Mark Geyer, MD
NPI 1831482561 · Hematology & Oncology Physician · New York, NY
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Geyer, MD is a Hematology & Oncology Physician provider in New York, NY (NPI 1831482561).
Provider details
- NPI number
- 1831482561
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 274263 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
15 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
740 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 234 | $78 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 213 | $131 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 161 | $113 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 37 | $87 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 33 | $170 |
| Hospital Discharge Day Management, 30 Minutes Or Less |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Acalabrutinib Maleatebrand: Calquence | 33 |
| Bosutinibbrand: Bosulif | 27 |
| Zanubrutinibbrand: Brukinsa | 23 |
| Venetoclaxbrand: Venclexta | 21 |
| Ponatinib Hclbrand: Iclusig | 19 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 17 |
| Acyclovir | 16 |
| Dasatinibbrand: Sprycel | 14 |
| Pirtobrutinibbrand: Jaypirca | 13 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$10,426 across 6 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-05-27
- Last updated
- 2020-05-08
- Certified
- 2020-05-08
Frequently asked questions
- What is Mark Geyer's NPI number?
- Mark Geyer's National Provider Identifier (NPI) is 1831482561, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Geyer's specialty?
- Mark Geyer is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Geyer located?
- Mark Geyer's practice location on file with NPPES is 1275 York Ave, New York, NY 10065-6007.
- What is Mark Geyer's phone number?
- The practice phone number listed in the NPPES registry for Mark Geyer is (212) 639-2000.
- Does Mark Geyer accept Medicare?
- Mark Geyer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Geyer's NPI active?
- Yes — Mark Geyer's NPI (1831482561) is active in the NPPES registry as of the last update on 2020-05-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.