Natalie Semenyuk, M.D.
NPI 1841232642 · Obstetrics & Gynecology Physician · East Setauket, NY
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Natalie Semenyuk, M.D. is a Obstetrics & Gynecology Physician provider in East Setauket, NY (NPI 1841232642).
Provider details
- NPI number
- 1841232642
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- License
- 230610 (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
20 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
112 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) |
|---|---|---|
| Ultrasound Scan of Uterus, Ovaries, Tubes, Cervix and Pelvic Area Through Vagina76830 | 29 | $144 |
| 3d Radiographic Procedure76376 | 24 | $29 |
| Limited Ultrasound Scan of Pelvis76857 | 24 | $58 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 23 | $153 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 12 | $134 |
Typical Medicare-allowed amounts for these services range $29–$153 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Norethindrone Acetate | 71 |
| Fluconazole | 27 |
| Sertraline Hcl | 24 |
| Desogestrel-Ethinyl Estradiolbrand: Apri | 14 |
| Estradiol | 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
- 2006-06-13
- Last updated
- 2007-07-08
Frequently asked questions
- What is Natalie Semenyuk's NPI number?
- Natalie Semenyuk's National Provider Identifier (NPI) is 1841232642, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Natalie Semenyuk's specialty?
- Natalie Semenyuk is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Natalie Semenyuk located?
- Natalie Semenyuk's practice location on file with NPPES is 6 Technology Dr, East Setauket, NY 11733-4047.
- What is Natalie Semenyuk's phone number?
- The practice phone number listed in the NPPES registry for Natalie Semenyuk is (631) 444-4686.
- Does Natalie Semenyuk accept Medicare?
- Natalie Semenyuk is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Natalie Semenyuk's NPI active?
- Yes — Natalie Semenyuk's NPI (1841232642) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.