Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Athanasios Konstantinidis, M.D.

Allergy Physician in Chicago, IL · enumerated 2008.

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

National Provider Identifier

1437329794

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Registry record

Entity type Individual (Type 1)

Name Athanasios Konstantinidis

Credential M.D.

Sex Male

Practice address 251 E Huron St, Galter Building, 18th Floor, Chicago, IL, 60611

Phone (312) 695-4000

Fax (312) 695-4141

Enumeration date Mar 3, 2008

Last updated in NPPES Mar 3, 2008

Taxonomy & licenses

207KA0200X Allergy Physician Allopathic & Osteopathic Physicians · License 036-115722 (IL) Primary

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

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 Athanasios Konstantinidis?

Athanasios Konstantinidis is registered in NPPES with the primary taxonomy of Allergy 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-03-03.