Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Kathryn A. Colby, M.D.

Ophthalmology Physician in New York, NY · enumerated 2005.

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

National Provider Identifier

1245221282

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Registry record

Entity type Individual (Type 1)

Name Dr. Kathryn A. Colby

Credential M.D.

Sex Female

Practice address 222 E 41st St, New York, NY, 10017

Phone (212) 263-2574

Enumeration date Oct 31, 2005

Last updated in NPPES Mar 11, 2021

Taxonomy & licenses

207WX0120X Cornea and External Diseases Specialist Physician Allopathic & Osteopathic Physicians · License 036.138315 (IL) Secondary

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 150411 (MA) 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
3151590	Medicaid	MA	-

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 Kathryn Colby?

The National Provider Identifier (NPI) for Kathryn Colby is 1245221282, a Type 1 (individual) record in the CMS NPPES registry.

Where does Kathryn Colby practice?

The practice location on file with NPPES is in New York, NY. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-11.