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Dr. Matthias Weiss, MD

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Specializes in: Adult Oncology and Adult Hematology

1818 N Meade Street Suite W120
Appleton, WI 54911

(920) 735-7300

Dr. Matthias Weiss, MD is an oncologist in Appleton, WI specializing in adult oncology and adult hematology.

Office Locations

1818 N Meade Street Suite W120
Appleton, WI 54911

(920) 735-7300

(920) 735-7333

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700 West Avenue S
La Crosse, WI 54601

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In The News

“It is time that the relief of serious health-related suffering and the value of dying and death is respected and addressed appropriately," wrote Matthias Weiss, MD, PhD, of ThedaCare Cancer Care in...”—"Julia Frydman on Fixing Barriers to Palliative Cancer Care in Underserved Areas", MedPage Today, December 2025

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Matthias Weiss, MD treated as an oncologist in Appleton, WI during 2012 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and preventive care.

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

aspiration	12
biological response modifier (BRM) therapy	713
bone marrow tests	23
chemotherapy	713
diagnostic procedures	23
doctor visit	1439
hormone therapy	24
minimally invasive procedures	884
port flush	35
preventive care	78
vaccines	78

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Matthias Weiss, MD treated as an oncologist in Appleton, WI during 2013 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and preventive care.

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

biological response modifier (BRM) therapy	573
bone marrow tests	11
chemotherapy	573
diagnostic procedures	11
doctor visit	1223
hormone therapy	23
minimally invasive procedures	688
port flush	32
preventive care	76
vaccines	76

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Matthias Weiss, MD.

**Gender**
Male	208
Female	264

**Ethnicity**
Non-Hispanic White	448
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	208
From 75 to 84	164
85 and over	60
Less than 65	40

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2013

Hypertension	56
High Cholesterol	47
Stroke	3
Ischemic Heart Disease	31
Depression	14
Chronic Kidney Disease	30
Asthma	4
Osteoperosis	8
Atrial Fibrilation	10
Heart Failure	17
Chronic Obstructive Pulmonary Disease	21
Diabetes	22
Dementia	4
Cancer	47

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Matthias Weiss, MD treated as an oncologist in Appleton, WI during 2014 were lab tests, minimally invasive procedures, chemotherapy and biological response modifier (BRM) therapy.

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

biological response modifier (BRM) therapy	116
blood draw	51
chemotherapy	116
doctor visit	510
hospital care	89
inpatient care	89
lab tests	152
minimally invasive procedures	144

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Matthias Weiss, MD.

**Gender**
Male	158
Female	187

**Ethnicity**
Non-Hispanic White	324
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	164
From 75 to 84	118
85 and over	35
Less than 65	28

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2014

Hypertension	58
High Cholesterol	43
Stroke	3
Ischemic Heart Disease	27
Depression	16
Chronic Kidney Disease	36
Asthma	6
Osteoperosis	9
Atrial Fibrilation	12
Heart Failure	20
Chronic Obstructive Pulmonary Disease	18
Diabetes	23
Dementia	7
Cancer	46

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Matthias Weiss, MD treated as an oncologist in Appleton, WI during 2015 were hospital care and inpatient care.

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

doctor visit	196
hospital care	33
inpatient care	33

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Matthias Weiss, MD.

**Gender**
Male	84
Female	88

**Age**
From 65 to 74	86
From 75 to 84	56
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2015

Hypertension	66
High Cholesterol	51
Stroke	0
Ischemic Heart Disease	34
Depression	22
Chronic Kidney Disease	37
Asthma	15
Osteoperosis	0
Atrial Fibrilation	17
Heart Failure	26
Chronic Obstructive Pulmonary Disease	19
Diabetes	27
Dementia	0
Cancer	47

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Matthias Weiss, MD treated as an oncologist in Appleton, WI during 2016 were lab tests, hospital care, inpatient care and blood draw.

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

blood draw	42
doctor visit	282
hospital care	98
inpatient care	98
lab tests	420

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Matthias Weiss, MD.

**Gender**
Male	64
Female	53

**Age**
From 65 to 74	62
From 75 to 84	29
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2016

Hypertension	63
High Cholesterol	61
Stroke	0
Ischemic Heart Disease	32
Depression	20
Chronic Kidney Disease	40
Asthma	14
Osteoperosis	0
Atrial Fibrilation	23
Heart Failure	21
Chronic Obstructive Pulmonary Disease	13
Diabetes	36
Dementia	0
Cancer	39

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Matthias Weiss, MD treated as an oncologist in Appleton, WI during 2017 were lab tests and blood draw.

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

blood draw	109
doctor visit	252
lab tests	454

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Matthias Weiss, MD.

**Gender**
Male	53
Female	59

**Age**
From 65 to 74	52
From 75 to 84	34
85 and over	12
Less than 65	14

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2017

Hypertension	56
High Cholesterol	47
Stroke	0
Ischemic Heart Disease	33
Depression	20
Chronic Kidney Disease	34
Asthma	0
Osteoperosis	0
Atrial Fibrilation	10
Heart Failure	19
Chronic Obstructive Pulmonary Disease	20
Diabetes	29
Dementia	0
Cancer	40

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Matthias Weiss, MD treated as an oncologist in Appleton, WI during 2018 were lab tests and blood draw.

