Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Mark A. Greenberger, M.D., S.C.

Internal Medicine Physician in Highland Park, IL · enumerated 2006 · authorized official Mark Greenberger, Owner.

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

National Provider Identifier

1437109196

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Registry record

Entity type Organization (Type 2)

Legal business name Mark A. Greenberger, M.D., S.C.

Other name <Unavail>

Practice address 480 Elm Pl, Suite 203, Highland Park, IL, 60035

Phone (847) 433-0404

Fax (847) 433-1389

Enumeration date May 11, 2006

Last updated in NPPES Aug 15, 2011

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 042618739 (IL) Primary

Authorized official

Name Mark Greenberger

Title Owner

Phone (847) 433-0404

Other identifiers

Identifier	Type	State	Issuer
4900615	Other	-	BLUECROSS/BLUESHIELD GOUP

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 is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is Mark A. Greenberger, M.D., S.C.?

Mark A. Greenberger, M.D., S.C. is registered in NPPES as a Internal Medicine Physician (its primary provider taxonomy).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-08-15.