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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

HAROLD PORTNOY M.D.
NPI 1699762310
Specialist in Southfield, MI

Active since September 29, 2005
29275 NORTHWESTERN HWY, STE 100, SOUTHFIELD, MI 48034(248) 784-3708(248) 784-3743 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About Harold Portnoy M.d. NPPES

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

HAROLD PORTNOY M.D. (NPI 1699762310) is an individual specialist in Southfield, Michigan, licensed in Michigan (4301022482) and active in the NPI registry since September 2005.

NPPES Registry Identity

NPI1699762310
Entity TypeIndividualMale
Primary Taxonomy174400000X
Provider Legal NameHAROLD PORTNOYCredential: M.D.
Location Address29275 NORTHWESTERN HWY, STE 100Southfield, MI 48034-1044
Mailing Address29275 Northwestern Hwy, Ste 100Southfield, MI 48034-1044 · (248) 784-3708 · Fax (248) 784-3743
Phone(248) 784-3708
Fax(248) 784-3743
Sole ProprietorNo
Enumeration DateSeptember 29, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1699762310 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers
Taxonomy Code174400000X
License✔ Licensed in MI · 4301022482
Definition
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
29275 NORTHWESTERN HWY, Southfield, MI 48034
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Other Providers at the Same Location NPPES 20

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

DR. MAY M ANTONE MD
Internal Medicine
29275 NORTHWESTERN HWY, SUITE 200
SOUTHFIELD, MI 48034
Oakland County (248) 423-7000
MR. MICHAEL REED ALTENBURG PT
Physical Therapist
29275 NORTHWESTERN HWY, SUITE 150
SOUTHFIELD, MI 48034
Oakland County (248) 351-6300
POLLY ANN LANDGRAF PT
Physical Therapist
29275 NORTHWESTERN HWY, SUITE 150
SOUTHFIELD, MI 48034
Oakland County (248) 351-6300
JUSTIN HUGELIER PA-C
Physician Assistant
29275 NORTHWESTERN HWY, STE 100
SOUTHFIELD, MI 48034
Oakland County (877) 784-3667
MS. TAMMIE LEE BULLY M.D.
Internal Medicine
29275 NORTHWESTERN HWY, SUITE 202
SOUTHFIELD, MI 48034
Oakland County (248) 727-1990
DIANA BURMEISTER PA-C
Clinical Nurse Specialist (Neuroscience)
29275 NORTHWESTERN HWY, STE 100
SOUTHFIELD, MI 48034
Oakland County (877) 784-3667
SHOSHANA DAHLIA RICHELSON AUD
Audiologist
29275 NORTHWESTERN HWY, SUITE 208
SOUTHFIELD, MI 48034
Oakland County (248) 356-7772
DANIEL MICHAEL MD
Neurological Surgery
29275 NORTHWESTERN HWY, STE. 100
SOUTHFIELD, MI 48034
Oakland County (877) 784-3667

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 Harold Portnoy's NPI number?

The NPI number for Harold Portnoy is 1699762310. It was assigned to this individual provider in the NPPES registry on September 29, 2005.

Where is Harold Portnoy located?

Harold Portnoy practices at 29275 Northwestern Hwy Ste 100, Southfield, MI 48034. The listed phone number is (248) 784-3708.

What is Harold Portnoy's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

When was this NPI record last updated?

The NPPES record for Harold Portnoy was last updated on July 13, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.