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Home > MO Providers

Dr. Mark Joseph Fesler, MD

Accepting New Patients

(16 Ratings)

Specializes in: Adult Oncology and Adult Hematology

St. Louis University School of Medicine

232 South Woods Mill Road Suite 330 East
Chesterfield, MO 63017

(314) 205-6737

Dr. Mark Joseph Fesler, MD is an oncologist in Chesterfield, MO specializing in adult oncology and adult hematology. He graduated from St. Louis University School of Medicine. Dr. Mark Joseph Fesler, MD is affiliated with VAN AMBURG AND BUSIEK MDS LLC.

Office Locations

232 South Woods Mill Road Suite 330 East
Chesterfield, MO 63017

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3655 Vista Avenue Street
Louis, MO 63110

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Noteworthy Medicare Patient Procedures Performed by Dr. Mark Joseph Fesler, MD in 2024

Click on any procedure below to see further details on volume and pricing among Medicare patients.

Top 5%

By Volume:

inpatient hospital care

In 2024, Dr. Mark Joseph Fesler, MD performed more inpatient hospital care (for patient admitted to hospital) procedures for Medicare patients than 95% of providers in related specialties within Missouri.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Mark Joseph Fesler, MD treated as an oncologist in Chesterfield, MO during 2012 were hospital care, inpatient care, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

aspiration	27
biological response modifier (BRM) therapy	206
blood draw	50
bone marrow tests	54
chemotherapy	206
diagnostic procedures	27
doctor visit	563
hospital care	663
inpatient care	663
minimally invasive procedures	244
port flush	48

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Mark Joseph Fesler, MD treated as an oncologist in Chesterfield, MO during 2013 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hospital care.

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

biological response modifier (BRM) therapy	118
blood draw	32
chemotherapy	118
doctor visit	381
hospital care	111
inpatient care	111
minimally invasive procedures	174
port flush	85

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	89
Female	91

**Ethnicity**
Non-Hispanic White	129
Black	38
Hispanic	0
Asian	0
Other	0
Native American	0

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

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2013

Hypertension	65
High Cholesterol	45
Stroke	6
Ischemic Heart Disease	47
Depression	31
Chronic Kidney Disease	44
Asthma	9
Osteoperosis	11
Atrial Fibrilation	13
Heart Failure	25
Chronic Obstructive Pulmonary Disease	26
Diabetes	33
Dementia	9
Cancer	12

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Mark Joseph Fesler, MD treated as an oncologist in Chesterfield, MO during 2014 were hospital care, inpatient care, chemotherapy and biological response modifier (BRM) therapy.

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

biological response modifier (BRM) therapy	43
blood draw	19
bone marrow tests	15
chemotherapy	43
diagnostic procedures	15
doctor visit	432
hospital care	59
inpatient care	59
minimally invasive procedures	43
port flush	20

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	76
Female	82

**Ethnicity**
Non-Hispanic White	119
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

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

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2014

Hypertension	61
High Cholesterol	47
Stroke	0
Ischemic Heart Disease	41
Depression	34
Chronic Kidney Disease	38
Asthma	9
Osteoperosis	9
Atrial Fibrilation	0
Heart Failure	22
Chronic Obstructive Pulmonary Disease	16
Diabetes	28
Dementia	8
Cancer	12

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

doctor visit	187

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	110
Female	110

**Ethnicity**
Non-Hispanic White	182
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	100
From 75 to 84	0
85 and over	0
Less than 65	56

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2015

Hypertension	62
High Cholesterol	45
Stroke	0
Ischemic Heart Disease	42
Depression	30
Chronic Kidney Disease	44
Asthma	10
Osteoperosis	10
Atrial Fibrilation	0
Heart Failure	18
Chronic Obstructive Pulmonary Disease	12
Diabetes	35
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Mark Joseph Fesler, MD treated as an oncologist in Chesterfield, MO during 2016 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

doctor visit	323
hospital care	45
inpatient care	45

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	63
Female	57

**Ethnicity**
Non-Hispanic White	102
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	55
From 75 to 84	0
85 and over	0
Less than 65	32

