Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John J Oppenheimer, MD

Allergy Physician in Cedar Knolls, NJ · enumerated 2005.

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

National Provider Identifier

1639170871

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name John J Oppenheimer

Credential MD

Sex Male

Practice address 8 Saddle Rd, First Floor, Cedar Knolls, NJ, 07927

Phone (908) 934-0555

Fax (973) 540-0472

Enumeration date Aug 10, 2005

Last updated in NPPES May 16, 2016

Taxonomy & licenses

207KA0200X Allergy Physician Allopathic & Osteopathic Physicians · License 25MA05056200 (NJ) Primary

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

Other identifiers

Identifier	Type	State	Issuer
30002942	Other	NJ	RAILROAD MEDICARE
222233003	Other	NJ	HORIZON BC
IS245	Other	NJ	OXFORD INS.
222233003019	Other	NJ	CIGNA INS.
67H422	Other	NJ	EMPIRE HEALTH
121677	Other	NJ	CHN INS.
4263616	Other	NJ	AETNA
5534500	Medicaid	NJ	-

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

Is NPI 1639170871 active?

Yes, as of the latest NPPES snapshot, NPI 1639170871 is active (record last updated 2016-05-16).

How do I verify John Oppenheimer's NPI record?

Cross-check NPI 1639170871 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-05-16.