Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Nancy Szendy Mark, D.C.
Chiropractor in Riverhead, NY · enumerated 2012.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1225398860
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Registry record
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 (631) 727-3795
Enumeration date May 16, 2012
Last updated in NPPES Mar 10, 2020
Taxonomy & licenses
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 |
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.
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.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-03-10.