Quick answers
- Does Oscar Zambrano accept Medicare assignment?
- Yes. Medicare's clinician data says Oscar Zambrano 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 Oscar Zambrano see?
- In 2024, CMS data shows 388 Original Medicare patients and 1,349 services for Oscar Zambrano. This counts Original Medicare only and measures volume, not quality.
- What is Oscar Zambrano's NPI number?
- 1184628927. 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 Oscar Zambrano, 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 | 388 |
|---|---|
| Services billed to Medicare | 1,349 |
| Different services or procedures | 38 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)369 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)305 services
- Insertion of needle into vein for collection of blood sample (36415)134 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)131 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)70 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%
- Diabetes61%
- Arthritis56%
- Chronic kidney disease43%
- Ischemic heart disease36%
Practice locations
Addresses where Oscar Zambrano is enrolled with Medicare (CMS data updated October 2, 2026).
- 6513 Atlantic AveCudahy, CA 90201 (323) 581‑1649
- 6513 Atlantic AveBell, CA 90201 (562) 444‑5450
Group practices
Medicare enrollment lists Oscar Zambrano as a member of this group (CMS data updated October 2, 2026).
- Welcome Health Medical Group6 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in California →
Other cardiologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Welcome Health Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1972 (54 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1184628927 |
| 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