Medicare Enrolled
Dr. Christopher Chay, M.D.
Allergy & Immunology · Asheville, NC
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. Chay 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. Chay?
Request a correction or review of any data shown here. Provider portal →
What this data tells you about Dr. Chay
Dr. Christopher Chay is an allergy & immunology specialist in Asheville, NC, with 20 years of NPI registration. Based on federal Medicare data, Dr. Chay performed 80,668 Medicare services in 2023. These records do not provide a deduplicated patient total.
Between the years covered by Open Payments, Dr. Chay received a total of $7,396 from 54 pharmaceutical and/or device companies across 195 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. Chay 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 of NPI registration
▲ Top 1% volume in NC
$7,396 industry payments
Medicare Practice Summary — 2023
Medicare Utilization ↗80,668
Medicare services
Top 1% in NC for allergy & immunology
Not available
Unique patients (not deduplicated)
$22
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 |
|---|---|---|---|
| Pembrolizumab injection (Keytruda) | 12,600 | $43 | $157 |
| Nivolumab injection (Opdivo) | 10,800 | $24 | $88 |
| Denosumab injection (Prolia/Xgeva) | 7,260 | $18 | $64 |
| Paclitaxel chemotherapy injection | 6,483 | $0 | $2 |
| Anti-nausea injection (aprepitant) | 5,200 | $1 | $6 |
| Oxaliplatin chemotherapy injection This procedure involves the administration of oxaliplatin, a chemotherapy medication, via injection. The dosage specified is 0.5 mg. |
5,100 | $0 | $18 |
| Daratumumab injection (Darzalex) An injection containing daratumumab and hyaluronidase-fihj administered under the skin. |
4,320 | $38 | $136 |
| 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. |
3,870 | $6 | $25 |
| Bevacizumab-maly biosimilar injection, 10 mg An injection of bevacizumab-maly, a biosimilar medication, with a dosage of 10 mg. |
2,190 | $54 | $222 |
| Contrast dye for imaging (iodine-based) A contrast agent containing 300-399 mg/ml of iodine used to enhance imaging studies. It is administered per milliliter to improve the visibility of internal structures. |
2,108 | $0 | $1 |
| Bevacizumab-bvzr biosimilar injection, 10 mg An injection of bevacizumab-bvzr, a biosimilar medication, administered in a 10 mg dose. |
2,070 | $26 | $152 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
2,021 | $0 | $1 |
| Immune globulin infusion (Gammagard) An injection of immune globulin (Gammagard Liquid) to provide antibodies. The dose specified is 500 mg. |
1,895 | $36 | $141 |
| 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. |
1,705 | $8 | $29 |
| Iron infusion (Monoferric) | 1,700 | $16 | $74 |
| Bortezomib injection, 0.1 mg Administration of a 0.1 mg dose of bortezomib medication via injection. |
1,645 | $4 | $135 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
1,430 | $8 | $9 |
| Anti-nausea injection (ondansetron/Zofran) | 1,064 | $0 | $3 |
| Anti-nausea injection (Aloxi/palonosetron) | 850 | $1 | $41 |
| 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. |
517 | $91 | $390 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
509 | $94 | $421 |
| Injection, fulvestrant, 25 mg | 460 | $8 | $139 |
| 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. |
409 | $61 | $277 |
| Intravenous injection of additional new drug or substance Administration of an additional new medication or substance directly into a vein. |
355 | $11 | $66 |
| Enhanced Oncology Model monthly payment This code represents the monthly enhanced oncology services payment under the Enhancing Oncology Model. It covers the administrative payment for enhanced services provided to eligible patients. |
313 | $70 | $210 |
| Pegfilgrastim-apgf injection An injection of pegfilgrastim-apgf, a biosimilar medication. The dose specified is 0.5 mg. |
276 | $86 | $654 |
| 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. |
246 | $10 | $67 |
| Leuprolide acetate (for depot suspension), 7.5 mg | 224 | $134 | $603 |
| Injection, gemcitabine hydrochloride, not otherwise specified, 200 mg | 208 | $3 | $42 |
| Zoledronic acid injection, 1 mg An injection of zoledronic acid administered at a dose of 1 mg. |
205 | $6 | $126 |
| 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. |
201 | $21 | $103 |
| 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. |
197 | $131 | $550 |
| Carboplatin chemotherapy injection, 50 mg Administration of a 50 mg dose of carboplatin, a chemotherapy medication, via injection. |
179 | $2 | $39 |
| Fluorouracil injection, 500 mg Administration of a 500 mg dose of fluorouracil medication via injection. |
174 | $2 | $7 |
| Diphenhydramine injection, up to 50 mg An injection of diphenhydramine hydrochloride, an antihistamine medication, administered in a dose of up to 50 milligrams. |
147 | $1 | $4 |
| 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. |
118 | $24 | $135 |
| 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. |
111 | $45 | $208 |
| 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. |
102 | $2 | $9 |
| Principal care management for high-risk disease, first 30 minutes This service covers the initial 30 minutes of clinical staff time per calendar month to manage a single high-risk disease. It is directed by a healthcare professional. |
