Antineoplastic AgentsAntineoplastic Combined Chemotherapy ProtocolsCisplatin
Dr. Stephen Leong, MD
NPI1194862466
- Medicare services, 2020
- 136
- Part D claims, 2020
- 76
- Publications
- 41
- Clinical trials
- 10
- Industry payments
- $18,012
- Practice address
- 6767 29th St, Greeley, CO 80634
- Practice phone
- Call (720) 848-0000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Leong's professional email, personal email and mobile number
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Dr. Stephen Leong is a medical oncologist in Greeley, Colorado
Dr. Leong practices in Greeley, Colorado.
Dr. Leong's NPI, 1194862466, was assigned on January 30, 2007. Dr. Leong holds Colorado license 45455.
NPI and contact details
- NPI
- 1194862466NPI Registry (opens in a new tab)
- NPI enumeration date
- January 30, 2007
- NPI status
- Active
- Practice phone
- (720) 848-0000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Stephen Leong's practice address is in Greeley, Colorado
Dr. Leong's practice address in the NPI Registry is 6767 29th St, Greeley, CO 80634, in Weld County. The practice phone is (720) 848-0000.
- NPI Registry address6767 29th St, Greeley, CO 80634 · Weld CountyPhone(720) 848-0000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Stephen Leong's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Leong practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Leong's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Stephen Leong is one of 91 medical oncologists in Colorado
Medical oncology is Dr. Leong's primary specialty in the NPI Registry, under taxonomy code 207RX0202X. Dr. Leong is licensed in Colorado.
Specialties and state licenses
- Medical oncology, ColoradoPrimary
Medical oncologists near Dr. Leong
Counts of medical oncologists with a Dmand AI profile, by place and practice. Each opens the list.
91medical oncologists in Colorado
8medical oncologists in Greeley
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Stephen Leong billed Medicare for 136 services in 2020
CMS data shows 136 Medicare services from Dr. Leong across 3 procedure codes in 2020, all of them office visits. Medicare paid $10,951 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2020136
Paid by Medicare$10,951
Procedure codes3
Dr. Leong's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Office and hospital visits
- 2019: 3342020: 13659%
Dr. Leong compared with the Colorado median for medical oncologists, 2020
- Dr. Leong
- Colorado median
- Medicare services
- 136vs 30656% below
- Part D claims
- 76vs 24269% below
Medians across 90 medical oncologists in Colorado with Dmand AI profiles that report each measure.
Dr. Leong's most billed Medicare procedure codes, 2020
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Stephen Leong's patients have a median age of 51
Across all payers, Dmand AI patient panel data puts Dr. Leong's median patient age at 51, with 0% women.
Dr. Leong's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 51
Patient panel by sex, all payers
- Women0%
- Men100%
Source: Dmand AI Patient Panel Data
Dr. Stephen Leong wrote 76 Medicare Part D claims in 2020
In 2020, Dr. Leong wrote 76 Medicare Part D claims. They cover 4 drugs, with $210,080 in total drug cost. In 2019, CMS named 137 claims across 8 drugs.
Part D claims, 202076
Drugs named by CMS4
Total drug cost$210,080
Dr. Leong's most prescribed drugs by claims, 2020
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 1372020: 7645%
Drugs named by CMS: 4 in 2020, 8 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Stephen Leong has 41 publications on record
Dmand AI links 41 papers to Dr. Leong, published from 2009 to 2022. 2020 was the busiest year, with 6. The most frequent topics are Antineoplastic Agents, Antineoplastic Combined Chemotherapy Protocols and Adenocarcinoma. Dr. Leong has published most often in Clin Cancer Res. Dr. Leong's most frequent co-authors are Wells A. Messersmith, MD, Jennifer R. Diamond, MD and Katja Kiseljak-Vassiliades, DO.
Papers41
Years published2009 to 2022
Dr. Leong's papers by year, 2012 to 2022
Topics Dr. Leong writes about most
- Antineoplastic Agents
- Antineoplastic Combined Chemotherapy Protocols
- Adenocarcinoma
- Adrenocortical Carcinoma
- Cell Line, Tumor
- Esophageal Neoplasms
- Colorectal Neoplasms
- Esophagogastric Junction
Dr. Leong's most frequent co-authors
- Wells A. Messersmith, MD6 shared papers
- Jennifer R. Diamond, MD5 shared papers
- Katja Kiseljak-Vassiliades, DO5 shared papers
Recent publications by Dr. Leong
Adrenal Cortex NeoplasmsAdrenocortical CarcinomaGenomics
AdenocarcinomaChemoradiotherapyEsophageal Neoplasms
JCO Precis Oncol
Antineoplastic AgentsBenzimidazolesCarboplatin
See who Dr. Leong researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Leong works with, so you can find a warm path to the right medical oncologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Stephen Leong has worked on 10 clinical trials
Dmand AI links Dr. Leong to 10 clinical trials, 4 of them phase 2 studies. 3 are still active or recruiting. Conditions studied include Somatostatinoma, Carcinoma, Islet Cell and Carcinoma, Transitional Cell. National Cancer Institute (NCI) sponsors the most, 3. Open Payments lists research payments to Dr. Leong that name 3 trials.