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2016

Hypertension	69
High Cholesterol	43
Stroke	0
Ischemic Heart Disease	34
Depression	33
Chronic Kidney Disease	43
Asthma	23
Osteoperosis	11
Atrial Fibrilation	13
Heart Failure	21
Chronic Obstructive Pulmonary Disease	22
Diabetes	30
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

doctor visit	269

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	53
Female	38

**Ethnicity**
Non-Hispanic White	75
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	43
From 75 to 84	0
85 and over	0
Less than 65	26

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2017

Hypertension	69
High Cholesterol	47
Stroke	0
Ischemic Heart Disease	41
Depression	35
Chronic Kidney Disease	56
Asthma	15
Osteoperosis	13
Atrial Fibrilation	12
Heart Failure	37
Chronic Obstructive Pulmonary Disease	27
Diabetes	24
Dementia	19
Cancer	0

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

doctor visit	283

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	64
Female	46

**Ethnicity**
Non-Hispanic White	92
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	53
From 75 to 84	0
85 and over	0
Less than 65	32

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2018

Hypertension	62
High Cholesterol	55
Stroke	0
Ischemic Heart Disease	38
Depression	33
Chronic Kidney Disease	54
Asthma	0
Osteoperosis	0
Atrial Fibrilation	10
Heart Failure	36
Chronic Obstructive Pulmonary Disease	23
Diabetes	34
Dementia	13
Cancer	0

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Mark Joseph Fesler, MD treated as an oncologist in Chesterfield, MO during 2019 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

doctor visit	202
hospital care	122
inpatient care	122

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	72
Female	53

**Ethnicity**
Non-Hispanic White	98
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	66
From 75 to 84	0
85 and over	0
Less than 65	32

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2019

Hypertension	66
High Cholesterol	53
Stroke	11
Ischemic Heart Disease	32
Depression	32
Chronic Kidney Disease	50
Asthma	0
Osteoperosis	10
Atrial Fibrilation	12
Heart Failure	34
Chronic Obstructive Pulmonary Disease	20
Diabetes	34
Dementia	17
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Mark Joseph Fesler, MD treated as an oncologist in Chesterfield, MO during 2020 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

doctor visit	169
hospital care	197
inpatient care	197

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	64
Female	53

**Ethnicity**
Non-Hispanic White	97
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	60
From 75 to 84	27
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2020

Hypertension	67
High Cholesterol	45
Stroke	0
Ischemic Heart Disease	36
Depression	27
Chronic Kidney Disease	55
Asthma	0
Osteoperosis	0
Atrial Fibrilation	15
Heart Failure	38
Chronic Obstructive Pulmonary Disease	21
Diabetes	36
Dementia	10
Cancer	15

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Mark Joseph Fesler, MD treated as an oncologist in Chesterfield, MO during 2021 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

doctor visit	194
hospital care	136
inpatient care	136

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	58
Female	50

**Ethnicity**
Non-Hispanic White	91
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	62
From 75 to 84	22
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2021

Hypertension	61
High Cholesterol	50
Stroke	0
Ischemic Heart Disease	27
Depression	29
Chronic Kidney Disease	48
Asthma	0
Osteoperosis	0
Atrial Fibrilation	16
Heart Failure	37
Chronic Obstructive Pulmonary Disease	19
Diabetes	25
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mark Joseph Fesler, MD treated as an oncologist in Chesterfield, MO during 2022 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

doctor visit	687
hospital care	232
inpatient care	232

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	117
Female	89

**Ethnicity**
Non-Hispanic White	188
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	76
From 75 to 84	93
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	9
Ischemic Heart Disease	36
Depression	23
Chronic Kidney Disease	31
Asthma	10
Osteoperosis	12
Atrial Fibrilation	26
Heart Failure	27
Chronic Obstructive Pulmonary Disease	20
Diabetes	32
Dementia	9
Cancer	23

