Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark F Sommer, DDS

Q: What is the NPI number for Mark Sommer?

The National Provider Identifier (NPI) for Mark Sommer is 1649279084, a Type 1 (individual) record in the CMS NPPES registry.

General Practice Dentistry in Lake Success, NY · enumerated 2005.

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

National Provider Identifier

1649279084

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark F Sommer

Credential DDS

Sex Male

Practice address 2001 Marcus Ave, Suite W82, Lake Success, NY, 11042

Phone (516) 328-1144

Fax (516) 328-1147

Enumeration date Jul 19, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 36694 (NY) Primary

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

What is the NPI number for Mark Sommer?

The National Provider Identifier (NPI) for Mark Sommer is 1649279084, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Sommer practice?

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

Other providers at this practice address

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