Medicare Enrolled
Dr. Gigi Chen, M.D.
Hematology & Oncology · Pleasant Hill, CA
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Consulting-driven
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. Chen 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. Chen
Dr. Gigi Chen is a hematology & oncology specialist in Pleasant Hill, CA, with 20 years of NPI registration. Based on federal Medicare data, Dr. Chen performed 104,768 Medicare services across 2,823 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chen received a total of $101,333 from 80 pharmaceutical and/or device companies across 549 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in hematology & oncology. The majority of payments are for consulting, which typically reflects recognized clinical expertise sought by manufacturers. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Chen 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.
✓ 20 years in practice
▲ Top 7% volume in CA
$101,333 industry payments
Medicare Practice Summary
Medicare Utilization ↗104,768
Medicare services
Top 7% in CA for hematology & oncology
2,823
Unique beneficiaries
$21
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~5,238 Medicare services per year of practice
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 |
|---|---|---|---|
| Pembrolizumab injection (Keytruda) | 33,000 | $43 | $126 |
| Anti-nausea injection (fosaprepitant) An injection of fosaprepitant, a medication used to prevent nausea and vomiting. |
23,250 | $0 | $6 |
| Iron infusion (Injectafer) An intravenous injection of ferric carboxymaltose, an iron replacement medication. |
16,330 | $1 | $4 |
| Denosumab injection (Prolia/Xgeva) | 9,421 | $19 | $54 |
| Epoetin alfa injection (Procrit) for anemia An injection of epoetin alfa containing 1000 units for use in patients not on end-stage renal disease (ESRD) dialysis. |
7,720 | $6 | $45 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
2,496 | $0 | $1 |
| Anti-nausea injection (Aloxi/palonosetron) | 1,930 | $1 | $99 |
| 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. |
1,315 | $111 | $305 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
975 | $8 | $15 |
| Complete blood count (CBC) with differential An automated laboratory test that measures the levels of red blood cells, white blood cells, and platelets in the blood, including a breakdown of the different types of white blood cells. |
944 | $8 | $44 |
| 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. |
822 | $81 | $1,074 |
| Comprehensive metabolic blood panel A blood test that measures a group of chemicals, including glucose, electrolytes, and kidney and liver function markers. |
701 | $10 | $58 |
| 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. |
582 | $161 | $406 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
501 | $138 | $514 |
| 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. |
480 | $13 | $75 |
| Carboplatin chemotherapy injection, 50 mg Administration of a 50 mg dose of carboplatin, a chemotherapy medication, via injection. |
475 | $2 | $26 |
| Intravenous injection of additional new drug or substance Administration of an additional new medication or substance directly into a vein. |
458 | $16 | $79 |
| 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. |
450 | $30 | $113 |
| 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. |
249 | $71 | $222 |
| Normal saline infusion, 1000 cc Administration of 1000 cc of normal saline solution into a vein. This procedure involves the intravenous delivery of a sterile saltwater solution. |
223 | $2 | $9 |
| Magnesium sulfate injection, per 500 mg An injection of magnesium sulfate administered in 500 mg increments. |
218 | $1 | $5 |
| 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. |
209 | $66 | $251 |
| Normal saline infusion, 250 cc Administration of 250 cubic centimeters of normal saline solution into a vein. This procedure involves the intravenous delivery of a sterile saltwater fluid. |
190 | $0 | $15 |
| Diphenhydramine injection, up to 50 mg An injection of diphenhydramine hydrochloride, an antihistamine medication, administered in a dose of up to 50 milligrams. |
171 | $1 | $4 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
152 | $75 | $210 |
| Additional hour of intravenous chemotherapy This code represents the administration of chemotherapy medication into a vein for each additional hour beyond the initial period. |
142 | $29 | $111 |