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Mark Joseph Fesler, MD treated as an oncologist in Chesterfield, MO during 2023 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

doctor visit	761
hospital care	389
inpatient care	389

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	118
Female	105

**Ethnicity**
Non-Hispanic White	200
Black	11
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	82
From 75 to 84	101
85 and over	29
Less than 65	11

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	12
Ischemic Heart Disease	39
Depression	25
Chronic Kidney Disease	42
Asthma	13
Osteoperosis	12
Atrial Fibrilation	32
Heart Failure	32
Chronic Obstructive Pulmonary Disease	27
Diabetes	29
Dementia	9
Cancer	26

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Mark Joseph Fesler, MD treated as an oncologist in Chesterfield, MO during 2024 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

doctor visit	907
hospital care	545
inpatient care	545

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	144
Female	114

**Ethnicity**
Non-Hispanic White	238
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	100
From 75 to 84	105
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD in 2024

Hypertension	75
High Cholesterol	75
Stroke	11
Ischemic Heart Disease	41
Depression	25
Chronic Kidney Disease	43
Asthma	11
Osteoperosis	12
Atrial Fibrilation	31
Heart Failure	31
Chronic Obstructive Pulmonary Disease	25
Diabetes	25
Dementia	9
Cancer	28

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Mark Joseph Fesler, MD for Medicare patients.

The highest averages for the top procedures that Dr. Mark Joseph Fesler, MD treated as an oncologist in Chesterfield, MO were hospital care, inpatient care, minimally invasive procedures and chemotherapy.

aspiration	27
biological response modifier (BRM) therapy	122
blood draw	33
bone marrow tests	34
chemotherapy	122
diagnostic procedures	21
doctor visit	412
hospital care	249
inpatient care	249
minimally invasive procedures	153

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Mark Joseph Fesler, MD.

**Gender**
Male	79
Female	68

**Ethnicity**
Black / African American	3
Asian / Pacific Islander	0
Non-Hispanic White	123
Hispanic	0
Native American / Alaskan Native	0
Other	0

**Age**
75 to 84	26
85 and over	2
Less than 65	23
65 to 74	64

Average of Total of Conditions of Medicare patients treated by Dr. Mark Joseph Fesler, MD From 2012 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. Mark Joseph Fesler, MD treated were hypertension, high cholesterol, chronic kidney disease and ischemic heart disease.

Hypertension	62
High Cholesterol	50
Stroke	3
Ischemic Heart Disease	34
Depression	27
Chronic Kidney Disease	42
Asthma	7
Osteoporosis	7
Heart Failure	27
Chronic Obstructive Pulmonary Disease	19
Diabetes	28
Atrial Fibrillation	13
Dementia	7
Cancer	9

Education & Training

Dr. Mark Joseph Fesler, MD graduated from St. Louis University School of Medicine. He completed residency at University of Colorado Denver Affiliated Hospitals. He is certified by the American Board of Internal Medicine: Hematology and has a state license in Missouri.

Medical School: St. Louis University School of Medicine

Residency: University of Colorado Denver Affiliated Hospitals

Board Certification: American Board of Internal Medicine: Hematology

Licensed In: Missouri

Ratings & Reviews

Dr. Mark Joseph Fesler, MD has an exceptional overall rating with an average of 5.0 out of 5 stars based on 16 ratings. We collect ratings and reviews of Dr. Mark Joseph Fesler, MD from all over the web to help you find the right in Chesterfield, MO.

Overall Rating

(16 Ratings)

Leave a Review

Reviews From Around The Web

Overall Rating: 5.0 2025-09-02

Patient verified via Press Ganey

Dr. Fesler is amazing. I've been fortunate to have good doctors but Dr. Fesler stands out on top. He is warm and approachable. I feel he truly cares about all facets of my care. He always gives me quality time answering all my questions and even trying to find solutions to areas that are not specifically oncology to see to my total health care. I think he is a brilliant physician and it's a feather in St. Luke's cap to have him . I have total confidence in him and only wish he could be cloned so anyone with cancer could benefit from his care.

