Jennifer Marshak, MD
NPI 1750365912 · Obstetrics & Gynecology Physician · Port Jefferson, NY
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jennifer Marshak, MD is a Obstetrics & Gynecology Physician provider in Port Jefferson, NY (NPI 1750365912).
Provider details
- NPI number
- 1750365912
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 211465 (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
20 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
1,438 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 568 | $146 |
| Ultrasound Scan of Uterus, Ovaries, Tubes, Cervix and Pelvic Area Through Vagina76830 | 168 | $139 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 153 | $104 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 114 | $9 |
| Dxa Bone Density Measurement of Hip, Pelvis, Spine77080 | 93 | $45 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Raloxifene Hcl | 100 | 31 |
| Estradiol | 77 | 37 |
| Clobetasol Propionate | 58 | 44 |
| Clotrimazole/Betamethasone Dipbrand: Clotrimazole-Betamethasone | 57 | 42 |
| Risedronate Sodium | 52 | 18 |
| Valacyclovir Hclbrand: Valacyclovir | 39 | 17 |
| Alendronate Sodium | 37 | 11 |
| Estradiol |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$483 across 14 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
- 2005-12-01
- Last updated
- 2008-04-24
Frequently asked questions
- What is Jennifer Marshak's NPI number?
- Jennifer Marshak's National Provider Identifier (NPI) is 1750365912, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jennifer Marshak's specialty?
- Jennifer Marshak is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Jennifer Marshak located?
- Jennifer Marshak's practice location on file with NPPES is 118 N Country Rd, Port Jefferson, NY 11777-2120.
- What is Jennifer Marshak's phone number?
- The practice phone number listed in the NPPES registry for Jennifer Marshak is (631) 473-7171.
- Does Jennifer Marshak accept Medicare?
- Jennifer Marshak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jennifer Marshak's NPI active?
- Yes — Jennifer Marshak's NPI (1750365912) is active in the NPPES registry as of the last update on 2008-04-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.