| Non-hormonal chemotherapy injection This procedure involves administering non-hormonal anti-neoplastic chemotherapy medication via injection into the skin or muscle tissue. |
140 | $76 | $207 |
| Lactate dehydrogenase (LDH) level test A blood test that measures the amount of lactate dehydrogenase, an enzyme found in many body tissues. It helps assess tissue damage or disease. |
134 | $6 | $27 |
| Ferritin level test (iron stores) A blood test that measures the level of ferritin, a protein that stores iron in the body. |
121 | $13 | $65 |
| Intravenous hydration infusion, 31-60 minutes Administration of fluids into a vein to maintain hydration. This procedure involves an infusion lasting between 31 and 60 minutes. |
111 | $34 | $197 |
| 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. |
103 | $25 | $90 |
| 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. |
92 | $65 | $244 |
| Additional hour of intravenous hydration This code represents each additional hour of intravenous fluid administration beyond the initial hour. It is used to bill for extended hydration therapy. |
90 | $13 | $64 |
| Vitamin B-12 injection An injection of vitamin B-12 (cyanocobalamin) with a dose of up to 1000 mcg. |
87 | $1 | $13 |
| Immunologic analysis for detection of tumor antigen, quantitative; ca 125 | 82 | $20 | $97 |
| Additional hour of intravenous infusion This code represents each additional hour of intravenous infusion beyond the initial hour for therapy, prevention, or diagnosis. |
72 | $21 | $80 |
| On-body injector for subcutaneous injection A device is applied to the skin to automatically deliver a medication injection under the skin. |
53 | $18 | $91 |
| Thyroid stimulating hormone (TSH) test A blood test that measures the level of thyroid stimulating hormone to evaluate thyroid function. |
45 | $16 | $70 |
| Uric acid level test A blood test that measures the level of uric acid in your body. Uric acid is a waste product formed when the body breaks down purines. |
43 | $4 | $20 |
| New patient office visit, complex (60-74 min) | 37 | $198 | $569 |
| 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. |
27 | $108 | $347 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
25 | $130 | $461 |
| Venipuncture for blood collection A procedure to draw blood from a vein for medical testing or analysis. |
23 | $100 | $279 |
| Carcinoembryonic antigen (CEA) level test A blood test that measures the level of carcinoembryonic antigen (CEA) protein. This test is used to monitor certain types of cancer. |
22 | $19 | $87 |
| Magnesium level test A blood test to measure the amount of magnesium in your body. This helps check for magnesium deficiency or excess. |
22 | $7 | $44 |
| Hospital follow-up visit, low complexity Follow-up hospital visit for an established patient with straightforward or low-level medical decision making. The visit requires at least 25 minutes of time spent on the day of service. |
18 | $42 | $145 |
| 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. |
17 | $152 | $585 |
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. A higher procedure volume generally indicates more experience with that procedure.
17.4% high complexity
77.2% medium
5.5% routine
Industry Payment Transparency
Open Payments through 2024 ↗$101,333
Total received (2018-2024)
Avg $14,476/year across 7 years
Top 8% in CA for hematology & oncology
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
80
Companies
549
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →
Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Consulting
Expert advisory fees, typically reflecting recognized clinical expertise
$57,958 (57.2%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$34,933 (34.5%)
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$8,442 (8.3%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$4,528
2023
$13,596
2022
$22,139
2021
$8,424
2020
$10,004
2019
$28,339
2018
$14,303
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Kite Pharma, Inc.
$2,080
E.R. Squibb & Sons, L.L.C.
$961
ABBVIE INC.
$203
Celgene Corporation
$163
PFIZER INC.
$161
Novartis Pharmaceuticals Corporation
$115
Janssen Biotech, Inc.
$105
ADC Therapeutics America, Inc.
$102
Merck Sharp & Dohme LLC
$85
GlaxoSmithKline, LLC.
$64
GENZYME CORPORATION
$49
Daiichi Sankyo Inc.
$35
Ipsen Biopharmaceuticals, Inc
$33
Immunocore Limited
$32
Genentech USA, Inc.
$30
Takeda Pharmaceuticals U.S.A., Inc.
$29
Lilly USA, LLC
$27
AstraZeneca Pharmaceuticals LP
$27
Exelixis Inc.
