Dr. Marek Niznikiewicz, DDS

Dr. Marek Niznikiewicz is a Oral and Maxillofacial Surgery (Dentist) provider (Dentist) practicing in Harrison, NY, registered in the NPPES registry with NPI 1578684239 since 2007. The credential DDS stands for Doctor of Dental Surgery.

✓ Active NPI ✓ Valid NPI checksum Sole proprietor

NPI	1578684239
Entity type	Individual (Type 1)
Name	Dr. Marek Niznikiewicz
Credential	DDS
Sex	Male
Practice address	Harrison, NY, 10528
Phone	5162978390
Enumeration date	2007-04-02
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
1223S0112X	Oral and Maxillofacial Surgery (Dentist)	Primary	049967	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: Marek Niznikiewicz, DDS
NPI: 1578684239
Taxonomy: 1223S0112X (Oral and Maxillofacial Surgery (Dentist))
Address: Harrison, NY, 10528

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1679635031	Stanislaw Niznikiewicz	Individual	Obstetrics & Gynecology Physician	Harrison, NY

Verify this record

Cross-check NPI 1578684239 against the authoritative CMS record: view Dr. Marek Niznikiewicz 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

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.

What specialty is Marek Niznikiewicz?

Marek Niznikiewicz is registered in NPPES with the primary taxonomy of Oral and Maxillofacial Surgery (Dentist). The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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