Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexandros N Vgontzas, MD

Sleep Medicine (Psychiatry & Neurology) Physician in Hummelstown, PA · enumerated 2006.

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

National Provider Identifier

1578515524

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Registry record

Entity type Individual (Type 1)

Name Alexandros N Vgontzas

Credential MD

Sex Male

Practice address 1214 Research Blvd Ste 1159, Hummelstown, PA, 17036

Phone (717) 531-8520

Fax (717) 531-0678

Enumeration date May 17, 2006

Last updated in NPPES Jan 8, 2018

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License MD040248L (PA) Secondary

2084S0012X Sleep Medicine (Psychiatry & Neurology) Physician Allopathic & Osteopathic Physicians · License MD040248L (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
0011741670001	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

What specialty is Alexandros Vgontzas?

Alexandros Vgontzas is registered in NPPES with the primary taxonomy of Sleep Medicine (Psychiatry & Neurology) Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

Other providers at this practice address

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Kristina Lenker Psychologist · Hummelstown, PA NPI 1295354256

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-01-08.