DR. MARK G. SINCLAIR M.D.
NPI 1275827123
Family Medicine in New York, NY
About Dr. Mark G. Sinclair M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK G. SINCLAIR M.D. (NPI 1275827123) is an individual family medicine provider in New York, New York, licensed in New York (283283) and active in the NPI registry since June 2011. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Mark G. Sinclair M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Mark Sinclair reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10003
- Reassigned Medicare billing, New York enrollment
- 346 clinicians in this Medicare group
New York, NY 10029
- Reassigned Medicare billing, New York enrollment
- 385 clinicians in this Medicare group
New York, NY 10037
- Reassigned Medicare billing, New York enrollment
- 2,094 clinicians in this Medicare group
Bronx, NY 10451
- Reassigned Medicare billing, New York enrollment
- 971 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10003 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
NEW YORK, NY 10003
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 Sinclair's NPI number?
The NPI number for Mark Sinclair is 1275827123. It was assigned to this individual provider in the NPPES registry on June 7, 2011.
Where is Mark Sinclair located?
Mark Sinclair practices at 16 E 16th St, New York, NY 10003. The listed phone number is (954) 662-9668.
What is Mark Sinclair's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Mark Sinclair enrolled in Medicare?
Yes. Mark Sinclair is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Mark Sinclair's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Sinclair reassigns Medicare benefits to 4 organizations: Icahn School Of Medicine At Mount Sinai (New York, NY), Icahn School Of Medicine At Mount Sinai (New York, NY), Physician Affiliate Group Of New York PC (New York, NY) and Downtown Bronx Medical Associates PC (Bronx, NY). 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 Sinclair's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mark Sinclair was last updated on May 12, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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. Mark G. Sinclair, M.D. · NPI 1275827123
Family Medicine physician in New York, New York. Individual provider, active in the CMS NPPES registry since June 7, 2011.
## Identity
- **NPI:** 1275827123 (Entity type: Individual)
- **Enumerated:** June 7, 2011
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 283283 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 16 E 16TH ST, New York, NY 10003-3105
- **Phone:** (954) 662-9668
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **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): Icahn School Of Medicine At Mount Sinai (NPI 1013386812, New York, NY); Icahn School Of Medicine At Mount Sinai (NPI 1033482518, New York, NY); Physician Affiliate Group Of New York PC (NPI 1013375526, New York, NY); Downtown Bronx Medical Associates PC (NPI 1689618407, Bronx, NY) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** May 12, 2016
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Source: [NPI Profile](https://npiprofile.com/npi/1275827123) · Data from the CMS NPPES public registry.