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

William C Oppenheim, M.D.

Orthopaedic Surgery Physician in Millburn, NJ · enumerated 2006.

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

National Provider Identifier

1649376310

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Registry record

Entity type Individual (Type 1)

Name William C Oppenheim

Credential M.D.

Sex Male

Practice address Millburn, NJ, 07041

Phone (973) 379-1991

Fax (973) 467-8647

Enumeration date Sep 16, 2006

Last updated in NPPES May 12, 2016

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

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License MA2618 (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.

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Frequently asked questions

How do I verify William Oppenheim's NPI record?

Cross-check NPI 1649376310 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1649376310 active?

Yes, as of the latest NPPES snapshot, NPI 1649376310 is active (record last updated 2016-05-12).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-05-12.