Quick answers
- Does Billie J. Marek accept Medicare assignment?
- Yes. Medicare's clinician data says Billie J. Marek accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Billie J. Marek see?
- In 2024, CMS data shows 481 Original Medicare patients and 108,214 services for Billie J. Marek. This counts Original Medicare only and measures volume, not quality.
- What is Billie J. Marek's NPI number?
- 1346282209. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Billie J. Marek, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 481 |
|---|---|
| Services billed to Medicare | 108,214 |
| Different services or procedures | 142 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Injection, oxaliplatin, 0.5 mg (J9263)11,800 services
- Injection, pembrolizumab, 1 mg (J9271)10,300 services
- Injection, darbepoetin alfa, 1 microgram (non-esrd use) (J0881)3,745 services
- Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml (Q9967)2,915 services
- Injection, epoetin alfa-epbx, biosimilar, (retacrit) (for non-esrd use), 1000 units (Q5106)2,828 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)57%
- Chronic kidney disease45%
- Arthritis44%
- Diabetes41%
Hospitals where Billie J. Marek works
Medicare's Facility Affiliation Data lists Billie J. Marek at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Cuero Regional HospitalCuero, TX · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 450597
- De Tar Hospital NavarroVictoria, TX · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 450147
- El Campo Memorial HospitalEl Campo, TX · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 450694
- Lavaca Medical CenterHallettsville, TX · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 451376
- Yoakum Community HospitalYoakum, TX · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 451346
Practice locations
Addresses where Billie J. Marek is enrolled with Medicare (CMS data updated October 2, 2026).
- 601 E San Antonio St, Suite 101wVictoria, TX 77901 (361) 485‑9600
Group practices
Medicare enrollment lists Billie J. Marek as a member of this group (CMS data updated October 2, 2026).
- Regional Employee Assistance Program Inc105 clinicians in the group
Specialties
- Medical Oncologyprimary
- Internal Medicinealso
Other oncologists in Texas
Clinicians with the same Medicare primary specialty in Texas — not a recommendation.
Other clinicians in Regional Employee Assistance Program Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Medical School At San Antonio |
| Graduation year | 1983 (43 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1346282209 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians