Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Henry Rossy IV, M.D.

Orthopaedic Surgery Physician in Princeton, NJ · enumerated 2010.

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

National Provider Identifier

1891012183

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Registry record

Entity type Individual (Type 1)

Name Dr. William Henry Rossy IV

Credential M.D.

Sex Male

Practice address 325 Princeton Avenue, Princeton, NJ, 08540

Phone (609) 924-8131

Fax (609) 924-8532

Enumeration date Apr 26, 2010

Last updated in NPPES Oct 1, 2019

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 275857 (NY) Secondary

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 25MA09847900 (NJ) 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

Where does William Rossy practice?

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

What is the NPI number for William Rossy?

The National Provider Identifier (NPI) for William Rossy is 1891012183, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-10-01.