Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

F. Thomas Day, M.D., Pllc

Q: What type of organization is F. Thomas Day, M.D., Pllc?

F. Thomas Day, M.D., Pllc is registered in NPPES as a Surgery Physician (its primary provider taxonomy).

Surgery Physician in Charlevoix, MI · enumerated 2006 · authorized official F. Day, Owner.

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

National Provider Identifier

1639102445

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Registry record

Entity type Organization (Type 2)

Legal business name F. Thomas Day, M.D., Pllc

Practice address 12162 Country Club Dr, Charlevoix, MI, 49720

Phone (231) 547-1255

Enumeration date Jul 8, 2006

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 4301043812 (MI) Primary

Authorized official

Name F. Day

Title Owner

Phone (231) 547-1255

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 type of organization is F. Thomas Day, M.D., Pllc?

F. Thomas Day, M.D., Pllc is registered in NPPES as a Surgery Physician (its primary provider taxonomy).

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.