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
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 →
Are you Dr. Yap?
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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 16 years of NPI registration. Based on federal Medicare data, Dr. Yap performed 49,881 Medicare services in 2023. These records do not provide a deduplicated patient total.
Between the years covered by Open Payments, Dr. Yap received a total of $2,338 from 23 pharmaceutical and/or device companies across 73 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. 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.
✓ 16 years of NPI registration
▲ Top 15% volume in CA
$2,338 industry payments
Medicare Practice Summary — 2023
Medicare Utilization ↗49,881
Medicare services
Top 15% in CA for hematology & oncology
Not available
Unique patients (not deduplicated)
$7
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 |
|---|---|---|---|
| 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. These counts do not measure clinical quality or years of experience.
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
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
$22
2023
$322
2022
$411
2021
$254
2020
$392
2019
$908
2018
$29
Payments by company (2024)
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? 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
402
County median income
$87,760
Nearest hospital to ZIP centroid (approximate)
ALHAMBRA HOSPITAL MEDICAL CENTER
2.1 mi
2.1 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. Yap is a mixed practice specialist, with above-average Medicare volume (top 15% in CA), with 16 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. These records cover Medicare fee-for-service activity, including eligible younger beneficiaries; they do not measure total practice volume or clinical quality.
Does Dr. Yap receive payments from pharmaceutical companies?
Yes. Dr. Yap received a total of $2,338 from 23 companies across 73 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. 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 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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