Physician

Christopher Haekang Chay, M.D.

According to 2025 Medicare claims, Christopher Chay, M.D. (NPI: 1699764878) practices hematology/oncology in the Asheville, NC market, with the plurality of this provider's patient population coming from Buncombe, NC. This provider's primary affiliated billing organization is AMERICAN ONCOLOGY PARTNERS PA (NPI: 1265929723; TIN: 824681345) and primary practice location at 28806-2316. Chay is affiliated with the Mission Health Partners, LLC (ACO ID: A2591), participating under the MSSP model.

Chay's data goes back to 2015 and runs through 2024. For example, in 2024, this provider had 1,082 traditional Medicare patients, billed 130,308 HCPCS/CPT codes, and received $3,194,998 in Medicare payments. The top billing code was 99214 (Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more). Part D data shows 2,308 prescription claims across 351 beneficiaries totaling $6,352,871 in drug costs, led by Xtandi (Enzalutamide). DME data shows 65 claims. Open Payments data shows 133 records totaling $305,346. You can download detailed data with all billing codes (2015-2024). For more recent data, please contact us.

Over the past 10 years, this provider's Medicare Part B carrier billing has moved sharply higher in recent years, from $387,131 to $3,194,998. Similarly, Part D prescription costs have moved from a lower plateau to a higher plateau, from $1,703,604 to $6,352,871. In contrast, DME billing represents a smaller volume and moved up and down with repeated peaks and valleys, starting at $8,132 and ending at $2,807.

Part B Carrier Billing Trend

Medicare payment trend, with N of patients and claim lines in the table.

Year	Patients	Clm Lines	Payment
2015	842	20,274	$387,131
2016	819	16,053	$348,687
2017	754	13,091	$332,044
2018	646	18,078	$328,932
2019	544	16,795	$306,400
2020	837	116,259	$2,248,038
2021	824	99,341	$1,767,955
2022	937	100,462	$1,871,823
2023	1,182	154,213	$3,084,683
2024	1,082	130,308	$3,194,998

Part D Events Trend

Drug cost trend, with N of patients and prescription claims in the table.

Year	Patients	Claims	Drug Cost
2015	284	1,383	$1,703,604
2016	263	1,387	$1,612,779
2017	264	1,337	$1,675,960
2018	253	1,462	$3,138,116
2019	267	1,209	$2,236,462
2020	280	1,545	$2,990,432
2021	253	1,367	$2,769,046
2022	256	1,365	$3,111,234
2023	336	1,870	$4,904,842
2024	351	2,308	$6,352,871

DME Billing Trend

Medicare payment trend, with N of patients and DME claim records in the table.

Year	Patients	Claims	Payment
2015	N/R	203	$26,968
2016	N/R	130	$14,396
2017	N/R	94	$19,810
2018	N/R	44	$3,943
2019	N/R	N/R	N/R
2020	N/R	48	$5,781
2021	N/R	51	$3,945
2022	11	43	$2,572
2023	28	154	$18,185
2024	N/R	65	$3,699

* / # = suppressed by CMS; 0 = reported zero; N/R = not reported or blank.

Top 5 Part B carrier billing codes in 2024

By total payments.

Code	Description	Patients	Clm Lines	Total Payment
99214	Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	315	503	$89
99213	Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more	261	383	$61
G2211	Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's	382	674	$12
36415	Insertion of needle into vein for collection of blood sample	688	1,365	$9
85025	Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	757	1,576	$8

Top 5 Part D drugs in 2024

By total drug costs.

Drug	Generic	Claims	Total Day Supply	Total Drug Cost
Xtandi	Enzalutamide	95	2,850	$1,244,734
Revlimid	Lenalidomide	58	1,603	$1,164,550
Ibrance	Palbociclib	60	1,680	$882,170
Abiraterone Acetate	Abiraterone Acetate	226	6,960	$530,765
Nubeqa	Darolutamide	24	720	$308,366

Top 5 DME services in 2024

By Total Medicare Payment Amount.

HCPCS Code	HCPCS Description	Supplier Rental Indicator	Total Supplier Beneficiaries	Total Supplier Claims	Total Medicare Payment Amount
E1390	Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate	Y	N/R	11	$1,368
J8700	Temozolomide, oral, 5 mg	N	N/R	12	$1,001
E0656	Segmental pneumatic appliance for use with pneumatic compressor, trunk	Y	N/R	12	$510
E1392	Portable oxygen concentrator, rental	Y	N/R	12	$481
Q0511	Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for the first prescription in a 30-day period	N	N/R	18	$339

Open Payments Summary in 2024

Category	Definition	Records	Total Reported Amount	Top Related Entity
General Payments	Reported payment or transfer-of-value amount.	63	$2,153	Daiichi Sankyo Inc.
Research Payments	Reported research-related payment or transfer-of-value amount.	70	$303,192	Eli Lilly and Company
Ownership / Investment Interests	Reported value of ownership or investment interests.	0	$0	N/R

Explore More Providers

FAQ

What Medicare data is available for Christopher Haekang Chay, M.D.?

Tedicare shows public-source Medicare data for Christopher Haekang Chay, M.D. (NPI 1699764878), including provider identity, specialty, market context, Medicare Part B activity, Part D prescribing, DME records, Open Payments where available, billing organization details, and ACO affiliation signals where available. Profile data covers 2015-2024, with current attribution based on 2025 claims where available.

Does Christopher Haekang Chay, M.D. have ACO affiliation data?

Christopher Haekang Chay, M.D. is shown with ACO affiliation data for Mission Health Partners, LLC (MSSP, ACO ID A2591).

What billing organization is linked to Christopher Haekang Chay, M.D.?

Christopher Haekang Chay, M.D. is linked to AMERICAN ONCOLOGY PARTNERS PA (billing NPI 1265929723) in the available physician profile data.

Does Christopher Haekang Chay, M.D. have Open Payments data?

Christopher Haekang Chay, M.D. has 133 connected Open Payments records in the available 2024 summary data.

Can I download physician-level Medicare data from Tedicare?

Yes. Tedicare provides sample physician export data and paid custom physician data exports for research, planning, outreach, and market analysis. Exports can include physician profile fields, market and specialty context, billing organization details, ACO affiliation signals where available, and Medicare utilization data.