Leonid Kleynberg, M.D.
Hematology & Oncology Physician · Los Angeles, CA
Leonid Kleynberg, M.D. is a hematology & oncology physician with a practice address in Los Angeles, California, and NPI 1891750212, issued on Apr 19, 2006. Check the license (California A76900, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Leonid Kleynberg
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- A76900 CA
Self-reported in NPPES; status is on the state search - Practice location
- 6221 Wilshire Blvd, Los Angeles, CA 90048
- Phone
- (323) 965-9995
- Enumerated
- Apr 19, 2006
- Record last updated
- Nov 17, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (323) 965-5678
- Medicaid ID
- 00A769000 CA
- Medicare enrollment
- Enrolled (PECOS I20040315000569); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 6221 Wilshire Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Leonid Kleynberg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A76900Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
286 Medicare Part D claims for 60 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of claims.
Most prescribed
- Imbruvica19 claims
- Azithromycin14 claims
- Ciprofloxacin Hcl14 claims
- Hydroxyurea13 claims
- Tamsulosin Hcl13 claims
- Omeprazole12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,036.33
45 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Biotech, Inc. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Kleynberg Medical Clinic IncLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Leonid Kleynberg among 1,583 hematology & oncology physician records in California
Leonid Kleynberg, M.D. is one of 1,583 hematology & oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 54% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1976 · median 2003 among the 1,124 with a school on file
- Record last updated2011 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in Los Angeles → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Mouni Audeh, M.D.West Hollywood, CA 900481265592174
- John Chute, M.D.West Hollywood, CA 900481164505319
- Maria Delioukina, MDWest Hollywood, CA 900481023035078
- Charles Forscher, MDLos Angeles, CA 900481235239088
- Richard Gould, MDWest Hollywood, CA 900481194743385
- Andrew Hendifar, MD, MPHWest Hollywood, CA 900481649473414
- Vera Kleynberg, M.D.Los Angeles, CA 900481568428324
- Akil Merchant, M.D.Los Angeles, CA 900481821074857
Common questions
What is Leonid Kleynberg, M.D.'s NPI number?
Leonid Kleynberg, M.D.'s National Provider Identifier (NPI) is 1891750212, issued on Apr 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Leonid Kleynberg, M.D. located?
The NPPES record lists a practice address at 6221 Wilshire Blvd, Los Angeles, CA, 90048. Phone: (323) 965-9995. Providers update this record themselves, so call before visiting.
How can I verify Leonid Kleynberg, M.D.'s license?
NPPES lists California license number A76900, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Leonid Kleynberg, M.D. prescribe under Medicare Part D?
In 2024, Leonid Kleynberg, M.D. had 286 Medicare Part D claims for 60 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Leonid Kleynberg, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.