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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Steven M Horowitz, M.D.

Cardiovascular Disease Physician in Glastonbury, CT · enumerated 2005 · practices at Hartford Hospital.

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

National Provider Identifier

1558358598

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Registry record

Entity type Individual (Type 1)
Name Steven M Horowitz
Credential M.D.
Sex Male
Practice address 703 Hebron Ave, Suite 805, Glastonbury, CT, 06033
Phone (860) 659-8830
Fax (860) 633-8529
Enumeration date Oct 4, 2005
Last updated in NPPES Jun 5, 2014

Taxonomy & licenses

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 023326 (CT) 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
001233261 Medicaid CT -

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

How do I verify Steven Horowitz's NPI record?
Cross-check NPI 1558358598 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1558358598 active?
Yes, as of the latest NPPES snapshot, NPI 1558358598 is active (record last updated 2014-06-05).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-06-05.