Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gregory C Oliver, M.D.

Colon & Rectal Surgery Physician in Edison, NJ · enumerated 2006 · practices at Associated Colon & Rectal Surgeons, P.A..

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

National Provider Identifier

1386615425

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory C Oliver

Credential M.D.

Sex Male

Practice address 3900 Park Ave, Suite 101, Edison, NJ, 08820

Phone (732) 494-6640

Fax (732) 549-8204

Enumeration date Jan 27, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

208C00000X Colon & Rectal Surgery Physician Allopathic & Osteopathic Physicians · License 25MA04291500 (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
1956507	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.

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Frequently asked questions

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.

What specialty is Gregory Oliver?

Gregory Oliver is registered in NPPES with the primary taxonomy of Colon & Rectal Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.