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

blood draw	50
doctor visit	489
lab tests	249

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Matthias Weiss, MD.

**Gender**
Male	79
Female	94

**Age**
From 65 to 74	79
From 75 to 84	57
85 and over	14
Less than 65	23

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2018

Hypertension	53
High Cholesterol	50
Stroke	0
Ischemic Heart Disease	27
Depression	23
Chronic Kidney Disease	33
Asthma	9
Osteoperosis	9
Atrial Fibrilation	8
Heart Failure	15
Chronic Obstructive Pulmonary Disease	13
Diabetes	28
Dementia	10
Cancer	46

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Matthias Weiss, MD treated as an oncologist in Appleton, WI during 2019 were hospital care and inpatient care.

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

doctor visit	509
hospital care	16
inpatient care	16

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Matthias Weiss, MD.

**Gender**
Male	84
Female	96

**Age**
From 65 to 74	83
From 75 to 84	53
85 and over	19
Less than 65	25

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2019

Hypertension	61
High Cholesterol	52
Stroke	0
Ischemic Heart Disease	31
Depression	18
Chronic Kidney Disease	36
Asthma	8
Osteoperosis	0
Atrial Fibrilation	14
Heart Failure	19
Chronic Obstructive Pulmonary Disease	14
Diabetes	22
Dementia	8
Cancer	47

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

doctor visit	344

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Matthias Weiss, MD.

**Gender**
Male	60
Female	67

**Age**
From 65 to 74	72
From 75 to 84	30
85 and over	13
Less than 65	12

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2020

Hypertension	57
High Cholesterol	49
Stroke	0
Ischemic Heart Disease	28
Depression	21
Chronic Kidney Disease	37
Asthma	9
Osteoperosis	9
Atrial Fibrilation	11
Heart Failure	18
Chronic Obstructive Pulmonary Disease	15
Diabetes	22
Dementia	0
Cancer	43

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

doctor visit	186

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Matthias Weiss, MD.

**Gender**
Male	64
Female	65

**Age**
From 65 to 74	66
From 75 to 84	43
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2021

Hypertension	63
High Cholesterol	52
Stroke	0
Ischemic Heart Disease	26
Depression	26
Chronic Kidney Disease	51
Asthma	0
Osteoperosis	9
Atrial Fibrilation	15
Heart Failure	22
Chronic Obstructive Pulmonary Disease	21
Diabetes	24
Dementia	0
Cancer	42

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

doctor visit	14

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2022

Hypertension	75
High Cholesterol	74
Stroke	0
Ischemic Heart Disease	0
Depression	0
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	52

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Matthias Weiss, MD for Medicare patients.

The highest averages for the top procedures that Dr. Matthias Weiss, MD treated as an oncologist in Appleton, WI were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and lab tests.

aspiration	12
biological response modifier (BRM) therapy	467
blood draw	63
bone marrow tests	17
chemotherapy	467
diagnostic procedures	17
doctor visit	494
hormone therapy	23
hospital care	59
inpatient care	59
lab tests	318
minimally invasive procedures	572
preventive care	77
vaccines	77

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Matthias Weiss, MD.

**Gender**
Male	77
Female	88

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	70
Native American / Alaskan Native	0
Hispanic	0
Other	0

**Age**
75 to 84	53
85 and over	13
Less than 65	12
65 to 74	79

Average of Total of Conditions of Medicare patients treated by Dr. Matthias Weiss, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Matthias Weiss, MD treated were hypertension, high cholesterol, cancer and chronic kidney disease.

Hypertension	55
High Cholesterol	47
Stroke	0
Ischemic Heart Disease	24
Depression	16
Chronic Kidney Disease	30
Asthma	5
Osteoporosis	4
Heart Failure	16
Chronic Obstructive Pulmonary Disease	14
Diabetes	21
Atrial Fibrillation	10
Dementia	2
Cancer	40

Education & Training

He has a state license in Wisconsin.

Licensed In: Wisconsin

Ratings & Reviews

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General Payments

These charts describe general payments received by Dr. Matthias Weiss, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
Lilly USA, LLC	$119 $119
E.R. Squibb & Sons, L.L.C.	$94 OPDIVO $94
Seattle Genetics, Inc.	$84 $84
ADC Therapeutics America, Inc.	$81 $81
Merck Sharp & Dohme Corporation	$69 KEYTRUDA $69

**Types of Payments**
Food and Beverage	$447

Research Payments

Dr. Matthias Weiss, MD has received 49 research payments totaling $157,765.

Biography

Dr. Matthias Weiss, who practices in Appleton, WI and La Crosse, WI, is a medical specialist in adult hematology and adult oncology. Dr. Weiss has obtained a license to practice in Wisconsin.

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Dr. Matthias Weiss, MD

Office Locations

In The News

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

2013 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

Conditions of Medicare patients treated by Dr. Matthias Weiss, MD in 2022

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Average Medicare Patient Data From 2012 - 2022

Average of Total of Conditions of Medicare patients treated by Dr. Matthias Weiss, MD From 2012 - 2022

Education & Training

Ratings & Reviews

General Payments

Research Payments

Biography

Other Providers in Appleton, WI