Quick answers
- Does Gilbert F. Gelfand accept Medicare assignment?
- Yes. Medicare's clinician data says Gilbert F. Gelfand 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 Gilbert F. Gelfand see?
- In 2024, CMS data shows 338 Original Medicare patients and 16,853 services for Gilbert F. Gelfand. This counts Original Medicare only and measures volume, not quality.
- What is Gilbert F. Gelfand's NPI number?
- 1942247580. 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 Gilbert F. Gelfand, 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 | 338 |
|---|---|
| Services billed to Medicare | 16,853 |
| Different services or procedures | 50 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, denosumab, 1 mg (J0897)4,796 services
- Injection, methylprednisolone acetate, 1 mg (J1010)3,075 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)873 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)478 services
- Administration of non-hormonal anti-neoplastic chemotherapy under skin or into muscle (96401)171 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%
- Arthritis75%
- Osteoporosis57%
- Diabetes41%
- Chronic kidney disease29%
Hospitals where Gilbert F. Gelfand works
Medicare's Facility Affiliation Data lists Gilbert F. Gelfand 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.
- Lac/Rancho Los Amigos National Rehabilitation CenterDowney, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050717
- PIH Health Downey HospitalDowney, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050393
- PIH Health Hospital-WhittierWhittier, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050169
Practice locations
Addresses where Gilbert F. Gelfand is enrolled with Medicare (CMS data updated October 2, 2026).
- 12456 Washington BlvdWhittier, CA 90602 (562) 758‑6600
Group practices
Medicare enrollment lists Gilbert F. Gelfand as a member of this group (CMS data updated October 2, 2026).
- Amicus Arthritis and Osteoporosis Center Inc4 clinicians in the group
Specialties
- Rheumatologyprimary
Other rheumatologists in Whittier
Clinicians with the same Medicare primary specialty in Whittier, CA — not a recommendation.
Other clinicians in Amicus Arthritis and Osteoporosis Center Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1975 (51 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) | 1942247580 |
| 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