98 | $42 | $180 |
| 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. |
96 | $47 | $205 |
| Non-hormonal chemotherapy injection This procedure involves administering non-hormonal anti-neoplastic chemotherapy medication via injection into the skin or muscle tissue. |
91 | $52 | $234 |
| 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. |
91 | $60 | $214 |
| 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. |
86 | $9 | $40 |
| New patient office visit, complex (60-74 min) | 79 | $158 | $673 |
| Unclassified drug A medication that does not fit into standard HCPCS or CPT classification categories. |
70 | $1 | $21 |
| Urinalysis, manual A manual laboratory examination of a urine sample to check for various substances and cells. |
65 | $3 | $11 |
| 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. |
65 | $17 | $83 |
| 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. |
64 | $90 | $308 |
| Additional hour of intravenous infusion This code represents each additional hour of intravenous infusion beyond the initial hour for therapy, prevention, or diagnosis. |
57 | $15 | $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. |
55 | $24 | $105 |
| Additional hour of intravenous chemotherapy This code represents the administration of chemotherapy medication into a vein for each additional hour beyond the initial period. |
55 | $21 | $164 |
| Nuclear medicine scan from skull base to mid-thigh with CT A nuclear medicine imaging study covering the area from the base of the skull to the middle of the thighs, performed alongside a CT scan. |
43 | $1,084 | $4,455 |
| Office visit for established patient An office visit for an existing patient that may not require the healthcare professional to be present. |
43 | $16 | $71 |
| Intravenous drug injection A procedure involving the administration of a medication or substance directly into a vein. |
41 | $28 | $121 |
| Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose, up to 45 millicuries | 41 | $196 | $1,533 |
| 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. |
36 | $37 | $117 |
| 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. |
30 | $105 | $509 |
| Vitamin B-12 injection An injection of vitamin B-12 (cyanocobalamin) with a dose of up to 1000 mcg. |
30 | $1 | $6 |
| CT scan of abdomen and pelvis with contrast A CT scan that uses dye to create detailed images of the abdomen and pelvis. This imaging test helps doctors examine internal organs and structures in these areas. |
26 | $162 | $733 |
| CT scan of chest with contrast A computed tomography scan of the chest using a contrast dye to enhance the visibility of internal structures. |
24 | $47 | $368 |
| Venipuncture for blood collection A procedure to draw blood from a vein for medical testing or analysis. |
24 | $62 | $313 |
| 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. |
21 | $132 | $595 |
| 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. |
18 | $39 | $177 |
| New patient office visit (30-44 min) An initial office visit for a new patient lasting between 30 and 44 minutes. This code is used when the total time spent on the date of the encounter falls within this range. |
16 | $72 | $342 |
| 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. |
16 | $170 | $613 |
| Initial hospital admission, moderate complexity Initial hospital inpatient or observation care for a new patient involving moderate-level medical decision making, with at least 55 minutes total time on the date of the encounter. |
13 | $91 | $406 |
| 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. |
12 | $1 | $17 |
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.
5.9% high complexity
87.1% medium
7.0% routine
Industry Payment Transparency
Open Payments through 2024 ↗$7,396
Total received (2020-2024)
Avg $1,479/year across 5 years
Top 41% in NC for allergy & immunology
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
54
Companies
195
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
$2,153
2023
$3,647
2022
$933
2021
$612
2020
$50
Payments by company (2024)
Daiichi Sankyo Inc.
$843
Takeda Pharmaceuticals U.S.A., Inc.
$117
Novartis Pharmaceuticals Corporation
$110
Merck Sharp & Dohme LLC
$93
Janssen Biotech, Inc.
$87
AstraZeneca Pharmaceuticals LP
$86
Astellas Pharma US Inc
$70
Eisai Inc.
$66
BeiGene USA, Inc.
$66
E.R. Squibb & Sons, L.L.C.
$65
Alexion Pharmaceuticals, Inc.
$64
Genentech USA, Inc.
$55
GENZYME CORPORATION
$41
SERVIER PHARMACEUTICALS LLC
$39
Deciphera Pharmaceuticals Inc.
$33
Organon Llc
$31
Bayer Healthcare Pharmaceuticals Inc.
$27
Celgene Corporation
$26
ABBVIE INC.
$24
Incyte Corporation
$23
Exelixis Inc.
$22
Genmab U.S., Inc.
$21
SOBI, INC
$21
PFIZER INC.
$21
JAZZ PHARMACEUTICALS INC.
$19
Lilly USA, LLC
$19
PUMA BIOTECHNOLOGY, INC.
$17
Karyopharm Therapeutics Inc.
$15
Adaptive Biotechnologies Corporation
$15
TAIHO ONCOLOGY, INC.
$15
Top 3 companies account for 49.7% of 2024 payments
All-time payments by company (2020-2024) ›
Seagen Inc.
$1,652
Rigel Pharmaceuticals, Inc.
$1,024
Daiichi Sankyo Inc.
$882
Novartis Pharmaceuticals Corporation
$504
Janssen Biotech, Inc.
$462
AstraZeneca Pharmaceuticals LP
$250
Takeda Pharmaceuticals U.S.A., Inc.