$27
Tactile Systems Technology Inc
$25
SERVIER PHARMACEUTICALS LLC
$24
ACCORD HEALTHCARE, INC.
$22
Astellas Pharma US Inc
$22
Gilead Sciences, Inc.
$22
Genmab U.S., Inc.
$22
SpringWorks Therapeutics, Inc.
$22
Deciphera Pharmaceuticals Inc.
$21
BeiGene USA, Inc.
$21
Top 3 companies account for 71.7% of 2024 payments
All-time payments by company (2018-2024) ›
TESARO, Inc.
$22,969
AstraZeneca Pharmaceuticals LP
$17,668
GlaxoSmithKline, LLC.
$11,340
Kite Pharma, Inc.
$7,583
E.R. Squibb & Sons, L.L.C.
$7,562
Genentech, Inc.
$5,031
Bayer HealthCare Pharmaceuticals Inc.
$4,625
Celgene Corporation
$4,576
Exelixis Inc.
$2,936
ABBVIE INC.
$2,403
Karyopharm Therapeutics Inc.
$2,250
Seattle Genetics, Inc.
$1,695
Puma Biotechnology, Inc.
$1,194
Rigel Pharmaceuticals, Inc.
$1,020
Gilead Sciences, Inc.
$882
Immunomedics, Inc.
$800
Janssen Biotech, Inc.
$719
Amgen Inc.
$655
PFIZER INC.
$596
Pharmacyclics LLC, An AbbVie Company
$318
Novartis Pharmaceuticals Corporation
$315
Lilly USA, LLC
$309
Daiichi Sankyo Inc.
$289
GENZYME CORPORATION
$281
Jazz Pharmaceuticals Inc.
$280
ADC Therapeutics America, Inc.
$244
Seagen Inc.
$222
Merck Sharp & Dohme LLC
$203
Genentech USA, Inc.
$153
Astellas Pharma US Inc
$142
Clovis Oncology, Inc.
$138
Takeda Pharmaceuticals U.S.A., Inc.
$130
Alexion Pharmaceuticals, Inc.
$120
Foundation Medicine, Inc.
$103
Incyte Corporation
$80
TerSera Therapeutics LLC
$70
Merck Sharp & Dohme Corporation
$64
Ethicon US, LLC
$62
Deciphera Pharmaceuticals Inc.
$62
ARRAY BIOPHARMA INC
$62
TAIHO ONCOLOGY, INC.
$59
ACELL, INC.
$59
EMD Serono, Inc.
$58
Pharmacyclics LLC, an AbbVie Company
$53
Tactile Systems Technology Inc
$51
AbbVie Inc.
$50
SOBI, INC
$49
Sobi, Inc
$46
Mirati Therapeutics, Inc.
$46
Myovant Sciences Inc.
$39
Alnylam Pharmaceuticals Inc.
$38
Eisai Inc.
$34
Ipsen Biopharmaceuticals, Inc
$33
Immunocore Limited
$32
PORTOLA PHARMACEUTICALS, INC.
$32
Regeneron Healthcare Solutions, Inc.
$31
Epizyme, Inc.,
$29
Sumitomo Pharma America, Inc.
$28
Blue Earth Diagnostics Limited
$27
Blueprint Medicines Corporation
$26
SERVIER PHARMACEUTICALS LLC
$24
Apellis Pharmaceuticals, Inc.
$23
ACCORD HEALTHCARE, INC.
$22
Genmab U.S., Inc.
$22
SpringWorks Therapeutics, Inc.
$22
BeiGene USA, Inc.
$21
Taiho Oncology, Inc.
$20
Novocure Inc.
$19
EISAI INC.
$19
Sun Pharmaceutical Industries Inc.
$18
AMAG Pharmaceuticals, Inc.
$18
Stemline Therapeutics Inc.
$18
Janssen Pharmaceuticals, Inc
$17
AbbVie, Inc.
$17
Boehringer Ingelheim Pharmaceuticals, Inc.
$16
Agios Pharmaceuticals, Inc.