Overall Rating: 5.0 2026-08-24

Patient verified via Press Ganey

Dr Fessler was awesome. He actually took time to talk to me about a plan for treatment. He talked about new medications that might be better for me at this stage. He wasn't in a hurry to get me out the door. So refreshing! It made my day. Finally!

Overall Rating: 5.0 2025-06-23

Patient verified via Press Ganey

Dr. Fesler has provided excellent care and has made a scary diagnosis less frightening. He answers all of my questions & explains all of my test results in a manner that gives me hope, and gives me confidence in my treatment plan.

Overall Rating: 5.0 2026-06-11

Patient verified via Press Ganey

I started with Dr Fesler at ***** and enjoyed him and felt confident in his approach to my cancer that I followed him to St Luke's. And here his team is just as kind as his previous staff

Overall Rating: 5.0 2025-03-10

Patient verified via Press Ganey

Dr Fesler demonstrated a great amount of empathy and professionalism in answering my questions and discussing my options for treatment. I would highly recommend him.

Overall Rating: 5.0 2025-06-30

Patient verified via Press Ganey

Excellent first appointment. Dr. Fesler was thorough, very well-informed, and showed genuine concern for my case. We were blessed by the visit and interaction

Overall Rating: 5.0 2025-06-09

Patient verified via Press Ganey

Dr Fesler is friendly and always involves me in decisions. He answers questions and genuinely seems to care. Could not imagine anyone any better.

Overall Rating: 5.0 2026-06-10

Patient verified via Press Ganey

I have lived on this earth 68 years. There has been no Dr I fully trust more than Dr Fesler. Capable./competent-Compassionate and caring

Overall Rating: 5.0 2026-08-13

Patient verified via Press Ganey

I worry he spends too much time with me! He seems to appreciate my questions (and jokes) same with Amer and Sienna.

Overall Rating: 5.0 2026-03-02

Patient verified via Press Ganey

Dr. Fesler always takes time with us to discuss any concerns or questions

To see all 16 reviews for Dr. Mark Joseph Fesler, MD, view their full profile.

General Payments

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

**Payments by Company**
Incyte Corporation	$202,397 MONJUVI $107,890	JAKAFI $94,332	$175
GENZYME CORPORATION	$158,219 SARCLISA $55,948	MOZOBIL $44,877	$57,393
AbbVie Inc.	$155,548 Venclexta $81,796	Epkinly $43,970	EPKINLY $5,307	IMBRUVICA $20	$24,453
ADC Therapeutics America, Inc.	$68,949 ZYNLONTA $28,673	$40,276
Lilly USA, LLC	$44,214 JAYPIRCA $24,621	$19,593
Other	$275,303 BRUKINSA $53,476	Epkinly $41,608	Columvi $23,665	MOZOBIL $20,072	CALQUENCE $13,459	Other $123,024

**Types of Payments**
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$650,746
Consulting Fee	$145,746
Travel and Lodging	$62,808
Honoraria	$30,620
Food and Beverage	$14,473
Other	$237

Research Payments

Dr. Mark Joseph Fesler, MD has received 116 research payments totaling $1,113,519.

Biography

Mark Fesler, MD, is board certified in hematology, oncology and internal medicine and practices at St. Luke's Center for Cancer Care. Dr Fesler earned his medical degree at St. Louis University School of Medicine. He completed his residency at University of Colorado Health Sciences Center where he also served as Chief Resident. Dr Fesler completed his fellowship in hematology and medical oncology at St. Louis University School of Medicine. Dr Fesler specializes in all blood cancer and he has a special interest in the recent transformative developments in both diagnosis and treatment of blood cancer.