Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark D Gendleman, M.D.

Specialist in Evanston, IL · enumerated 2006.

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

National Provider Identifier

1457339863

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Registry record

Entity type Individual (Type 1)

Name Mark D Gendleman

Credential M.D.

Sex Male

Practice address 2500 Ridge Ave, Suite 103, Evanston, IL, 60201

Phone (847) 475-4556

Fax (847) 475-4565

Enumeration date Jan 5, 2006

Last updated in NPPES Mar 11, 2015

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 036045834 (IL) Primary

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

Other identifiers

Identifier	Type	State	Issuer
036045834	Medicaid	IL	-

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

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.

What specialty is Mark Gendleman?

Mark Gendleman is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-03-11.