Billie Marek, MD
NPI 1346282209 · Medical Oncology Physician · Mcallen, TX
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Billie Marek, MD is a Medical Oncology Physician provider in Mcallen, TX (NPI 1346282209).
Provider details
- NPI number
- 1346282209
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- H3700 (TX)
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
5,245 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 803 | $9 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 779 | $8 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 591 | $10 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 478 | $121 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 273 | $14 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 250 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Letrozole | 118 | 26 |
| Anastrozole | 81 | 22 |
| Lenalidomidebrand: Revlimid | 50 | — |
| Potassium Chloride | 40 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 39 | 12 |
| Dexamethasone | 36 | — |
| Acyclovir | 33 | — |
| Hydroxyurea |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$107 across 5 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
- 2006-06-12
- Last updated
- 2017-08-31
Frequently asked questions
- What is Billie Marek's NPI number?
- Billie Marek's National Provider Identifier (NPI) is 1346282209, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Billie Marek's specialty?
- Billie Marek is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Billie Marek located?
- Billie Marek's practice location on file with NPPES is 1901 S 2nd St, Mcallen, TX 78503-1271.
- What is Billie Marek's phone number?
- The practice phone number listed in the NPPES registry for Billie Marek is (956) 687-5150.
- Does Billie Marek accept Medicare?
- Billie Marek is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Billie Marek's NPI active?
- Yes — Billie Marek's NPI (1346282209) is active in the NPPES registry as of the last update on 2017-08-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.