Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Matthew D. Karl, MD

Retina Specialist (Ophthalmology) Physician in East Setauket, NY · enumerated 2015.

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

National Provider Identifier

1154716959

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Registry record

Entity type Individual (Type 1)

Name Matthew D. Karl

Credential MD

Sex Male

Practice address 33 Research Way Ste 13, East Setauket, NY, 11733

Phone (631) 444-0650

Fax (614) 293-4719

Enumeration date Mar 30, 2015

Last updated in NPPES Jan 4, 2023

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 35135581 (OH) Secondary

207WX0107X Retina Specialist (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License 35135581 (OH) Secondary

207WX0107X Retina Specialist (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License 291790 (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
0359260	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

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 Matthew Karl?

Matthew Karl is registered in NPPES with the primary taxonomy of Retina Specialist (Ophthalmology) Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

Benedict Urmaza Ophthalmology Physician · East Setauket, NY NPI 1467430157 Rashmi Verma Neurology Physician · East Setauket, NY NPI 1740529486 Farzan Gorgani Ophthalmology Physician · East Setauket, NY NPI 1497133615 Daniel Cyr Pediatric Ophthalmology and Strabismus Specialist Physician · East Setauket, NY NPI 1871092445 Armando Garcia Ophthalmology Physician · East Setauket, NY NPI 1528621547 Sruthi Kodali Student in an Organized Health Care Education/Training Program · East Setauket, NY NPI 1346093275 Nicholas Fazio Student in an Organized Health Care Education/Training Program · East Setauket, NY NPI 1649073123

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-01-04.