Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Harold Margolis, DO

Hematology & Oncology Physician in Madison Heights, MI · enumerated 2005.

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

National Provider Identifier

1104800986

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Registry record

Entity type Individual (Type 1)

Name Dr. Harold Margolis

Credential DO

Sex Male

Practice address 27301 Dequindre Rd, Ste 314, Madison Heights, MI, 48071

Phone (248) 399-4400

Fax (248) 399-4840

Enumeration date Dec 5, 2005

Last updated in NPPES Mar 25, 2011

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 5101005779 (MI) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
4385488-11	Medicaid	MI	-

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Harold Margolis?

Harold Margolis is registered in NPPES with the primary taxonomy of Hematology & Oncology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-03-25.