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Edit this profileAt a glance
- 118 N Country Rd, Port Jefferson, NY 11777
About Dr. Marshak
Based in Port Jefferson, NY, Jennifer D. Marshak, MD is listed in the NPI registry under obstetrics & gynecology. Jennifer graduated from Duke University School of Medicine in 1996. According to Medicare claims data, Jennifer cared for 1,257 Medicare patients across 4,018 services. The services billed most often include injection, denosumab, 1 mg, established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, and ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina. NPI 1750365912 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (631) 473-7171
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
118 N COUNTRY RD
Port Jefferson, NY 11777
Conditions Commonly Evaluated or Treated
Within Obstetrics and Gynecology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Contraception
Fertility
High-risk or subspecialty
Infections
Pelvic pain and benign gynecology
- Uterine fibroids
- Chronic pelvic pain
- Ovarian cysts
- Painful intercourse
- Pelvic organ prolapse
- Urinary incontinence in women
Most searched conditions
Infections and vulvovaginal conditions
Menstrual and hormonal
- Absent periods
- Genitourinary syndrome of menopause
- Painful periods
- Perimenopause
- Premenstrual syndrome
Pregnancy
- Ectopic pregnancy
- Gestational diabetes
- Hyperemesis gravidarum
- Miscarriage
- Placenta previa
- Postpartum depression
- Preeclampsia
- Preterm labor
Cancer and precancer
- Abnormal cervical cells and cervical dysplasia
- Cervical cancer
- Endometrial cancer
- Endometrial hyperplasia
- Ovarian cancer
Pregnancy Complications
Vaginal & Vulvar Health
Procedures & services
Diagnostic Tests
Hormone & Menopause
Laparoscopic and adnexal surgery
Pelvic floor
Pregnancy and delivery
Preventive and diagnostic
- Pelvic examination
- Transvaginal ultrasound
- Well-woman examination
- Colposcopy
- Endometrial biopsy
- Human papillomavirus testing
Subspecialty procedures
Surgeries
Most searched procedures
Contraception and office treatment
Birth Control
Contraception
Diagnostic Procedures
- Amniocentesis
Fertility
- Egg freezing
- Intrauterine Insemination (IUI)
Postpartum Care
Pregnancy & Prenatal
Preventive Care
Preventive Screening
Routine Exams
Uterine and cervical procedures
Procedures Most Often Billed to Medicare
4,018 services · 1,257 patients · 16 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
114 | More than most peers in OB-GYN |
| Biopsy of lining of uterus | Procedure | 58100 |
31 | More than most peers in OB-GYN |
| Insertion of tube and introduction of contrast for x-ray of uterus and fallopian tubes | Procedure | 58340 |
28 | More than most peers in OB-GYN |
| Punch biopsy, first skin growth | Procedure | 11104 |
15 | Too few peers to compare |
| Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina | Imaging | 76830 |
168 | More than most peers in OB-GYN |
| Dxa bone density measurement of hip, pelvis, spine | Imaging | 77080 |
93 | More often than most peers in OB-GYN |
| Ultrasound scan of uterus and uterine cavity | Imaging | 76831 |
27 | More than most peers in OB-GYN |
| Complete ultrasound scan of pelvis | Imaging | 76856 |
15 | Less often than most peers in OB-GYN |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
49 | More often than most peers in OB-GYN |
| Injection, denosumab, 1 mg | Drug given | J0897 |
2,580 | More often than most peers in OB-GYN |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other OB-GYNs at this location 8
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Trained at Duke University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
More connections — 13 related providers in 2 groups
Class of 1996 at Duke University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle into vein for collection of blood sample 5
Providers in NY who bill this service to Medicare most often.
Common questions
What is Dr. Marshak's specialty?
Dr. Marshak is an OB-GYN in Port Jefferson, NY. That is the designation recorded for this NPI in the federal registry, where it is listed as “Obstetrics & Gynecology”.
NPI registry
Where can I find Dr. Marshak?
Dr. Marshak is listed at 118 N Country Rd, Port Jefferson, NY 11777. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Marshak?
The number on file is (631) 473-7171. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Marshak's NPI number?
Dr. Marshak's National Provider Identifier is 1750365912. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Marshak's medical education?
Dr. Marshak attended Duke University School of Medicine, graduating in 1996. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Marshak been practicing?
Dr. Marshak has 30 years experience. Calculated from a graduation year of 1996, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Marshak known for?
According to Medicare billing data, Dr. Marshak performs procedures including insertion of needle into vein for collection of blood sample, biopsy of lining of uterus and insertion of tube and introduction of contrast for x-ray of uterus and fallopian tubes; reads or performs imaging such as ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina and dxa bone density measurement of hip, pelvis, spine; provides treatments such as injection of drug or substance under skin or into muscle, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Marshak confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Marshak. If this is you, claiming it is free.
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