NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Marc Dinowitz, M.D.

Ophthalmology Physician in Riverhead, NY · enumerated 2006 · practices at Prohealth Care Associates, LLP.

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

National Provider Identifier

1578582466

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Registry record

Entity type Individual (Type 1)
Name Dr. Marc Dinowitz
Credential M.D.
Sex Male
Practice address 937 E Main St, C/O East End Eye A Division of Prohealth Care Associate, Riverhead, NY, 11901
Phone (631) 369-0777
Fax (631) 369-0976
Enumeration date Jul 19, 2006
Last updated in NPPES Dec 14, 2016

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 207586 (NY) 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
02138907 Medicaid NY -
372B61 Other NY EMPIRE BC.BS

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 Marc Dinowitz's NPI record?
Cross-check NPI 1578582466 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1578582466 active?
Yes, as of the latest NPPES snapshot, NPI 1578582466 is active (record last updated 2016-12-14).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-12-14.