Clinical trials with Dr. Leong by phase
- 1Phase 1: 1 trial
- 2Phase 1/2: 2 trials
- 4Phase 2: 4 trials
- NonePhase 3: no trials
- NonePhase 4: no trials
Conditions in Dr. Leong's trials
- Somatostatinoma
- Carcinoma, Islet Cell
- Carcinoma, Transitional Cell
- Gastro-enteropancreatic neuroendocrine tumor
- Melanoma
Investigators on the most trials with Dr. Leong
- Martin Eduardo Gutierrez, MD2 shared trials
- Manisha H. Shah, MD2 shared trials
- John Daniel Abad, MD1 shared trial
Recent clinical trials with Dr. Leong
Phase I Study of TRC102 in Combination With Cisplatin and Pemetrexed in Patients With Advanced Solid Tumors / Phase II Study of TRC102 With Pemetrexed in Patients Refractory to Pemetrexed and Cisplatin or Carboplatin (opens in a new tab)
Active, not recruitingPhase 1/2
Mesothelioma, MalignantPleural NeoplasmsCisplatinMethoxyaminePemetrexed Disodium
A Phase 2 Trial of the CDK4/6 Inhibitor Abemaciclib in Patients With Advanced and Refractory Well-Differentiated Gastroenteropancreatic Neuroendocrine Tumors (GEP NETs) (opens in a new tab)
Active, not recruitingPhase 2
Gastro-enteropancreatic neuroendocrine tumorAdenoma, Islet CellAbemaciclib
Randomized Phase II Study of Cisplatin and Etoposide Versus Temozolomide and Capecitabine in Patients With Advanced G3 Non-small Cell Gastroenteropancreatic Neuroendocrine Carcinomas (opens in a new tab)
Active, not recruitingPhase 2
SomatostatinomaCarcinoma, Islet CellCapecitabineCisplatinEtoposide
MelanomaNevi and MelanomasKPT-9274Niacin ERNivolumab
A Phase II Study of MLN0128 (TAK-228) in Rapalog-Resistant Advanced Pancreatic Neuroendocrine Tumors (PNET) (opens in a new tab)
CompletedPhase 2
SomatostatinomaCarcinoma, Islet CellSapanisertib
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Stephen Leong received $18,012 in industry payments from 2016 to 2024
CMS Open Payments shows 24 general payments to Dr. Leong from 7 drug and device companies from 2016 to 2024. Consulting fees make up the largest share, 56% of the total. Eli Lilly and Company paid the most, $10,325. It also lists 3 research payments totaling $853 from 2018 to 2019, naming 3 clinical trials.
General payments to Dr. Leong by program year, 2016 to 2024
General payments to Dr. Leong by kind, 2016 to 2024
$18Kin total
- Consulting fees$10,13156%
- Speaker and faculty fees$4,91027%
- Travel and lodging$2,13812%
- Food and beverage$8325%
Companies that paid Dr. Leong the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Stephen Leong's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Stephen Leong
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Stephen Leong's NPI number?
Dr. Stephen Leong's NPI number is 1194862466. It was assigned on January 30, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Stephen Leong?
Dr. Stephen Leong is a medical oncologist in Greeley, Colorado. The primary specialty in the NPI Registry is Medical Oncology Physician (taxonomy code 207RX0202X).
Where does Dr. Stephen Leong practice?
Dr. Leong practices at 6767 29th St, Greeley, CO 80634.
What is Dr. Stephen Leong's office phone number?
The practice phone on file for Dr. Leong is (720) 848-0000.
What is Dr. Stephen Leong's medical license number?
Dr. Leong holds Colorado license 45455.
Does Dr. Stephen Leong accept Medicare?
Yes. CMS data shows Dr. Leong billed Medicare for 136 services in 2020.
What services does Dr. Stephen Leong bill to Medicare?
In 2020, Dr. Leong's most billed Medicare services were office visit, established patient (99215), office visit, established patient (99214) and office visit, new patient (99205).
What drugs does Dr. Stephen Leong prescribe most?
In 2020 Medicare Part D data, Dr. Leong's most prescribed drugs by claims were Creon, Prochlorperazine Maleate and Oxycodone HCl.
Has Dr. Stephen Leong received payments from drug or device companies?
CMS Open Payments shows $18,012 in general payments to Dr. Leong from 7 companies from 2016 to 2024. The largest total came from Eli Lilly and Company.
How long has Dr. Stephen Leong been practicing?
Dr. Leong's NPI was assigned in 2007.
Does Dr. Stephen Leong do research?
Dmand AI links 41 publications to Dr. Leong, published from 2009 to 2022. Dr. Leong has worked on 10 clinical trials.
Who does Dr. Stephen Leong publish with?
Dr. Leong's most frequent co-authors are Wells A. Messersmith, MD (6 shared papers), Jennifer R. Diamond, MD (5 shared papers) and Katja Kiseljak-Vassiliades, DO (5 shared papers).
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