Dr. Nancy Szendy Mark, D.C.

Dr. Nancy Szendy Mark is a Chiropractor provider (Chiropractor) practicing in Riverhead, NY, registered in the NPPES registry with NPI 1225398860 since 2012. The credential DC stands for Doctor of Chiropractic.

✓ Active NPI ✓ Valid NPI checksum

NPI	1225398860
Entity type	Individual (Type 1)
Name	Dr. Nancy Szendy Mark
Credential	D.C.
Sex	Female
Practice address	633 ROANOKE AVE, PULASKI ST. (CORNER), Riverhead, NY, 11901
Phone	6317273795
Enumeration date	2012-05-16
Last updated in NPPES	2020-03-10

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
111N00000X	Chiropractor	Primary	X007378-1	NY

DC — Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential

Other identifiers

Identifier	Type	State	Issuer
X007378-1	Other	NY	LICENSE NUMBER

Copy-ready billing details

Provider: Nancy Mark, D.C.
NPI: 1225398860
Taxonomy: 111N00000X (Chiropractor)
Address: 633 ROANOKE AVE, PULASKI ST. (CORNER), Riverhead, NY, 11901

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1942248489	Hallmark Chiropractic	Organization	Chiropractor	Riverhead, NY
1669415238	Glen Mark	Individual	Chiropractor	Riverhead, NY
1407261811	North Fork Neuropsychology	Organization	Mental Health Clinic/Center (Including Community Mental Health Center)	Riverhead, NY

Verify this record

Cross-check NPI 1225398860 against the authoritative CMS record: view Dr. Nancy Szendy Mark 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 Nancy Mark?

Nancy Mark is registered in NPPES with the primary taxonomy of Chiropractor. 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 2020-03-10.