Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Harold Portnoy, M.D.

Specialist in Southfield, MI · enumerated 2005.

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

National Provider Identifier

1699762310

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Registry record

Entity type Individual (Type 1)

Name Harold Portnoy

Credential M.D.

Sex Male

Practice address 29275 Northwestern Hwy, Ste 100, Southfield, MI, 48034

Phone (248) 784-3708

Fax (248) 784-3743

Enumeration date Sep 29, 2005

Last updated in NPPES Jul 9, 2007

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 4301022482 (MI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 Harold Portnoy's NPI record?

Cross-check NPI 1699762310 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1699762310 active?

Yes, as of the latest NPPES snapshot, NPI 1699762310 is active (record last updated 2007-07-09).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.