Deirdre Masterton, MD
NPI 1235314394 · Obstetrics & Gynecology Physician · Flemington, NJ
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Deirdre Masterton, MD is a Obstetrics & Gynecology Physician provider in Flemington, NJ (NPI 1235314394).
Provider details
- NPI number
- 1235314394
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 11711 (MT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 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
241 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 90 | $103 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 40 | $142 |
| Cervical Or Vaginal Cancer Screening; Pelvic and Clinical Breast ExaminationG0101 | 40 | $45 |
| Urinalysis, Manual Test81002 | 27 | $3 |
| Ultrasound Scan of Uterus, Ovaries, Tubes, Cervix and Pelvic Area Through Vagina76830 | 19 | $139 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 13 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Estradiol | 71 | 39 |
| Alendronate Sodium | 62 | 18 |
| Norethindronebrand: Nora-Be | 17 | — |
| Fluconazole | 15 | — |
| Clobetasol Propionate | 14 | 11 |
| Clotrimazole/Betamethasone Dipbrand: Clotrimazole-Betamethasone | 13 | — |
| Valacyclovir Hclbrand: Valacyclovir | 12 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$29 across 2 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
- 2008-01-08
- Last updated
- 2022-03-04
- Certified
- 2022-03-04
Frequently asked questions
- What is Deirdre Masterton's NPI number?
- Deirdre Masterton's National Provider Identifier (NPI) is 1235314394, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Deirdre Masterton's specialty?
- Deirdre Masterton is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Deirdre Masterton located?
- Deirdre Masterton's practice location on file with NPPES is 4 Walter E Foran Blvd, Flemington, NJ 08822-4664.
- What is Deirdre Masterton's phone number?
- The practice phone number listed in the NPPES registry for Deirdre Masterton is (908) 284-5295.
- Does Deirdre Masterton accept Medicare?
- Deirdre Masterton is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Deirdre Masterton's NPI active?
- Yes — Deirdre Masterton's NPI (1235314394) is active in the NPPES registry as of the last update on 2022-03-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.