Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Catherine Corina Violet Gerontis, M.D.

Ophthalmology Physician in Commack, NY · enumerated 2005.

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

National Provider Identifier

1477553253

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Catherine Corina Violet Gerontis

Credential M.D.

Sex Female

Practice address Commack, NY, 11725

Phone (631) 439-5440

Enumeration date Jul 22, 2005

Last updated in NPPES Apr 20, 2020

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 188154 (NY) Primary

207WX0110X Pediatric Ophthalmology and Strabismus Specialist Physician Allopathic & Osteopathic Physicians · License 188154 (NY) Secondary

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
48Z811	Other	-	BLUE CROSS/CHILD
113547507	Other	-	EMPIRE
113547507	Other	-	GREAT WEST
188154A27	Other	-	HEALTHFIRST
2C8244	Other	-	HEALTH NET
112658697	Other	-	JJ NEW/USI
113547507	Other	-	CIGNA PPO
113547507	Other	-	ISLAND GROUP
2436110	Other	-	AETNA
31160P	Other	-	HIP HEALTH CARE PARTNERS
113547507	Other	-	BEECH TREE
8209571002	Other	-	CIGNA HMO
188154A27	Other	-	HEALTHFIRST CHP
0401751	Other	-	GHI
112658697	Other	-	FIRST HEALTH
27626	Other	-	ANTHEM
GC8154	Other	-	ATLANTIS
31160P	Other	-	HIP

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1477553253 active?

Yes, as of the latest NPPES snapshot, NPI 1477553253 is active (record last updated 2020-04-20).

How do I verify Catherine Gerontis's NPI record?

Cross-check NPI 1477553253 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-04-20.