Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Robert Carter, M.D.

Diagnostic Radiology Physician in Baltimore, MD · enumerated 2005.

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

National Provider Identifier

1912905563

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Registry record

Entity type Individual (Type 1)

Name Dr. William Robert Carter

Credential M.D.

Sex Male

Practice address 22 S Greene St, Dept of Radiology, Baltimore, MD, 21201

Phone (410) 328-3477

Enumeration date Jul 8, 2005

Last updated in NPPES Jul 12, 2019

Taxonomy & licenses

2085P0229X Pediatric Radiology Physician Allopathic & Osteopathic Physicians · License D0051600 (MD) Secondary

2085P0229X Pediatric Radiology Physician Allopathic & Osteopathic Physicians · License MD33346 (DC) Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License D0051600 (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
434211900	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 William Carter?

William Carter is registered in NPPES with the primary taxonomy of Diagnostic Radiology 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 2019-07-12.