Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Nereida Diaz-Johnson, M.D.

Internal Medicine Physician in Union, NJ · enumerated 2006.

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

National Provider Identifier

1013939917

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Registry record

Entity type Individual (Type 1)

Name Dr. Nereida Diaz-Johnson

Credential M.D.

Sex Female

Practice address 2401 Morris Ave, Union, NJ, 07083

Phone (908) 688-5000

Fax (908) 688-5220

Enumeration date Jul 23, 2006

Last updated in NPPES Mar 31, 2010

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MA49304 (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
0256404	Medicaid	NJ	-
571147408	Other	NJ	EMPLOYER IDENTIFIER NUMBER/TAX IDENTIFICATION NUMBER

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 Nereida Diaz-Johnson?

Nereida Diaz-Johnson is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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Walead Latif Nephrology Physician · Union, NJ NPI 1891738555 Ingrid Brown Pediatrics Physician · Union, NJ NPI 1881629061 Clark Philogene Internal Medicine Physician · Union, NJ NPI 1558462044 Paul Lehrhaupt General Practice Dentistry · Union, NJ NPI 1942394762 Anna Chernyak Internal Medicine Physician · Union, NJ NPI 1558437665 Arkadiy Chernyak Psychiatry Physician · Union, NJ NPI 1780733147 Arkadiy Chernyak, MD LLC Psychiatry Physician · Union, NJ NPI 1043580756 Anna Chernyak, MD LLC Primary Care Clinic/Center · Union, NJ NPI 1275973372

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-03-31.