Quick answers
- Does Ellsworth R. Grant accept Medicare assignment?
- Yes. Medicare's clinician data says Ellsworth R. Grant 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 Ellsworth R. Grant see?
- In 2024, CMS data shows 124 Original Medicare patients and 26,224 services for Ellsworth R. Grant. This counts Original Medicare only and measures volume, not quality.
- What is Ellsworth R. Grant's NPI number?
- 1043233760. 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 Ellsworth R. Grant, 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 | 124 |
|---|---|
| Services billed to Medicare | 26,224 |
| Different services or procedures | 73 |
| Participating Medicare provider | Yes |
| Average age of these patients | 67 |
Most frequent services
- Injection, ondansetron hydrochloride, per 1 mg (J2405)652 services
- Injection, diphenhydramine hcl, up to 50 mg (J1200)365 services
- Injection of drug or substance under skin or into muscle (96372)168 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)161 services
- Insertion of needle into vein for collection of blood sample (36415)75 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%
- Diabetes48%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)44%
- Chronic kidney disease40%
- Arthritis39%
Hospitals where Ellsworth R. Grant works
Medicare's Facility Affiliation Data lists Ellsworth R. Grant 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.
- California Hospital Medical Center LALos Angeles, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050149
Practice locations
Addresses where Ellsworth R. Grant is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 7; the Medicare profile lists all.
- 11100 Warner Ave, Suite 214Fountain Valley, CA 92708 (714) 594‑7820
- 1127 Wilshire Blvd, Suite 900Los Angeles, CA 90017 (213) 481‑3948
- 11525 Brookshire Ave, Suite 202Downey, CA 90241 (562) 869‑1201
- 1510 S Central Ave, Suite 240Glendale, CA 91204 (562) 232‑0550
- 1513 S Grand Ave, Suite 360Los Angeles, CA 90015 (213) 246‑2422
Group practices
Medicare enrollment lists Ellsworth R. Grant as a member of this group (CMS data updated October 2, 2026).
- The Oncology Institute Ca, a Professional Corporation113 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Fountain Valley
Clinicians with the same Medicare primary specialty in Fountain Valley, CA — not a recommendation.
Other clinicians in The Oncology Institute Ca, a Professional Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Diego School Of Medicine |
| Graduation year | 1990 (36 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) | 1043233760 |
| 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