Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark F Kozloff, MD

Q: What is the NPI number for Mark Kozloff?

The National Provider Identifier (NPI) for Mark Kozloff is 1134166879, a Type 1 (individual) record in the CMS NPPES registry.

Hematology & Oncology Physician in Harvey, IL · enumerated 2006.

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

National Provider Identifier

1134166879

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Registry record

Entity type Individual (Type 1)

Name Mark F Kozloff

Credential MD

Sex Male

Practice address 71 W 156th St, Suite 401, Harvey, IL, 60426

Phone (708) 339-4800

Fax (708) 339-3760

Enumeration date Jun 1, 2006

Last updated in NPPES Sep 25, 2018

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 01038049A (IN) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License IL036047581 (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
036047581	Medicaid	IL	-
200016510F	Medicaid	IN	-

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

Where does Mark Kozloff practice?

The practice location on file with NPPES is in Harvey, IL. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Mark Kozloff?

The National Provider Identifier (NPI) for Mark Kozloff is 1134166879, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-09-25.