Quick answers
- Does Richard H. Greenspun accept Medicare assignment?
- Yes. Medicare's clinician data says Richard H. Greenspun 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 Richard H. Greenspun see?
- In 2024, CMS data shows 170 Original Medicare patients and 1,214 services for Richard H. Greenspun. This counts Original Medicare only and measures volume, not quality.
- What is Richard H. Greenspun's NPI number?
- 1417984600. 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 Richard H. Greenspun, 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 | 170 |
|---|---|
| Services billed to Medicare | 1,214 |
| Different services or procedures | 49 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)308 services
- Insertion of needle into vein for collection of blood sample (36415)200 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)200 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)71 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)60 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 cholesterol75%
- High blood pressure67%
- Ischemic heart disease42%
- Arthritis41%
- Diabetes25%
- Anxiety25%
Practice locations
Addresses where Richard H. Greenspun is enrolled with Medicare (CMS data updated October 2, 2026).
- 901 Wilshire Blvd, Fl 1Santa Monica, CA 90401 (310) 829‑8945
Group practices
Medicare enrollment lists Richard H. Greenspun as a member of this group (CMS data updated October 2, 2026).
- Providence Saint Johns Medical Foundation281 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Santa Monica
Clinicians with the same Medicare primary specialty in Santa Monica, CA — not a recommendation.
Other clinicians in Providence Saint Johns Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Georgetown University School Of Medicine |
| Graduation year | 1972 (54 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) | 1417984600 |
| 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