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

DR. WILLIAM HOWARD HILFER MD
NPI 1194712398
Internal Medicine in Rego Park, NY

Active since October 03, 2005
6404 99TH ST, REGO PARK, NY 11374(718) 459-4619(718) 459-4753 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. William Howard Hilfer Md NPPES

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

DR. WILLIAM HOWARD HILFER MD (NPI 1194712398) is an individual internal medicine provider in Rego Park, New York, licensed in New York (136183) and active in the NPI registry since October 2005.

NPPES Registry Identity

NPI1194712398
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. WILLIAM HOWARD HILFERCredential: MD
Location Address6404 99TH STRego Park, NY 11374-2648
Mailing Address6404 99th StRego Park, NY 11374-2648 · (718) 459-4619 · Fax (718) 459-4753
Phone(718) 459-4619
Fax(718) 459-4753
Sole ProprietorNo
Enumeration DateOctober 3, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1194712398 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in NY · 136183
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
6404 99TH ST, Rego Park, NY 11374
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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 Hilfer's NPI number?

The NPI number for William Hilfer is 1194712398. It was assigned to this individual provider in the NPPES registry on October 3, 2005.

Where is William Hilfer located?

William Hilfer practices at 6404 99th St, Rego Park, NY 11374. The listed phone number is (718) 459-4619.

What is William Hilfer's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

When was this NPI record last updated?

The NPPES record for William Hilfer 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 32 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.