Quick answers
- Does Mariza D. Oliver accept Medicare assignment?
- Yes. Medicare's clinician data says Mariza D. Oliver 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 Mariza D. Oliver see?
- In 2024, CMS data shows 171 Original Medicare patients and 3,034 services for Mariza D. Oliver. This counts Original Medicare only and measures volume, not quality.
- What is Mariza D. Oliver's NPI number?
- 1477969848. 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 Mariza D. Oliver, 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 | 171 |
|---|---|
| Services billed to Medicare | 3,034 |
| Different services or procedures | 31 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)387 services
- Insertion of needle into vein for collection of blood sample (36415)336 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)260 services
- Blood test, comprehensive group of blood chemicals (80053)241 services
- Ferritin (blood protein) level (82728)127 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%
- Diabetes64%
- Chronic kidney disease61%
- Arthritis50%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)37%
Practice locations
Addresses where Mariza D. Oliver is enrolled with Medicare (CMS data updated October 2, 2026).
- 2150 US Hwy 83 NBrownsville, TX 78521 (956) 548‑0810
Group practices
Medicare enrollment lists Mariza D. Oliver as a member of this group (CMS data updated October 2, 2026).
- Texas Oncology PA1,014 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Brownsville
Clinicians with the same Medicare primary specialty in Brownsville, TX — not a recommendation.
Other clinicians in Texas Oncology PA
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2012 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1477969848 |
| 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
- 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