OpenMedicare
Start Here
Explore
Fraud
Investigations
Data
Tools
About

Footer

OpenMedicare

Independent Medicare data journalism

Sister Sites

  • OpenMedicaid
  • OpenFeds
  • OpenSpending

Explore

  • Providers
  • Procedures
  • States
  • Specialties
  • Search

Fraud Analysis

  • Still Out There (AI)
  • Fraud Overview
  • Fraud Watchlist
  • Deep Dive Profiles
  • Impossible Numbers
  • Report Fraud

Investigations

  • The Algorithm Knows
  • How We Built the Model
  • Internal Medicine Crisis
  • Florida & California Fraud
  • Million Dollar Flagged
  • All Investigations

Tools

  • Provider Lookup
  • Compare
  • Cost Calculator
  • Your Medicare Dollar
  • Downloads

About

  • About OpenMedicare
  • Methodology
  • Glossary
  • Data Sources
  • API Docs
  • Updates
Data Sources: Centers for Medicare & Medicaid Services (CMS), Medicare Provider Utilization and Payment Data
Disclaimer: This site is an independent journalism project. Data analysis and editorial content are not affiliated with or endorsed by CMS or any government agency. All spending figures are based on publicly available Medicare payment records.
Sister Sites: OpenMedicaid ยท OpenFeds ยท OpenSpending

ยฉ 2026 OpenMedicare. Independent data journalism. Built by TheDataProject.ai

Methodologyโ€ขDownload Data
  1. Home
  2. Providers
  3. Leonid Kleynberg
๐ŸŽ—๏ธ
MDIndividual

Leonid Kleynberg, M.D.

NPI: 1891750212
Los Angeles, CA
10 years of data
Hematology-Oncology
$8.6M
Total Payments
31.0K
Beneficiaries
328.2K
Services
2.02x
Markup Ratio

Peer Comparison

98th
percentile in specialty
This provider$8.6M
Specialty median$339.6K

๐Ÿ“‹ Key Findings

1Billed $8.6M over 10 years
22.02x markup ratio (above median)
398th percentile in Hematology-Oncology by payments
4131 services/day โ€” unusually high
5Payments surged 125% in 2020
61 procedure with >3x markup

This provider averages 131 services per working day

Based on 328.2K total services over 10 years (250 working days/year). Learn about impossible service volumes โ†’

๐Ÿ”Ž Data Analysis

This provider's $8.6M in total Medicare payments ranks in the 98th percentile of Hematology-Oncology providers nationally.

Averaging 131 services per working day raises questions about billing patterns.

AI-generated analysis based on Medicare payment data.

Annual Medicare Payments

Annual Services Provided

Avg Payment per Service

Markup Ratio Over Time

๐Ÿ“ˆ

Notable: Payments increased 125% in 2020

Year-over-year payment surges can indicate changes in practice volume, new services, or billing pattern shifts.

Submitted Charges vs. Medicare Payments

Average per-service amounts submitted by the provider compared to what Medicare actually paid โ€” the gap represents the markup.

YearAvg SubmittedAvg PaidMarkup RatioGap per ServiceTotal PaymentsServicesBeneficiaries
2014$96.59$46.032.10x$50.56$776.9K23.4K2.7K
2015$93.35$43.622.14x$49.73$1.1M27.7K3.5K
2016$89.40$40.722.20x$48.68$1.1M32.9K3.8K
2017$86.38$37.892.28x$48.49$935.1K33.5K3.5K
2018$94.37$44.052.14x$50.32$1.1M43.7K3.8K
2019$73.11$31.982.29x$41.13$278.3K14.1K2.5K
2020$76.87$34.882.20x$41.99$626.6K32.6K2.6K
2021$329.19$103.703.17x$225.49$951.9K39.5K2.8K
2022$71.61$31.772.25x$39.84$865.3K38.1K2.9K
2023$75.87$33.862.24x$42.01$892.2K42.7K2.9K

Top Procedures (20)

