Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Marc J Horwitz M D Incorporated

Q: What is the NPI number for Marc J Horwitz M D Incorporated?

The NPI for Marc J Horwitz M D Incorporated is 1578541132, a Type 2 (organization) record in the CMS NPPES registry.

Psychiatry Physician in Pepper Pike, OH · enumerated 2006 · authorized official Marc Horwitz, President.

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

National Provider Identifier

1578541132

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Registry record

Entity type Organization (Type 2)

Legal business name Marc J Horwitz M D Incorporated

Practice address 28250 N Woodland Rd, Pepper Pike, OH, 44124

Phone (216) 831-4300

Enumeration date Jan 4, 2006

Last updated in NPPES May 6, 2010

Taxonomy & classification

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Marc Horwitz

Title President

Phone (216) 831-4300

Other identifiers

Identifier	Type	State	Issuer
0159162	Medicaid	OH	-

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 is the NPI number for Marc J Horwitz M D Incorporated?

The NPI for Marc J Horwitz M D Incorporated is 1578541132, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Marc J Horwitz M D Incorporated?

NPPES lists Marc Horwitz (President) as the authorized official for this organization.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-05-06.