Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Frederick John Grassin, D.D.S.
Endodontics in New Port Richey, FL · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1831311802
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Registry record
Entity type Individual (Type 1)
Name Frederick John Grassin
Credential D.D.S.
Sex Male
Practice address 5347 Main Street, Suite 301, New Port Richey, FL, 34652
Phone (727) 841-9800
Fax (727) 848-4768
Enumeration date May 2, 2007
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees.
About the DDS 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.
Frequently asked questions
How do I verify Frederick Grassin's NPI record?
Cross-check NPI 1831311802 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1831311802 active?
Yes, as of the latest NPPES snapshot, NPI 1831311802 is active (record last updated 2007-07-08).
Other providers at this practice address
Browse all → F.A. Hauber ,M.D., P.A. Ophthalmology Physician · New Port Richey, FL NPI 1811084783 Neria Hebbar Surgery Physician · New Port Richey, FL NPI 1255420386 Gulf Coast Surgical Group Colon & Rectal Surgery Physician · New Port Richey, FL NPI 1104039148 MD Hearing LLC Hearing Instrument Specialist · New Port Richey, FL NPI 1992096077
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.