Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. WILLIAM M NEILSEN DDS
NPI 1558342162
Dentist - General Practice in Clifton Springs, NY

Q: What is William Neilsen's NPI number?

The NPI number for William Neilsen is 1558342162. It was assigned to this individual provider in the NPPES registry on November 10, 2005.

Q: What is William Neilsen's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

Q: When was this NPI record last updated?

The NPPES record for William Neilsen was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 27 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since November 10, 2005

67 KENDALL ST, 120 CLIFTON SPRINGS PROFESSIONAL PARK, CLIFTON SPRINGS, NY 14432(315) 462-5633(315) 462-3196 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

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About Dr. William M Neilsen Dds NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. WILLIAM M NEILSEN DDS (NPI 1558342162) is an individual general practice provider in Clifton Springs, New York, licensed in New York (036016) and active in the NPI registry since November 2005.

NPPES Registry Identity

NPI1558342162

Entity TypeIndividualMale

Primary Taxonomy1223G0001X

Provider Legal NameDR. WILLIAM M NEILSENCredential: DDS

Location Address67 KENDALL ST, 120 CLIFTON SPRINGS PROFESSIONAL PARKClifton Springs, NY 14432-9701

Mailing Address67 Kendall St, 120 Clifton Springs Professional ParkClifton Springs, NY 14432 · (315) 462-5633 · Fax (315) 462-3196

Phone(315) 462-5633

Fax(315) 462-3196

Sole ProprietorNo

Enumeration DateNovember 10, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1558342162 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · General PracticeDental Providers

Taxonomy Code1223G0001X

License✔ Licensed in NY · 036016

Definition

A general dentist is the primary dental care provider for patients of all ages. The general dentist is responsible for the diagnosis, treatment, management and overall coordination of services related to patients' oral health needs.

67 KENDALL ST, Clifton Springs, NY 14432

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Other Identifiers 1

Medicaid00715797NY

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MR. KYLE L MAHONEY OTR/L

Occupational Therapist

67 KENDALL ST, 420 CLIFTON SPRINGS PROFESSIONAL PARK
CLIFTON SPRINGS, NY 14432

Ontario County (315) 462-2569

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Neilsen's NPI number?

The NPI number for William Neilsen is 1558342162. It was assigned to this individual provider in the NPPES registry on November 10, 2005.

Where is William Neilsen located?

William Neilsen practices at 67 Kendall St 120 Clifton Springs Professional Park, Clifton Springs, NY 14432. The listed phone number is (315) 462-5633.

What is William Neilsen's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

When was this NPI record last updated?

The NPPES record for William Neilsen was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 27 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.