Marissa Rybstein, M.D.
NPI 1447593132 · Hematology (Internal Medicine) Physician · New York, NY
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marissa Rybstein, M.D. is a Hematology (Internal Medicine) Physician provider in New York, NY (NPI 1447593132).
Provider details
- NPI number
- 1447593132
- Entity type
- Individual
- Primary specialty
- Hematology (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 283721 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,547 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 741 | $204 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 343 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 189 | $146 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 116 | $88 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 50 | $132 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ondansetron Hcl | 49 | 31 |
| Apixabanbrand: Eliquis | 48 | — |
| Oxycodone Hcl | 25 | 18 |
| Gabapentin | 23 | — |
| Dexamethasone | 23 | 12 |
| Osimertinib Mesylatebrand: Tagrisso | 21 | — |
| Prednisone | 20 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-04-01
- Last updated
- 2022-09-12
- Certified
- 2022-09-12
Frequently asked questions
- What is Marissa Rybstein's NPI number?
- Marissa Rybstein's National Provider Identifier (NPI) is 1447593132, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marissa Rybstein's specialty?
- Marissa Rybstein is listed in the NPPES registry with a primary specialty of Hematology (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Marissa Rybstein located?
- Marissa Rybstein's practice location on file with NPPES is 520 E 70th St # 341, New York, NY 10021-9800.
- What is Marissa Rybstein's phone number?
- The practice phone number listed in the NPPES registry for Marissa Rybstein is (212) 746-2061.
- Does Marissa Rybstein accept Medicare?
- Marissa Rybstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marissa Rybstein's NPI active?
- Yes — Marissa Rybstein's NPI (1447593132) is active in the NPPES registry as of the last update on 2022-09-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.