Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William S Nelson, MD

Obstetrics & Gynecology Physician in Rye, NY · enumerated 2006.

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

National Provider Identifier

1225006190

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Registry record

Entity type Individual (Type 1)

Name Dr. William S Nelson

Credential MD

Sex Male

Practice address 1 Theall Rd, Rye, NY, 10580

Phone (914) 848-8800

Fax (914) 682-6403

Enumeration date Mar 8, 2006

Last updated in NPPES Oct 16, 2013

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 087054 (NY) Primary

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 012331 (CT) 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
00649005	Medicaid	NY	-

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

How do I verify William Nelson's NPI record?

Cross-check NPI 1225006190 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1225006190 active?

Yes, as of the latest NPPES snapshot, NPI 1225006190 is active (record last updated 2013-10-16).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-10-16.