99213Established patient office or other outpatient visit, typically 15 minutes
$1.8M
25.2K services$69.67/svc1.67x markup
96365Infusion into a vein for therapy, prevention, or diagnosis up to 1 hour
$1.7M
27.6K services$62.48/svc2.06x markup
99232Subsequent hospital inpatient care, typically 25 minutes per day
$1.4M
22.7K services$59.69/svc1.89x markup
99233Subsequent hospital inpatient care, typically 35 minutes per day
$755.7K
8.8K services$86.13/svc1.87x markup
99214Established patient office or other outpatient, visit typically 25 minutes
$392.9K
4.3K services$90.82/svc1.89x markup
96361Hydration infusion into a vein
$367.7K
29.9K services$12.30/svc2.23x markup
99223Initial hospital inpatient care, typically 70 minutes per day
$366.7K
2.2K services$167.98/svc1.86x markup
96413Infusion of chemotherapy into a vein up to 1 hour
$259.9K
2.1K services$125.15/svc2.14x markup
85025Complete blood cell count (red cells, white blood cell, platelets), automated test
$222.9K
24.2K services$9.21/svc1.85x markup
99212Established patient office or other outpatient visit, typically 10 minutes
$221.8K
5.6K services$39.27/svc1.82x markup
96367Infusion into a vein for therapy prevention or diagnosis additional sequential infusion up to 1 hour
$210.8K
7.7K services$27.22/svc2.16x markup
96375Injection of different drug or substance into a vein for therapy, diagnosis, or prevention
$160.3K
9.9K services$16.21/svc2.52x markup
36415Insertion of needle into vein for collection of blood sample
$109.1K
33.6K services$3.24/svc1.54x markup
J2505Injection, pegfilgrastim, 6 mgโš  3.8x markup
$94.3K
45 services$2.1K/svc3.82x markup
96366Infusion into a vein for therapy, prevention, or diagnosis
$85.5K
4.7K services$18.27/svc2.10x markup
99205New patient office or other outpatient visit, typically 60 minutes
$60.7K
363 services$167.17/svc1.97x markup
96415Infusion of chemotherapy into a vein
$50.6K
1.9K services$26.14/svc2.14x markup
96372Injection beneath the skin or into muscle for therapy, diagnosis, or prevention
$46.4K
2.7K services$17.07/svc2.45x markup
96417Infusion of different chemotherapy drug or substance into a vein up to 1 hour
$44.3K
758 services$58.44/svc2.26x markup
99195Therapeutic removal of whole blood to correct blood level imbalance
$43.5K
472 services$92.26/svc1.71x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
99213Established patient office or other outpatient visit, typically 15 minutes25.2K$1.8M$69.671.67x
96365Infusion into a vein for therapy, prevention, or diagnosis up to 1 hour27.6K$1.7M$62.482.06x
99232Subsequent hospital inpatient care, typically 25 minutes per day22.7K$1.4M$59.691.89x
99233Subsequent hospital inpatient care, typically 35 minutes per day8.8K$755.7K$86.131.87x
99214Established patient office or other outpatient, visit typically 25 minutes4.3K$392.9K$90.821.89x
96361Hydration infusion into a vein29.9K$367.7K$12.302.23x
99223Initial hospital inpatient care, typically 70 minutes per day2.2K$366.7K$167.981.86x
96413Infusion of chemotherapy into a vein up to 1 hour2.1K$259.9K$125.152.14x
85025Complete blood cell count (red cells, white blood cell, platelets), automated test24.2K$222.9K$9.211.85x
99212Established patient office or other outpatient visit, typically 10 minutes5.6K$221.8K$39.271.82x
96367Infusion into a vein for therapy prevention or diagnosis additional sequential infusion up to 1 hour7.7K$210.8K$27.222.16x
96375Injection of different drug or substance into a vein for therapy, diagnosis, or prevention9.9K$160.3K$16.212.52x
36415Insertion of needle into vein for collection of blood sample33.6K$109.1K$3.241.54x
J2505Injection, pegfilgrastim, 6 mg45$94.3K$2.1K3.82x
96366Infusion into a vein for therapy, prevention, or diagnosis4.7K$85.5K$18.272.10x
99205New patient office or other outpatient visit, typically 60 minutes363$60.7K$167.171.97x
96415Infusion of chemotherapy into a vein1.9K$50.6K$26.142.14x
96372Injection beneath the skin or into muscle for therapy, diagnosis, or prevention2.7K$46.4K$17.072.45x
96417Infusion of different chemotherapy drug or substance into a vein up to 1 hour758$44.3K$58.442.26x
99195Therapeutic removal of whole blood to correct blood level imbalance472$43.5K$92.261.71x

Markup Analysis

Charge-to-Payment Ratio

2.02x

This provider submits charges 2.02 times higher than what Medicare actually pays.

What This Means

A markup ratio of 2.02x means for every $100 Medicare pays, this provider initially charges $202. This is higher than the national average.

Location

Los Angeles, CA

Provider Verification

Always verify provider credentials and location before scheduling appointments. This data reflects Medicare payments and may not include all practice locations.

Similar Providers

Other Hematology-Oncology providers in CA for peer comparison.

Leonid Kleynberg (you)
$8.6M
Luke Dreisbach, M.D.
$77.2M
Sachin Gupta, M.D.
$55.1M
Ravi Rao, MDโš ๏ธ
$49.1M
Michael Sherman, M.D., PHD
$38.9M
Nerses Tchekmedyian, M.D.
$38.0M
Show detailed table โ–พ
ProviderLocationTotal PaymentsStatus
Luke Dreisbach, M.D.Rancho Mirage, CA$77.2Mโœ“ Clear
Sachin Gupta, M.D.Fresno, CA$55.1Mโœ“ Clear
Ravi Rao, MDFresno, CA$49.1Mโš ๏ธ Flagged
Michael Sherman, M.D., PHDWalnut Creek, CA$38.9Mโœ“ Clear
Nerses Tchekmedyian, M.D.Irvine, CA$38.0Mโœ“ Clear

Related

Browse
โ† Back to Provider Directory
State
All providers in CA โ†’
Specialty
All Hematology-Oncology providers โ†’
Tool
Compare this provider โ†’
Analysis
Fraud Watchlist โ†’
Search
Search all providers โ†’

Share This Provider

Share this provider's Medicare payment information

Share:

Data Sources

  • โ€ข Centers for Medicare & Medicaid Services (CMS)
  • โ€ข Medicare Provider Utilization and Payment Data (2014-2023)
  • โ€ข National Plan and Provider Enumeration System (NPPES)

Last Updated: February 2026 (data through 2023, the latest CMS release)

Note: All data is from publicly available Medicare records. OpenMedicare is an independent journalism project not affiliated with CMS.

Believe this data is inaccurate? Dispute this data