Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Frederick A Grassin, D.O.

Q: What type of organization is Frederick A Grassin, D.O.?

Frederick A Grassin, D.O. is registered in NPPES as a Family Medicine Physician (its primary provider taxonomy).

Family Medicine Physician in New Port Richey, FL · enumerated 2008 · authorized official Frederick Grassin, Owner.

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

National Provider Identifier

1770753790

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Registry record

Entity type Organization (Type 2)

Legal business name Frederick A Grassin, D.O.

Practice address 5901 Main St, New Port Richey, FL, 34652

Phone (727) 849-5445

Fax (727) 842-6863

Enumeration date Mar 5, 2008

Last updated in NPPES Mar 5, 2008

Taxonomy & classification

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License OS1108 (FL) Primary

Authorized official

Name Frederick Grassin

Title Owner

Phone (727) 849-5445

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 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.

What type of organization is Frederick A Grassin, D.O.?

Frederick A Grassin, D.O. is registered in NPPES as a Family Medicine Physician (its primary provider taxonomy).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-03-05.