Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Michael H Fretzin, MD

Procedural Dermatology Physician in Buffalo Grove, IL · enumerated 2005.

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

National Provider Identifier

1134118987

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Registry record

Entity type Individual (Type 1)

Name Michael H Fretzin

Credential MD

Sex Male

Practice address 600 W Lake Cook Rd, Suite 110, Buffalo Grove, IL, 60089

Phone (847) 459-6611

Fax (847) 459-7929

Enumeration date Oct 14, 2005

Last updated in NPPES Dec 23, 2015

Taxonomy & licenses

207NS0135X Procedural Dermatology Physician Allopathic & Osteopathic Physicians · License 036-102194 (IL) Primary

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License 036102194 (IL) Secondary

207NI0002X Clinical & Laboratory Dermatological Immunology Physician Allopathic & Osteopathic Physicians · License 036102194 (IL) Secondary

207ND0900X Dermatopathology Physician Allopathic & Osteopathic Physicians · License 036102194 (IL) Secondary

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

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

Where does Michael Fretzin practice?

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

What is the NPI number for Michael Fretzin?

The National Provider Identifier (NPI) for Michael Fretzin is 1134118987, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-12-23.