Dr. Mark Schaefer, DDS

Dr. Mark Schaefer is a General Practice Dentistry provider (Dentist) practicing in Maspeth, NY, registered in the NPPES registry with NPI 1639251002 since 2006. The credential DDS stands for Doctor of Dental Surgery. Practices at Lauren Ballard Dmd, PC (listed at the same practice address in NPPES).

✓ Active NPI ✓ Valid NPI checksum Sole proprietor

NPI	1639251002
Entity type	Individual (Type 1)
Name	Dr. Mark Schaefer
Credential	DDS
Sex	Male
Practice address	Maspeth, NY, 11378
Phone	7184175383
Enumeration date	2006-10-19
Last updated in NPPES	2007-07-08

Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
1223G0001X	General Practice Dentistry	Primary	035972	NY

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

Copy-ready billing details

Provider: Mark Schaefer, DDS
NPI: 1639251002
Taxonomy: 1223G0001X (General Practice Dentistry)
Address: Maspeth, NY, 11378

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1699854968	Ann Schaefer	Individual	General Practice Dentistry	Maspeth, NY
1497257315	Lauren Ballard	Individual	General Practice Dentistry	Maspeth, NY
1376192690	Lauren Ballard Dmd, PC	Organization	General Practice Dentistry	Maspeth, NY

Verify this record

Cross-check NPI 1639251002 against the authoritative CMS record: view Dr. Mark Schaefer 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

What specialty is Mark Schaefer?

Mark Schaefer is registered in NPPES with the primary taxonomy of General Practice Dentistry. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.