M.D.

Neonatal-Perinatal Medicine Physician in Memphis, TN · enumerated 2009.

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

National Provider Identifier

1477793362

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Fellows Weems

Credential M.D.

Sex Male

Practice address 853 Jefferson Ave, Rout Bldg E201, Memphis, TN, 38103

Phone (901) 448-5950

Enumeration date Mar 4, 2009

Last updated in NPPES Feb 25, 2025

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License A106872 (CA) Secondary

2080N0001X Neonatal-Perinatal Medicine Physician Allopathic & Osteopathic Physicians · License A106872 (CA) Secondary

2080N0001X Neonatal-Perinatal Medicine Physician Allopathic & Osteopathic Physicians · License 50174 (TN) 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
04328790	Medicaid	MS	-
198061001	Medicaid	AR	-
1533405	Medicaid	TN	-

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

What specialty is Mark Weems?

Mark Weems is registered in NPPES with the primary taxonomy of Neonatal-Perinatal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-25.