Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Athanassios Petrotos, M.D.

Surgery Physician in Greenwich, CT · enumerated 2006.

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

National Provider Identifier

1861566002

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Registry record

Entity type Individual (Type 1)

Name Dr. Athanassios Petrotos

Credential M.D.

Sex Male

Practice address 77 Lafayette Pl, Suite 301, Greenwich, CT, 06830

Phone (203) 863-4300

Enumeration date Nov 20, 2006

Last updated in NPPES Aug 29, 2016

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 043286 (CT) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

What specialty is Athanassios Petrotos?

Athanassios Petrotos is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-08-29.