$15
Advanced Accelerator Applications
$15
Emmaus Medical, Inc.
$14
TherapeuticsMD, Inc.
$13
NOVARTIS PHARMACEUTICALS CORPORATION
$12
Top 3 companies account for 51.3% of all-time payments
Associated products mentioned in payments ›
ABECMA · ADCETRIS · AFINITOR · AKEEGA · ALIMTA · ALUNBRIG · ANDEXXA · Abraxane · Aliqopa · Avastin · Axumin · BAVENCIO · BLENREP · BOSULIF · BRAFTOVI · BRUKINSA · Blincyto · CABLIVI · CABOMETYX · CALQUENCE · CAMCEVI · CARVYKTI · CYRAMZA · Cabometyx · DARZALEX · DOPTELET · Doptelet · ELIQUIS · ELITEK · ELREXFIO · ELZONRIS · EMPLICITI · ENHERTU · ENJAYMO · EPKINLY · ERLEADA · ETHICON ENDO-SURGERY Curved Intraluminal Stapler · EVENITY · Endari · Enhertu · Epkinly · Erleada · FASLODEX · FERAHEME · FOUNDATIONONE · Fabhalta · Flexitouch Plus · GAVRETO · GILOTRIF · GIVLAARI · IBRANCE · ICLUSIG · IMBRUVICA · IMFINZI · IMVEXXY · INJECTAFER · INLYTA · INREBIC · Imbruvica · Inrebic · JADENU · JAKAFI · JEVTANA · KANJINTI · KEYTRUDA · KIMMTRAK · KISQALI · KRAZATI · Kyprolis · LIBTAYO · LONSURF · LORBRENA · LUMAKRAS · LUTATHERA · LUTATHERA (lutetium Lu 177 dotatate) · LYNPARZA · Lenvima · Lunsumio · MEKINIST · MONJUVI · MYLOTARG · NINLARO · Nerlynx · Nexavar · Non-Covered Product · Nplate · Nubeqa · ODOMZO · OGSIVEO · ONUREG · OPDIVO · OPDUALAG · ORGOVYX · OXBRYTA · Oncology · Onivyde · PADCEV · PLUVICTO · Padcev · Perjeta · Pomalyst · Prolia · QINLOCK · REBLOZYL · RYBREVANT · Revlimid · Rubraca · SARCLISA · SCEMBLIX · SOLIRIS · SUTENT · Stivarga · TABRECTA · TAGRISSO · TASIGNA · TAZVERIK · TECENTRIQ · TEPMETKO · TIBSOVO · TUKYSA · Tavalisse · Tecentriq · Tibsovo · Trodelvy · VENCLEXTA · VERZENIO · VYXEOS · Vanflyta · Venclexta · Vitrakvi · XALKORI · XARELTO · XPOVIO · XTANDI · Yescarta · ZEJULA · ZEPZELCA · ZOLADEX
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. 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 →
The majority of payments (57%) are consulting fees, which typically reflect recognized clinical expertise sought by manufacturers. Total industry engagement is in the top 8% for hematology & oncology in CA.
Geographic Context
Hematology & oncology specialists within 10 mi
105
Per 100K population
9.0
County median income
$125,727
Nearest hospital
JOHN MUIR MEDICAL CENTER - CONCORD CAMPUS
3.5 mi
3.5 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | 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. Chen is a mixed practice specialist, with above-average Medicare volume (top 7% in CA), with consulting-driven industry engagement in the top 8% of CA peers, with 20 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Chen experienced with pembrolizumab injection (keytruda)?
Based on Medicare claims data, Dr. Chen performed 33,000 pembrolizumab injection (keytruda) services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Chen receive payments from pharmaceutical companies?
Yes. Dr. Chen received a total of $101,333 from 80 companies across 549 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. 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. Chen's costs compare to other hematology & oncology specialists in Pleasant Hill?
Dr. Chen's average Medicare payment per service is $21. 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. Chen) 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 a long track record of practice, Medicare participation, and industry disclosure. 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?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →
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About this page
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): 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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