Dr. William Grass, DDS

Dr. William Grass is a General Practice Dentistry provider (Dentist) practicing in Amherst, MA, registered in the NPPES registry with NPI 1124196225 since 2006. The credential DDS stands for Doctor of Dental Surgery.

✓ Active NPI ✓ Valid NPI checksum

NPI	1124196225
Entity type	Individual (Type 1)
Name	Dr. William Grass
Credential	DDS
Sex	Male
Practice address	31 HALL DR # B, Amherst, MA, 01002
Phone	4132539505
Fax	4132563188
Enumeration date	2006-11-30
Last updated in NPPES	2013-01-24

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
1223G0001X	General Practice Dentistry	Primary	14821	MA

DDS — Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

Copy-ready billing details

Provider: William Grass, DDS
NPI: 1124196225
Taxonomy: 1223G0001X (General Practice Dentistry)
Address: 31 HALL DR # B, Amherst, MA, 01002

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1043382203	Capital Area Hudson Valley Ny Dental	Organization	Dentist	Amherst, MA
1275713547	Nitika Bhatanagar	Individual	General Practice Dentistry	Amherst, MA
1497925010	Solvie Woychuk	Individual	General Practice Dentistry	Amherst, MA
1588905186	Capital Area Hudson Valley Ny Dental PC	Organization	Dentist	Amherst, MA

Verify this record

Cross-check NPI 1124196225 against the authoritative CMS record: view Dr. William Grass on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

Where does William Grass practice?

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

What is the NPI number for William Grass?

The National Provider Identifier (NPI) for William Grass is 1124196225, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2013-01-24.