$191
Merck Sharp & Dohme LLC
$152
Acera Surgical, Inc.
$148
E.R. Squibb & Sons, L.L.C.
$128
Eisai Inc.
$127
BeiGene USA, Inc.
$125
Deciphera Pharmaceuticals Inc.
$104
Astellas Pharma US Inc
$98
Amgen Inc.
$95
GENZYME CORPORATION
$92
Genentech USA, Inc.
$82
Celgene Corporation
$79
PFIZER INC.
$69
Merck Sharp & Dohme Corporation
$67
GlaxoSmithKline, LLC.
$67
Alexion Pharmaceuticals, Inc.
$64
Boehringer Ingelheim Pharmaceuticals, Inc.
$61
Exelixis Inc.
$54
Stemline Therapeutics Inc.
$54
Bayer Healthcare Pharmaceuticals Inc.
$50
ABBVIE INC.
$44
PUMA BIOTECHNOLOGY, INC.
$42
SERVIER PHARMACEUTICALS LLC
$39
EISAI INC.
$39
Incyte Corporation
$39
Tactile Systems Technology Inc
$38
Lilly USA, LLC
$36
SOBI, INC
$36
Acrotech Biopharma LLC
$36
AVEO Pharmaceuticals, Inc.
$35
Organon Llc
$31
G1 Therapeutics, Inc.
$23
Jazz Pharmaceuticals Inc.
$21
Mirati Therapeutics, Inc.
$21
Genmab U.S., Inc.
$21
Kite Pharma, Inc.
$21
JAZZ PHARMACEUTICALS INC.
$19
EMD Serono, Inc.
$18
NOVARTIS PHARMACEUTICALS CORPORATION
$18
RECORDATI_RARE_DISEASES_INC.
$17
MorphoSys, US Inc.
$17
Janssen Pharmaceuticals, Inc
$15
Karyopharm Therapeutics Inc.
$15
Adaptive Biotechnologies Corporation
$15
TAIHO ONCOLOGY, INC.
$15
Kyowa Kirin, Inc.
$15
Epizyme, Inc.,
$14
Gilead Sciences, Inc.
$12
Top 3 companies account for 48.1% of all-time payments
Associated products mentioned in payments ›
AUGTYRO · BAVENCIO · BELEODAQ · BLENREP · BRUKINSA · CABOMETYX · CALQUENCE · CARVYKTI · COSELA · CREON · DARZALEX · Doptelet · ELIQUIS · ENHERTU · ERLEADA · Enhertu · FOTIVDA · FRUZAQLA · Fabhalta · Flexitouch Plus · GILOTRIF · Halaven · IBRANCE · ICLUSIG · IDHIFA · IMBRUVICA · IMFINZI · INJECTAFER · JAKAFI · JEVTANA · KEYTRUDA · KISQALI · KRAZATI · Kyprolis · LIBTAYO · LONSURF · LUPRON DEPOT · LUTATHERA · LYNPARZA · Lenvima · MEKINIST · MONJUVI · NERLYNX · NINLARO · Nplate · Nubeqa · OJJAARA · ONTRUZANT · OPDIVO · OPDUALAG · Orserdu · PADCEV · PIQRAY · PLUVICTO · PROMACTA · Padcev · Perjeta · Pomalyst · Poteligeo · QINLOCK · REBLOZYL · RYBREVANT · Restrata Wound Matrix · Rezlidhia · SARCLISA · SCEMBLIX · SYLVANT · SYNAGIS · TABRECTA · TASIGNA · TAZVERIK · TECVAYLI · TUKYSA · Tivdak · ULTOMIRIS · VENCLEXTA · VERZENIO · Venclexta · Voranigo · XARELTO · XPOVIO · XTANDI · Xospata · Xtandi · ZEPZELCA · clonoSEQ
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
Allergy & immunologists in nearby ZIP areas
17
County median income
$70,578
Nearest hospital to ZIP centroid (approximate)
MEMORIAL MISSION HOSPITAL AND ASHEVILLE SURGERY CE
3.7 mi
3.7 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. Chay is a mixed practice specialist, with above-average Medicare volume (top 1% in NC), 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. Chay experienced with pembrolizumab injection (keytruda)?
Based on Medicare claims data, Dr. Chay performed 12,600 pembrolizumab injection (keytruda) 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. Chay receive payments from pharmaceutical companies?
Yes. Dr. Chay received a total of $7,396 from 54 companies across 195 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. Chay's costs compare to other allergy & immunologists in Asheville?
Dr. Chay's average Medicare payment per service is $22. 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. Chay) 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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Industry payments
Pharma Payments to Allergy & Immunologists in NC
Which NC allergy & immunologists receive the most from drug and device companies.
By company
Seagen Inc. Payments to Doctors
See all physicians who received payments from Seagen Inc.
By company
Rigel Pharmaceuticals, Inc. Payments to Doctors
See all physicians who received payments from Rigel Pharmaceuticals, Inc.
By company
Daiichi Sankyo Inc. Payments to Doctors
See all physicians who received payments from Daiichi Sankyo Inc.
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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