Quick answers
- Does Roman L. Kleynberg accept Medicare assignment?
- Yes. Medicare's clinician data says Roman L. Kleynberg 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 Roman L. Kleynberg see?
- In 2024, CMS data shows 2,118 Original Medicare patients and 15,118 services for Roman L. Kleynberg. This counts Original Medicare only and measures volume, not quality.
- What is Roman L. Kleynberg's NPI number?
- 1700103298. 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 Roman L. Kleynberg, 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 | 2,118 |
|---|---|
| Services billed to Medicare | 15,118 |
| Different services or procedures | 9 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)9,156 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)3,755 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)1,071 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)1,018 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%
- Depression75%
- Anxiety75%
- Chronic kidney disease74%
Hospitals where Roman L. Kleynberg works
Medicare's Facility Affiliation Data lists Roman L. Kleynberg 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.
- Kaiser Foundation Hospital - Los AngelesLos Angeles, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: not listed by Medicare · CCN 050138
- L A Downtown Medical CenterLos Angeles, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050763
- Los Angeles Community HospitalLos Angeles, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050663
- PIH Health Good Samaritan HospitalLos Angeles, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 050471
- Southern California Hospital at HollywoodHollywood, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050135
Practice locations
Addresses where Roman L. Kleynberg is enrolled with Medicare (CMS data updated October 2, 2026).
- 6221 Wilshire Blvd, Suite 504Los Angeles, CA 90048 (323) 965‑9995
Group practices
Medicare enrollment lists Roman L. Kleynberg as a member of this group (CMS data updated October 2, 2026).
- Advanced Hematology Oncology Medical Group Inc8 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Los Angeles
Clinicians with the same Medicare primary specialty in Los Angeles, CA — not a recommendation.
Other clinicians in Advanced Hematology Oncology Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2010 (16 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1700103298 |
| 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