Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Marc S Mastropaolo, DO

Internal Medicine Physician in Ypsilanti, MI · enumerated 2006.

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

National Provider Identifier

1982667002

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Registry record

Entity type Individual (Type 1)

Name Dr. Marc S Mastropaolo

Credential DO

Sex Male

Practice address Ypsilanti, MI, 48197

Phone (734) 712-8676

Fax (248) 476-6465

Enumeration date Apr 10, 2006

Last updated in NPPES Sep 13, 2023

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MM009644 (MI) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 5101009644 (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
4691605	Medicaid	MI	-
124168	Other	MI	CARE CHOICES/PREF CHOICES
421561900	Other	MI	TAX ID
1156311905	Other	MI	BCBS

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

What specialty is Marc Mastropaolo?

Marc Mastropaolo is registered in NPPES with the primary taxonomy of Internal Medicine 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 2023-09-13.