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

Kristofer Nathaniel Tupper, D.O.

Sports Medicine (Family Medicine) Physician in Fairfield, CT · enumerated 2017.

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

National Provider Identifier

1306378104

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Registry record

Entity type Individual (Type 1)

Name Kristofer Nathaniel Tupper

Credential D.O.

Sex Male

Practice address Fairfield, CT, 06825

Phone (203) 337-2600

Fax (203) 337-2611

Enumeration date Mar 30, 2017

Last updated in NPPES Jan 21, 2022

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

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 69436 (CT) Secondary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License LP04070 (RI) Secondary

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

207QS0010X Sports Medicine (Family Medicine) Physician Allopathic & Osteopathic Physicians · License 69436 (CT) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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 Kristofer Tupper?

Kristofer Tupper is registered in NPPES with the primary taxonomy of Sports Medicine (Family Medicine) 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 2022-01-21.