Leonid Kleynberg, M.D.
NPI 1891750212 · Hematology & Oncology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Leonid Kleynberg, M.D. is a Hematology & Oncology Physician provider in Los Angeles, CA (NPI 1891750212).
Provider details
- NPI number
- 1891750212
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A76900 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
38,940 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Infusion Into a Vein for Hydration, Each Additional Hour96361 | 13,832 | $14 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 4,462 | $5 |
| Unclassified DrugsJ3490 | 4,024 | $1 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, 1 Hour Or Less96365 | 3,765 | $72 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 3,573 | $98 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 3,079 | $17 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ibrutinibbrand: Imbruvica | 19 | — |
| Azithromycin | 14 | 11 |
| Ciprofloxacin Hcl | 14 | — |
| Tamsulosin Hcl | 13 | — |
| Hydroxyurea | 13 | — |
| Omeprazole | 12 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,036 across 45 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-19
- Last updated
- 2011-11-17
Frequently asked questions
- What is Leonid Kleynberg's NPI number?
- Leonid Kleynberg's National Provider Identifier (NPI) is 1891750212, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leonid Kleynberg's specialty?
- Leonid Kleynberg is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Leonid Kleynberg located?
- Leonid Kleynberg's practice location on file with NPPES is 6221 Wilshire Blvd, Los Angeles, CA 90048-5201.
- What is Leonid Kleynberg's phone number?
- The practice phone number listed in the NPPES registry for Leonid Kleynberg is (323) 965-9995.
- Does Leonid Kleynberg accept Medicare?
- Leonid Kleynberg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Leonid Kleynberg's NPI active?
- Yes — Leonid Kleynberg's NPI (1891750212) is active in the NPPES registry as of the last update on 2011-11-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.