Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark G Ryan

Optometrist in New Haven, CT · enumerated 2006.

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

National Provider Identifier

1548211220

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Registry record

Entity type Individual (Type 1)

Name Mark G Ryan

Sex Male

Practice address 1457 Whalley Ave, New Haven, CT, 06515

Phone (203) 562-3937

Fax (203) 389-3994

Enumeration date May 15, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 002155 (CT) Primary

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 Mark Ryan's NPI record?

Cross-check NPI 1548211220 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1548211220 active?

Yes, as of the latest NPPES snapshot, NPI 1548211220 is active (record last updated 2007-07-08).

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Opticare Eye Health Centers, Inc. Eyewear Supplier · New Haven, CT NPI 1689625519 Andrew Stack Optometrist · New Haven, CT NPI 1306983648 Wendy Kok Optometrist · New Haven, CT NPI 1376709303 Myeyedr Optometry of Connecticut, LLC Optometrist · New Haven, CT NPI 1902270614 Raymond Farmer Optometrist · New Haven, CT NPI 1447823158 Iva Hoxha Optometrist · New Haven, CT NPI 1396476016

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.