Medicare Enrolled
Dr. Benjamin Leach, M.D.
Hematology & Oncology · Mission Hills, CA
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Leach from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
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What this data tells you about Dr. Leach
Dr. Benjamin Leach is a hematology & oncology specialist in Mission Hills, CA, with 14 years of NPI registration. Based on federal Medicare data, Dr. Leach performed 55,286 Medicare services in 2023. These records do not provide a deduplicated patient total.
Between the years covered by Open Payments, Dr. Leach received a total of $14,302 from 35 pharmaceutical and/or device companies across 135 payment records. A record can group multiple payments. These transfers are publicly reported through CMS Open Payments. Disclosure alone does not establish their effect on care. A reliable breakdown by payment category is not available in this snapshot. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Leach is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 14 years of NPI registration
▲ Top 14% volume in CA
$14,302 industry payments
Medicare Practice Summary — 2023
Medicare Utilization ↗55,286
Medicare services
Top 14% in CA for hematology & oncology
Not available
Unique patients (not deduplicated)
$18
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Darbepoetin injection (Aranesp) for anemia An injection of darbepoetin alfa used for non-end-stage renal disease purposes. |
15,700 | $2 | $10 |
| Pembrolizumab injection (Keytruda) | 13,400 | $43 | $193 |
| Paclitaxel chemotherapy injection | 9,411 | $0 | $0 |
| Anti-nausea injection (aprepitant) | 6,240 | $1 | $6 |
| Denosumab injection (Prolia/Xgeva) | 5,040 | $19 | $83 |
| Anti-nausea injection (ondansetron/Zofran) | 948 | $0 | $0 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
824 | $0 | $0 |
| Pegfilgrastim injection, 0.5 mg An injection of pegfilgrastim, a medication that stimulates the production of white blood cells. This specific code applies to the brand-name drug and excludes biosimilar versions. |
552 | $71 | $318 |
| Carboplatin chemotherapy injection, 50 mg Administration of a 50 mg dose of carboplatin, a chemotherapy medication, via injection. |
377 | $2 | $9 |
| Office visit, established patient, complex (40-54 min) An office or outpatient visit for an existing patient lasting between 40 and 54 minutes. This level of service is determined by the total time spent on the date of the encounter. |
318 | $149 | $672 |
| Hospital follow-up visit, moderate complexity Follow-up hospital visit for an existing patient involving moderate medical decision making. The visit requires at least 35 minutes of time spent on the date of service. |
289 | $65 | $284 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
287 | $100 | $481 |
| Intravenous injection of additional new drug or substance Administration of an additional new medication or substance directly into a vein. |
272 | $14 | $93 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
254 | $121 | $606 |
| Telephone medical discussion, 11-20 minutes A phone conversation with a physician lasting between 11 and 20 minutes. |
174 | $53 | $341 |
| Hospital follow-up visit, high complexity Subsequent hospital inpatient or observation care for an existing patient involving high-level medical decision making, with at least 50 minutes total time on the date of the encounter. |
154 | $99 | $410 |
| Drug injection, under skin or into muscle A procedure involving the administration of a medication or substance via injection into the subcutaneous tissue or muscle. |
145 | $12 | $81 |
| Initial hospital admission, high complexity Initial hospital inpatient or observation care for a new patient involving high-level medical decision making, with at least 75 minutes total time on the date of the encounter. |
127 | $144 | $630 |
| Leuprolide acetate (for depot suspension), 7.5 mg | 124 | $133 | $607 |
| Intravenous infusion of new drug or substance, 1 hour or less This procedure involves administering a new medication or substance directly into a vein through an existing access site. The infusion is completed within one hour or less. |
93 | $59 | $295 |
| Subcutaneous or intramuscular chemotherapy injection This procedure involves administering anti-cancer hormonal medication through an injection into the tissue under the skin or into a muscle. |
72 | $31 | $134 |
| Additional hour of intravenous chemotherapy This code represents the administration of chemotherapy medication into a vein for each additional hour beyond the initial period. |
68 | $26 | $134 |
| Telephone medical discussion, 21-30 minutes A telephone conversation with a physician lasting between 21 and 30 minutes. This code covers the time spent discussing medical matters over the phone. |
68 | $81 | $479 |
| New patient office visit, complex (60-74 min) | 48 | $177 | $821 |
| Diphenhydramine injection, up to 50 mg An injection of diphenhydramine hydrochloride, an antihistamine medication, administered in a dose of up to 50 milligrams. |
47 | $1 | $3 |
| Intravenous infusion, 1 hour or less Administration of medication or fluid directly into a vein for therapeutic, preventive, or diagnostic purposes. The procedure lasts one hour or less. |
46 | $53 | $269 |
| Blood sample collection from implanted device This procedure involves drawing a blood sample directly from a medical device that has been surgically placed in the body. |
39 | $25 | $109 |
| On-body injector for subcutaneous injection A device is applied to the skin to automatically deliver a medication injection under the skin. |
38 | $17 | $81 |
| Additional sequential IV infusion, 1 hour or less This code represents an additional intravenous infusion administered sequentially to a primary infusion. It covers the administration time of one hour or less. |
35 | $26 | $147 |
| Unclassified drug A medication that does not fit into standard HCPCS or CPT classification categories. |
31 | $1 | $23 |
| Additional hour of intravenous infusion This code represents each additional hour of intravenous infusion beyond the initial hour for therapy, prevention, or diagnosis. |
25 | $18 | $88 |
| Irrigation of implanted venous access device This procedure involves flushing an implanted venous access device to clear blockages or maintain patency. It ensures the device remains functional for delivering medications or fluids. |
24 | $24 | $103 |
| Vitamin B-12 injection An injection of vitamin B-12 (cyanocobalamin) with a dose of up to 1000 mcg. |
16 | $1 | $5 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. These counts do not measure clinical quality or years of experience.
