Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Ralph S Guercio, DDS

Dentist in Merrimack, NH · enumerated 2007.

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

National Provider Identifier

1205979549

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Registry record

Entity type Individual (Type 1)

Name Dr. Ralph S Guercio

Credential DDS

Sex Male

Practice address 382 Daniel Webster Highway, Merrimack, NH, 03049

Phone (603) 424-6131

Fax (603) 424-3620

Enumeration date Feb 15, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

122300000X Dentist Dental Providers · License NH1517 (NH) Primary

122300000X Dentist Dental Providers · License 13303 (MA) Secondary

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Ralph Guercio practice?

The practice location on file with NPPES is in Merrimack, NH. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Ralph Guercio?

The National Provider Identifier (NPI) for Ralph Guercio is 1205979549, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.