Marlene Diaz, M.D.
NPI 1427166644 · Gynecology Physician · Plano, TX
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marlene Diaz, M.D. is a Gynecology Physician provider in Plano, TX (NPI 1427166644).
Provider details
- NPI number
- 1427166644
- Entity type
- Individual
- Primary specialty
- Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- J1971 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
181 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 | 50 | $111 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 40 | $80 |
| Pelvic Exam99459 | 31 | $20 |
| Screening Papanicolaou Smear; Obtaining, Preparing and Conveyance of Cervical Or Vaginal Smear to LaboratoryQ0091 | 25 | $39 |
| Cervical Or Vaginal Cancer Screening; Pelvic and Clinical Breast ExaminationG0101 | 24 | $35 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 11 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Estradiol | 115 | 38 |
| Progesterone, Micronizedbrand: Progesterone | 97 | 32 |
| Spironolactone | 46 | 13 |
| Estradiolbrand: Estradiol (twice Weekly) | 29 | — |
| Levothyroxine Sodium | 23 | — |
| Liothyronine Sodium | 15 | — |
| Estradiolbrand: Estradiol (once Weekly) | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$195 across 11 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
- 2006-08-28
- Last updated
- 2022-09-01
- Certified
- 2022-09-01
Frequently asked questions
- What is Marlene Diaz's NPI number?
- Marlene Diaz's National Provider Identifier (NPI) is 1427166644, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marlene Diaz's specialty?
- Marlene Diaz is listed in the NPPES registry with a primary specialty of Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Marlene Diaz located?
- Marlene Diaz's practice location on file with NPPES is 3060 Communications Pkwy Ste 105, Plano, TX 75093-8464.
- What is Marlene Diaz's phone number?
- The practice phone number listed in the NPPES registry for Marlene Diaz is (972) 535-8000.
- Does Marlene Diaz accept Medicare?
- Marlene Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marlene Diaz's NPI active?
- Yes — Marlene Diaz's NPI (1427166644) is active in the NPPES registry as of the last update on 2022-09-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.