Medicare Enrolled
Dr. Kelly Khai Li Yap, M.D.
Hematology & Oncology · South Pasadena, CA
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Low-engagement
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. Yap 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. Yap
Dr. Kelly Khai Li Yap is a hematology & oncology specialist in South Pasadena, CA, with 15 years of NPI registration. Based on federal Medicare data, Dr. Yap performed 49,881 Medicare services across 1,548 unique beneficiaries.
Between the years covered by Open Payments, Dr. Yap received a total of $2,338 from 23 pharmaceutical and/or device companies across 73 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in hematology & oncology. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Yap 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.
✓ 15 years in practice
▲ Top 15% volume in CA
$2,338 industry payments
Medicare Practice Summary
Medicare Utilization ↗49,881
Medicare services
Top 15% in CA for hematology & oncology
1,548
Unique beneficiaries
$7
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~3,325 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 |
|---|---|---|---|
| Oxaliplatin chemotherapy injection This procedure involves the administration of oxaliplatin, a chemotherapy medication, via injection. The dosage specified is 0.5 mg. |
17,280 | $0 | $0 |
| Anti-nausea injection (aprepitant) | 11,180 | $1 | $6 |
| Paclitaxel chemotherapy injection | 7,026 | $0 | $0 |
| Denosumab injection (Prolia/Xgeva) | 4,200 | $18 | $82 |
| Anti-nausea injection (ondansetron/Zofran) | 2,168 | $0 | $0 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
1,512 | $0 | $0 |
| Injection, leucovorin calcium, per 50 mg | 1,413 | $3 | $14 |
| Fluorouracil injection, 500 mg Administration of a 500 mg dose of fluorouracil medication via injection. |
996 | $2 | $8 |
| 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 | $83 | $373 |
| Intravenous injection of additional new drug or substance Administration of an additional new medication or substance directly into a vein. |
444 | $14 | $93 |
| 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. |
444 | $102 | $481 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
296 | $121 | $606 |
| Carboplatin chemotherapy injection, 50 mg Administration of a 50 mg dose of carboplatin, a chemotherapy medication, via injection. |
243 | $2 | $9 |
| Zoledronic acid injection, 1 mg An injection of zoledronic acid administered at a dose of 1 mg. |
226 | $6 | $31 |
| Additional hour of intravenous chemotherapy This code represents the administration of chemotherapy medication into a vein for each additional hour beyond the initial period. |
139 | $26 | $134 |
| 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. |
138 | $59 | $295 |
| 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. |
127 | $12 | $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. |
121 | $26 | $147 |
| 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. |
116 | $72 | $341 |
| 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. |
105 | $56 | $269 |
| 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. |
105 | $146 | $672 |
| Unclassified drug A medication that does not fit into standard HCPCS or CPT classification categories. |
104 | $1 | $23 |
| Diphenhydramine injection, up to 50 mg An injection of diphenhydramine hydrochloride, an antihistamine medication, administered in a dose of up to 50 milligrams. |
102 | $1 | $4 |
| 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. |
95 | $25 | $109 |
| IV chemotherapy initiation with community continuation Initiation of an intravenous chemotherapy infusion in a clinic using clinic supplies, with continuation of the infusion in a community setting such as home or assisted living. |
88 | $155 | $448 |
| 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. |
73 | $31 | $134 |
| 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. |
69 | $100 | $430 |
| 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. |
62 | $12 | $69 |
| 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. |
61 | $66 | $281 |
| Concurrent intravenous infusion Administration of medication or fluid into a vein for therapy, prevention, or diagnosis while another infusion is being given. |
60 | $18 | $84 |
| New patient office visit, complex (60-74 min) | 58 | $186 | $821 |
| 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. |
40 | $30 | $220 |
| On-body injector for subcutaneous injection A device is applied to the skin to automatically deliver a medication injection under the skin. |
36 | $17 | $81 |
| Additional hour of intravenous infusion This code represents each additional hour of intravenous infusion beyond the initial hour for therapy, prevention, or diagnosis. |
35 | $18 | $88 |
| Intravenous push injection of new drug or substance A healthcare provider injects a new medication or substance directly into a vein using a push technique. |
35 | $51 | $247 |
| 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. |
30 | $145 | $630 |
| Prochlorperazine injection, up to 10 mg An injection of prochlorperazine administered in a dose of up to 10 mg. |
25 | $2 | $10 |
| 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. |
25 | $2 | $9 |
| Injection, hydrocortisone sodium succinate, up to 100 mg | 22 | $14 | $62 |
| 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. |
16 | $24 | $103 |
| Prolonged office E/M service, first 15 minutes This code is used for additional time spent by a physician beyond the maximum required time of a primary office or outpatient evaluation and management service. It is billed in 15-minute increments based on total time spent on the date of the primary service. |
14 | $27 | $118 |
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.
