Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Leonard Joseph Horwitz, MD
Specialist in Cleveland, OH · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1922002575
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Registry record
Entity type Individual (Type 1)
Name Dr. Leonard Joseph Horwitz
Credential MD
Sex Male
Practice address 9500 Euclid Ave, R35, Cleveland, OH, 44195
Phone (216) 445-2030
Fax (216) 445-0470
Enumeration date Jun 10, 2005
Last updated in NPPES Jul 28, 2011
Taxonomy & licenses
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 |
|---|---|---|---|
| 0758130 | Medicaid | OH | - |
| 000000018746 | Other | OH | ANTHEM |
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.
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 Leonard Horwitz?
Leonard Horwitz 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.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-07-28.