Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William S Gilbert, M.D.

Ophthalmology Physician in Chevy Chase, MD · enumerated 2006.

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

National Provider Identifier

1639143993

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Registry record

Entity type Individual (Type 1)

Name Dr. William S Gilbert

Credential M.D.

Sex Male

Practice address 5454 Wisconsin Ave, Suite # 1540, Chevy Chase, MD, 20815

Phone (301) 656-8100

Fax (301) 652-2957

Enumeration date Feb 14, 2006

Last updated in NPPES May 5, 2010

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License D0004150 (MD) Primary

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 0101018821 (VA) Secondary

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License MD3618 (DC) Secondary

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
245931100	Medicaid	MD	-
006307035	Medicaid	VA	-
024741300	Medicaid	DC	-

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

Where does William Gilbert practice?

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

What is the NPI number for William Gilbert?

The National Provider Identifier (NPI) for William Gilbert is 1639143993, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-05-05.