1.6% high complexity
96.0% medium
2.4% routine
Industry Payment Transparency
Open Payments through 2024 ↗$2,338
Total received (2018-2024)
Avg $334/year across 7 years
Bottom 46% in CA for hematology & oncology
23
Companies
73
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.
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$1,280 (54.8%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$559 (23.9%)
Other
Charitable contributions, space rental, and other categories
$498 (21.3%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$22
2023
$322
2022
$411
2021
$254
2020
$392
2019
$908
2018
$29
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
AstraZeneca Pharmaceuticals LP
$22
Top 3 companies account for 100.0% of 2024 payments
All-time payments by company (2018-2024) ›
Amgen Inc.
$326
NOVARTIS PHARMACEUTICALS CORPORATION
$299
Novartis Pharmaceuticals Corporation
$220
Astellas Pharma US Inc
$209
Novocure GmbH
$200
Genentech USA, Inc.
$194
Athenex Pharmaceutical Division, LLC
$175
E.R. Squibb & Sons, L.L.C.
$110
Janssen Biotech, Inc.
$103
PFIZER INC.
$92
AstraZeneca Pharmaceuticals LP
$91
Celgene Corporation
$47
Gilead Sciences, Inc.
$37
GENZYME CORPORATION
$34
Bayer HealthCare Pharmaceuticals Inc.
$29
Incyte Corporation
$25
Seagen Inc.
$24
Foundation Medicine, Inc.
$24
Daiichi Sankyo Inc.
$23
Merck Sharp & Dohme Corporation
$22
MorphoSys, US Inc.
$20
Puma Biotechnology, Inc.
$18
EISAI INC.
$15
Top 3 companies account for 36.1% of all-time payments
Associated products mentioned in payments ›
ADCETRIS · CABLIVI · DARZALEX · EMPLICITI · ENHERTU · ERLEADA · EVENITY · Enhertu · Erleada · FOUNDATIONONE · INREBIC · KANJINTI · KEYTRUDA · KISQALI · Kadcyla · Kyprolis · LIBTAYO · LORBRENA · LUMAKRAS · LYNPARZA · Lenvima · MONJUVI · MVASI · Nerlynx · Neulasta · Nplate · ONUREG · OPDIVO · PADCEV · Perjeta · TAGRISSO · TECENTRIQ · Trodelvy · XTANDI · Xofigo
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 →
Most payments (55%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
Hematology & oncology specialists within 10 mi
402
Per 100K population
4.1
County median income
$87,760
Nearest hospital
ALHAMBRA HOSPITAL MEDICAL CENTER
2.1 mi
2.1 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. Yap is a mixed practice specialist, with above-average Medicare volume (top 15% in CA), with low-engagement industry engagement, with 15 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. Yap experienced with oxaliplatin chemotherapy injection?
Based on Medicare claims data, Dr. Yap performed 17,280 oxaliplatin chemotherapy injection 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. Yap receive payments from pharmaceutical companies?
Yes. Dr. Yap received a total of $2,338 from 23 companies across 73 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. Yap's costs compare to other hematology & oncology specialists in South Pasadena?
Dr. Yap's average Medicare payment per service is $7. 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. Yap) 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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