Harold Portnoy, M.D.
Specialist · Southfield, MI
Harold Portnoy, M.D. is a specialist with a practice address in Southfield, Michigan, and NPI 1699762310, issued on Sep 29, 2005. Check the license (Michigan 4301022482, as entered in NPPES) with the Michigan board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Harold Portnoy
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- 4301022482 MI
Self-reported in NPPES; status is on the state search - Practice location
- 29275 Northwestern Hwy, Southfield, MI 48034
- Phone
- (248) 784-3708
- Enumerated
- Sep 29, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (248) 784-3743
- Entity
- Type 1 · individual
Also registered at 29275 Northwestern Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Harold Portnoy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Michigan board licenses this profession
Search for license 4301022482Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Specialist providers in Michigan
There are 772 specialist records in Michigan. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
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Common questions
What is Harold Portnoy, M.D.'s NPI number?
Harold Portnoy, M.D.'s National Provider Identifier (NPI) is 1699762310, issued on Sep 29, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Harold Portnoy, M.D. located?
The NPPES record lists a practice address at 29275 Northwestern Hwy, Southfield, MI, 48034. Phone: (248) 784-3708. Providers update this record themselves, so call before visiting.
How can I verify Harold Portnoy, M.D.'s license?
NPPES lists Michigan license number 4301022482, as entered by the provider. Search the Michigan board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.