Physician

Christopher T Grennan, MD

According to 2025 Medicare claims, Christopher Grennan, MD (NPI: 1952620270) practices family practice in the Manhattan, KS market, with the plurality of this provider's patient population coming from Pottawatomie, KS. This provider's primary affiliated billing organization is COTTON-O'NEIL CLINIC REVOCABLE TRUST (NPI: 1811944457; TIN: 486341644) and primary practice location at 66547-9690. Grennan is affiliated with the Cotton-O'Neil ACO llc (ACO ID: A2506) and Vytalize Health KS 25 LLC (ACO ID: A5671), participating under the MSSP model.

Grennan's data goes back to 2015 and runs through 2024. For example, in 2024, this provider had 321 traditional Medicare patients, billed 3,833 HCPCS/CPT codes, and received $147,356 in Medicare payments. The top billing code was G0439 (Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit). Part D data shows 5,174 prescription claims across 341 beneficiaries totaling $306,228 in drug costs, led by Ozempic (Semaglutide). DME data shows 294 claims. No Open Payments records. 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 risen steadily, from $89,321 to $147,356. Concurrently, Part D prescription costs did not follow a clear longitudinal pattern. In contrast, DME billing represents a smaller volume and moved up and down with repeated peaks and valleys, starting at $8,004 and ending at $11,458.

Part B Carrier Billing Trend

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

Year	Patients	Clm Lines	Payment
2015	256	2,716	$89,321
2016	312	4,707	$96,737
2017	319	8,646	$122,249
2018	295	3,689	$99,451
2019	303	4,499	$112,581
2020	290	5,554	$131,446
2021	331	5,055	$159,268
2022	320	4,476	$160,199
2023	309	4,119	$165,861
2024	321	3,833	$147,356

Part D Events Trend

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

Year	Patients	Claims	Drug Cost
2015	216	5,052	$395,589
2016	218	4,818	$332,830
2017	252	4,739	$275,970
2018	243	4,818	$265,639
2019	259	4,609	$245,832
2020	261	4,360	$225,328
2021	304	4,540	$255,615
2022	316	4,943	$304,239
2023	321	4,801	$324,118
2024	341	5,174	$306,228

DME Billing Trend

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

Year	Patients	Claims	Payment
2015	23	141	$3,044
2016	19	124	$2,175
2017	32	118	$1,165
2018	52	247	$6,068
2019	51	211	$3,984
2020	33	127	$3,151
2021	65	240	$8,368
2022	95	282	$11,096
2023	107	384	$14,725
2024	51	294	$9,311

* / # = 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
G0439	Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	226	226	$120
99214	Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	278	511	$80
99213	Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more	185	365	$56
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	91	138	$11
36415	Insertion of needle into vein for collection of blood sample	290	850	$9

Top 5 Part D drugs in 2024

By total drug costs.

Drug	Generic	Claims	Total Day Supply	Total Drug Cost
Ozempic	Semaglutide	34	952	$38,115
Januvia	Sitagliptin Phosphate	34	2,040	$36,936
Xarelto	Rivaroxaban	27	1,290	$23,307
Rybelsus	Semaglutide	17	750	$21,308
Trulicity	Dulaglutide	15	644	$21,286

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	38	$2,780
E0601	Continuous positive airway pressure (cpap) device	Y	N/R	43	$1,428
A7031	Face mask interface, replacement for full face mask, each	N	N/R	15	$1,080
A7030	Full face mask used with positive airway pressure device, each	N	N/R	12	$822
A7034	Nasal interface (mask or cannula type) used with positive airway pressure device, with or without head strap	N	N/R	17	$818

Open Payments Summary

No connected Open Payments records were found for this physician in General Payments, Research Payments, or Ownership / Investment Interests.

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FAQ

What Medicare data is available for Christopher T. Grennan, MD?

Tedicare shows public-source Medicare data for Christopher T. Grennan, MD (NPI 1952620270), 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 T. Grennan, MD have ACO affiliation data?

Christopher T. Grennan, MD is shown with ACO affiliation data for Cotton-O'Neil ACO llc (MSSP, ACO ID A2506) and Vytalize Health KS 25 LLC (MSSP, ACO ID A5671).

What billing organization is linked to Christopher T. Grennan, MD?

Christopher T. Grennan, MD is linked to COTTON-O'NEIL CLINIC REVOCABLE TRUST (billing NPI 1811944457) in the available physician profile data.

Does Christopher T. Grennan, MD have Open Payments data?

No connected Open Payments records are shown for this physician in the available General Payments, Research Payments, or Ownership / Investment Interests 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.