Quick answers
- Does Karlos Z. Oregel accept Medicare assignment?
- Yes. Medicare's clinician data says Karlos Z. Oregel 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 Karlos Z. Oregel see?
- In 2024, CMS data shows 176 Original Medicare patients and 540 services for Karlos Z. Oregel. This counts Original Medicare only and measures volume, not quality.
- What is Karlos Z. Oregel's NPI number?
- 1184913006. 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 Karlos Z. Oregel, 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 | 176 |
|---|---|
| Services billed to Medicare | 540 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)245 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)202 services
- Telephone or internet assessment with verbal and written report by consulting physician, 11-20 minutes (99447)29 services
- New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)23 services
- Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)13 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 cholesterol64%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)61%
- Diabetes53%
- Arthritis41%
- Chronic kidney disease27%
Hospitals where Karlos Z. Oregel works
Medicare's Facility Affiliation Data lists Karlos Z. Oregel 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.
- Community Memorial Hospital - VenturaVentura, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050394
- Ventura County Medical CenterVentura, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050159
Practice locations
Addresses where Karlos Z. Oregel is enrolled with Medicare (CMS data updated October 2, 2026).
- 11234 Anderson StLoma Linda, CA 92354
- 26520 Cactus AveMoreno Valley, CA 92555
- 26520 Cactus Ave, Suite 2021Moreno Valley, CA 92555 (951) 486‑5700
- 2900 Loma Vista Rd, Suite 205Ventura, CA 93003 (805) 642‑4830
- 300 Hillmont AveVentura, CA 93003 (805) 654‑3306
Group practices
Medicare enrollment lists Karlos Z. Oregel as a member of these groups (CMS data updated October 2, 2026).
- Faculty Physicians and Surgeons of Llusm1,315 clinicians in the group
- County of Ventura344 clinicians in the group
- Community Memorial Health System185 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Loma Linda
Clinicians with the same Medicare primary specialty in Loma Linda, CA — not a recommendation.
Other clinicians in Faculty Physicians and Surgeons of Llusm
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 2011 (15 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1184913006 |
| 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