MARK THOMAS
NPI 1649959487
Nurse Practitioner - Family in Plainview, NY
About Mark Thomas NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK THOMAS (NPI 1649959487) is an individual family provider in Plainview, New York, licensed in New York (F352368-01) and active in the NPI registry since July 2023. He is enrolled in Medicare PECOS, is affiliated with St Catherine Of Siena Hospital Medical Center, and is a graduate of Other (2023).
NPPES Registry Identity
Specialties & Licenses
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
Mark Thomas 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 Reassignments
4Medicare enrollment records show Mark Thomas reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Huntington Station, NY 11746
- Reassigned Medicare billing, New York enrollment
- 4 clinicians in this Medicare group
Farmingdale, NY 11735
- Reassigned Medicare billing, New York enrollment
- 48 clinicians in this Medicare group
West Islip, NY 11795
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Samaritan Medical Services PC
- 209 clinicians in this Medicare group
Bristol, RI 02809
- Reassigned Medicare billing, New York enrollment
- 188 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 4
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Catherine Of Siena Hospital Medical Center
Acute Care Hospitals · Smithtown, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11803 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PLAINVIEW, NY 11803
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 Mark Thomas's NPI number?
The NPI number for Mark Thomas is 1649959487. It was assigned to this individual provider in the NPPES registry on July 17, 2023.
Where is Mark Thomas located?
Mark Thomas practices at 255 Executive Dr Ste 210B, Plainview, NY 11803. The listed phone number is (833) 433-2273.
What is Mark Thomas's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Mark Thomas enrolled in Medicare?
Yes. Mark Thomas 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 organizations bill Medicare for Mark Thomas's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Thomas reassigns Medicare benefits to 4 organizations: Sumaiyah Medical PC (Huntington Station, NY), Kim Medical Of New York PLLC (Farmingdale, NY), Samaritan Medical Services, P.C. (West Islip, NY) and Infinite Medical PC (Bristol, RI). Each 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 Mark Thomas's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mark Thomas affiliated with any hospitals?
According to CMS data, Mark Thomas is affiliated with St Catherine Of Siena Hospital Medical Center.
When was this NPI record last updated?
The NPPES record for Mark Thomas was last updated on May 21, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Mark Thomas · NPI 1649959487
Family physician in Plainview, New York. Individual provider, active in the CMS NPPES registry since July 17, 2023.
## Identity
- **NPI:** 1649959487 (Entity type: Individual)
- **Enumerated:** July 17, 2023
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** F352368-01 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 255 EXECUTIVE DR STE 210B, Plainview, NY 11803-1711
- **Phone:** (833) 433-2273
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Sumaiyah Medical PC (NPI 1508151820, Huntington Station, NY); Kim Medical Of New York PLLC (NPI 1770230039, Farmingdale, NY); Samaritan Medical Services, P.C. (NPI 1124184544, West Islip, NY); Infinite Medical PC (NPI 1407483175, Bristol, RI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2023
## Record status
- **NPPES last updated:** May 21, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1649959487) · Data from the CMS NPPES public registry.