Ron Gejman, MD, PHD
NPI 1811523848 · Medical Oncology Physician · New York, NY
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ron Gejman, MD, PHD is a Medical Oncology Physician provider in New York, NY (NPI 1811523848).
Provider details
- NPI number
- 1811523848
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 323560 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Anastrozole | 15 |
| Omeprazole | 13 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-03-21
- Last updated
- 2026-04-30
- Certified
- 2026-04-30
Frequently asked questions
- What is Ron Gejman's NPI number?
- Ron Gejman's National Provider Identifier (NPI) is 1811523848, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ron Gejman's specialty?
- Ron Gejman is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Ron Gejman located?
- Ron Gejman's practice location on file with NPPES is 177 Fort Washington Ave, New York, NY 10032-3733.
- What is Ron Gejman's phone number?
- The practice phone number listed in the NPPES registry for Ron Gejman is (212) 305-8923.
- Does Ron Gejman accept Medicare?
- Ron Gejman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ron Gejman's NPI active?
- Yes — Ron Gejman's NPI (1811523848) is active in the NPPES registry as of the last update on 2026-04-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.