DR. MARK BLAINE GEYER MD
NPI 1831482561
Internal Medicine - Hematology & Oncology in New York, NY
About Dr. Mark Blaine Geyer Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK BLAINE GEYER MD (NPI 1831482561) is an individual hematology & oncology provider in New York, New York, licensed in New York (274263) and active in the NPI registry since May 2011. He is enrolled in Medicare PECOS and is a graduate of Columbia University College Of Physicians And Surgeons (2011).
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
Dr. Mark Blaine Geyer Md 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
3Medicare enrollment records show Mark Geyer reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10065
- Reassigned Medicare billing, New York enrollment
- 428 clinicians in this Medicare group
Middletown, NJ 07748
- Reassigned Medicare billing, New Jersey enrollment
- 464 clinicians in this Medicare group
Basking Ridge, NJ 07920
- Reassigned Medicare billing, New Jersey enrollment
- 385 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 8
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10065 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 10065
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 Geyer's NPI number?
The NPI number for Mark Geyer is 1831482561. It was assigned to this individual provider in the NPPES registry on May 27, 2011.
Where is Mark Geyer located?
Mark Geyer practices at 1275 York Ave, New York, NY 10065. The listed phone number is (212) 639-2000.
What is Mark Geyer's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Mark Geyer enrolled in Medicare?
Yes. Mark Geyer 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 Geyer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Geyer reassigns Medicare benefits to 3 organizations: Memorial Hematology Lymphoma Group (New York, NY), Msk Monmouth (Middletown, NJ) and Memorial Sloan Kettering Cancer Center At Basking Ridge New Jersey (Basking Ridge, NJ). 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 Geyer'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 Geyer was last updated on May 8, 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. Mark Blaine Geyer, MD · NPI 1831482561
Hematology & Oncology physician in New York, New York. Individual provider, active in the CMS NPPES registry since May 27, 2011.
## Identity
- **NPI:** 1831482561 (Entity type: Individual)
- **Enumerated:** May 27, 2011
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** 274263 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 1275 YORK AVE, New York, NY 10065-6007
- **Phone:** (212) 639-2000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Memorial Hematology Lymphoma Group (NPI 1891766366, New York, NY); Msk Monmouth (NPI 1922459163, Middletown, NJ); Memorial Sloan Kettering Cancer Center At Basking Ridge New Jersey (NPI 1184637886, Basking Ridge, NJ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Columbia University College Of Physicians And Surgeons, class of 2011
## Record status
- **NPPES last updated:** May 8, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1831482561) · Data from the CMS NPPES public registry.