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

Derek K Johnson, MD

Pediatric Allergy/Immunology Physician in Fairfax, VA · enumerated 2005.

Data current as of Jul 11, 2026 · sourced from CMS NPPES

National Provider Identifier

1285622183

Verified

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Registry record

Entity type Individual (Type 1)

Name Derek K Johnson

Credential MD

Sex Male

Practice address Fairfax, VA, 22033

Phone (703) 648-0030

Fax (703) 648-9028

Enumeration date Oct 13, 2005

Last updated in NPPES Feb 27, 2017

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

Taxonomy & licenses

2080P0201X Pediatric Allergy/Immunology Physician Allopathic & Osteopathic Physicians · License MD 065160L (PA) 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
0018751530003	Medicaid	PA	—

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 Derek Johnson practice?

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

What is the NPI number for Derek Johnson?

The National Provider Identifier (NPI) for Derek Johnson is 1285622183, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2017-02-27.