Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John Tharnstrom, PA

Emergency Medicine Physician in Naperville, IL · enumerated 2006 · practices at Dupage Medical Group Ltd.

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

National Provider Identifier

1467541227

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Registry record

Entity type Individual (Type 1)

Name John Tharnstrom

Credential PA

Sex Male

Practice address 808 Rickert Dr Ste 103, Naperville, IL, 60540

Phone (331) 551-5854

Fax (630) 348-3098

Enumeration date Oct 12, 2006

Last updated in NPPES Jul 28, 2023

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 085-002044 (IL) Primary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA09915 (TX) Secondary

PA · Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program. About the PA 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

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 John Tharnstrom?

John Tharnstrom is registered in NPPES with the primary taxonomy of Emergency Medicine 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 2023-07-28.