0.8% high complexity
96.1% medium
3.0% routine
Industry Payment Transparency
Open Payments through 2024 ↗$14,302
Total received (2018-2024)
Avg $2,043/year across 7 years
Top 27% in CA for hematology & oncology
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
35
Companies
135
Payment records
Payments are publicly reported; disclosure does not establish legality · Not evidence of wrongdoing · How to interpret →
Payment categories are unavailable while the source breakdown is being rebuilt. Company and year totals do not identify how much belongs to each category.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$5,467
2023
$536
2022
$2,005
2021
$2,455
2020
$2,160
2019
$774
2018
$906
Payments by company (2024)
GENZYME CORPORATION
$2,921
AstraZeneca Pharmaceuticals LP
$2,220
Kite Pharma, Inc.
$150
ImmunoGen, Inc.
$87
INTUITIVE SURGICAL, INC.
$56
Celgene Corporation
$17
Takeda Pharmaceuticals U.S.A., Inc.
$16
Top 3 companies account for 96.8% of 2024 payments
All-time payments by company (2018-2024) ›
AstraZeneca Pharmaceuticals LP
$4,323
Novartis Pharmaceuticals Corporation
$3,556
GENZYME CORPORATION
$3,531
Genentech USA, Inc.
$349
PFIZER INC.
$275
E.R. Squibb & Sons, L.L.C.
$222
BeiGene USA, Inc.
$220
GlaxoSmithKline, LLC.
$215
Amgen Inc.
$188
Kite Pharma, Inc.
$150
JAZZ PHARMACEUTICALS INC.
$144
Seattle Genetics, Inc.
$129
ImmunoGen, Inc.
$87
Merck Sharp & Dohme Corporation
$86
Array BioPharma Inc.
$81
Takeda Pharmaceuticals U.S.A., Inc.
$71
Puma Biotechnology, Inc.
$63
Janssen Biotech, Inc.
$58
INTUITIVE SURGICAL, INC.
$56
Regeneron Healthcare Solutions, Inc.
$51
Gilead Sciences, Inc.
$46
Bayer HealthCare Pharmaceuticals Inc.
$46
Boehringer Ingelheim Pharmaceuticals, Inc.
$44
Eisai Inc.
$42
Foundation Medicine, Inc.
$41
Incyte Corporation
$36
Sirtex Medical Inc
$28
TESARO, Inc.
$28
Pharmacyclics LLC, An AbbVie Company
$24
Antares Pharma, Inc.
$24
Clovis Oncology, Inc.
$21
Seagen Inc.
$18
BTG International, Inc.
$17
Celgene Corporation
$17
INSYS Therapeutics Inc
$15
Top 3 companies account for 79.8% of all-time payments
Associated products mentioned in payments ›
ADCETRIS · Aliqopa · Aranesp · Avastin · BAVENCIO · BRUKINSA · Braftovi · CABLIVI · DARZALEX · DEFITELIO · Da Vinci Surgical System · ELAHERE · ELIQUIS · ELITEK · EMPLICITI · FOUNDATIONONE · FRUZAQLA · GILOTRIF · Halaven · IBRANCE · INLYTA · Imbruvica · JAKAFI · KEYTRUDA · Kyprolis · LIBTAYO · LORBRENA · LYNPARZA · Lenvima · MEKINIST · NINLARO · Nerlynx · Neulasta · OPDIVO · Otrexup · PIQRAY · PROMACTA · Perjeta · REBLOZYL · Rubraca · SANDOSTATIN · SARCLISA · SIR-Spheres Microspheres · SUTENT · SYNDROS · Stivarga · TABRECTA · TAGRISSO · TALZENNA · TECENTRIQ · VORAXAZE · XALKORI · XTANDI · Yescarta · ZEJULA
Should you be concerned? Industry payments are disclosed through CMS Open Payments. Disclosure alone does not establish their purpose, legality, or effect on care. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Geographic Context
Hematology & oncology specialists in nearby ZIP areas
286
County median income
$87,760
Nearest hospital to ZIP centroid (approximate)
KAISER FOUNDATION HOSPITAL - PANORAMA CITY
3.1 mi
3.1 mi
Data Sources
| Provider Registry | ✓ NPPES | NPPES snapshot; verify current record |
| Medicare Enrollment | ✓ PECOS | PECOS snapshot |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not included | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Leach is a mixed practice specialist, with above-average Medicare volume (top 14% in CA).
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Leach experienced with darbepoetin injection (aranesp) for anemia?
Based on Medicare claims data, Dr. Leach performed 15,700 darbepoetin injection (aranesp) for anemia services. These records cover Medicare fee-for-service activity, including eligible younger beneficiaries; they do not measure total practice volume or clinical quality.
Does Dr. Leach receive payments from pharmaceutical companies?
Yes. Dr. Leach received a total of $14,302 from 35 companies across 135 payment records. A record can group multiple payments. These transfers are publicly disclosed through CMS Open Payments. Disclosure alone does not establish their legality or effect on care. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Leach's costs compare to other hematology & oncology specialists in Mission Hills?
Dr. Leach's average Medicare payment per service is $18. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Leach) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating the presence of registry, enrollment, activity or payment records, not verified experience or clinical quality. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Source publication dates and the snapshots loaded on this site can differ. Rebuilding a page does not refresh its source records. Check the Medicare reporting year and the payment interval shown above; consult the linked official sources for newer releases and current registry details. See our data freshness policy →
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About this page
This page combines public CMS records with calculated summaries and explanatory procedure labels. These transformations are not verbatim federal records. Sources: NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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