DR. NANCY SZENDY MARK D.C.
NPI 1225398860
Chiropractor in Riverhead, NY
About Dr. Nancy Szendy Mark D.c. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NANCY SZENDY MARK D.C. (NPI 1225398860) is an individual chiropractor in Riverhead, New York, licensed in New York (X007378-1) and active in the NPI registry since May 2012. She is a graduate of Life Chiropractic College (1993).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Nancy Szendy Mark D.c. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Nancy Mark reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Riverhead, NY 11901
- Reassigned Medicare billing, New York enrollment
- 2 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Other Providers at the Same Location NPPES 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
RIVERHEAD, NY 11901
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Nancy Mark's NPI number?
The NPI number for Nancy Mark is 1225398860. It was assigned to this individual provider in the NPPES registry on May 16, 2012.
Where is Nancy Mark located?
Nancy Mark practices at 633 Roanoke Ave Pulaski St. (corner), Riverhead, NY 11901. The listed phone number is (631) 727-3795.
What is Nancy Mark's specialty?
The primary specialty registered for this NPI is Chiropractor with taxonomy code 111N00000X.
Is Nancy Mark enrolled in Medicare?
Yes. Nancy Mark is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Nancy Mark's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nancy Mark reassigns Medicare benefits to Hallmark Chiropractic (Riverhead, NY). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Nancy Mark's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nancy Mark accept?
Health plans from Providence Health Plan list Nancy Mark as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Nancy Mark was last updated on March 10, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Nancy Szendy Mark, D.C. · NPI 1225398860
Chiropractor provider in Riverhead, New York. Individual provider, active in the CMS NPPES registry since May 16, 2012.
## Identity
- **NPI:** 1225398860 (Entity type: Individual)
- **Enumerated:** May 16, 2012
- **Primary specialty:** Chiropractor · taxonomy 111N00000X
- **State license:** X007378-1 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 633 ROANOKE AVE, PULASKI ST. (CORNER), Riverhead, NY 11901-2727
- **Phone:** (631) 727-3795
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** Hallmark Chiropractic (NPI 1942248489, Riverhead, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Life Chiropractic College, class of 1993
## Record status
- **NPPES last updated:** March 10, 2020
- **Other identifiers:** Other X007378-1 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1225398860) · Data from the CMS NPPES public registry.