Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Vanderveer Probasco, M.D., M.S.

Orthopaedic Foot and Ankle Surgery Physician in Fairfield, CT · enumerated 2016.

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

National Provider Identifier

1336503382

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Registry record

Entity type Individual (Type 1)

Name Dr. William Vanderveer Probasco

Credential M.D., M.S.

Sex Male

Practice address 305 Black Rock Tpke, Fairfield, CT, 06825

Phone (203) 337-2600

Fax (203) 337-2611

Enumeration date Apr 6, 2016

Last updated in NPPES Oct 3, 2022

Taxonomy & licenses

207XX0004X Orthopaedic Foot and Ankle Surgery Physician Allopathic & Osteopathic Physicians · License D91392 (MD) Secondary

207XX0004X Orthopaedic Foot and Ankle Surgery Physician Allopathic & Osteopathic Physicians · License 69667 (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.

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Frequently asked questions

How do I verify William Probasco's NPI record?

Cross-check NPI 1336503382 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1336503382 active?

Yes, as of the latest NPPES snapshot, NPI 1336503382 is active (record last updated 2022-10-03).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-10-03.