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Dr. Mark Anthony Sitarik, MD

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Specializes in: Medical Oncology, Adult Oncology, Adult Hematology and Hospital Medicine (Hospitalist)

MCP Hahnemann School of Medicine (1982)

Professional interests include: hospital care

1024 S. Lemay Avenue
Fort Collins, CO 80526

(303) 385-2000

Dr. Mark Anthony Sitarik, MD is a medical oncologist in Fort Collins, CO specializing in medical oncology, adult oncology, adult hematology and hospital medicine (hospitalist). He graduated from MCP Hahnemann School of Medicine in 1982 and has 44 years of experience. Dr. Mark Anthony Sitarik, MD is affiliated with UCHealth, CommonSpirit Health - Mountain Region and ROCKY MOUNTAIN CANCER CENTERS LLP.

Office Locations

1024 S. Lemay Avenue
Fort Collins, CO 80526

open_in_new

CommonSpirit Health - Mountain Region

4715 Arapahoe Avenue
Boulder, CO 80303

(303) 385-2000

(303) 267-4419

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In The News

“The family wishes to express their deep gratitude to Dr. Mark Sitarik and the wonderful people at the Rocky Mountain Cancer Center as well as the transfusion nurses at Boulder Community Health.”—"Peter Sprenkle", Boulder Daily Camera, July 2021

“The family wishes to thank Dr. Mark Sitarik, Dr. Andrew Antell, and the incredible staff with Rocky Mountain Cancer Care; our team Jeani, DeeDee, Maddy, and Sheila with Tru Community Hospice;...”—"Bob Wiederrich", Boulder Daily Camera, December 2020

Noteworthy Medicare Patient Procedures Performed by Dr. Mark Anthony Sitarik, MD in 2023

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

Top 5%

By Volume:

therapeutic phlebotomy

By Affordability:

antineoplastic hormone therapy

hormone therapy

therapeutic phlebotomy

In 2023, among providers in related specialties within Colorado, Dr. Mark Anthony Sitarik, MD performed more therapeutic phlebotomy procedures for Medicare patients than 95% of them and he also had a list price for antineoplastic hormone therapy, hormone therapy, and therapeutic phlebotomy that was lower than the list prices billed to Medicare by 95% of them. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Top 10%

By Affordability:

port flush

In 2023, Dr. Mark Anthony Sitarik, MD had a list price for port flush that was lower than the list prices billed to Medicare by 90% of providers in related specialties within Colorado. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Top 25%

By Volume:

biological response modifier therapy

intravenous chemotherapy

minimally invasive procedures

In 2012, Dr. Mark Anthony Sitarik, MD performed more biological response modifier (BRM) therapy, intravenous (IV) chemotherapy, and minimally invasive procedures procedures for Medicare patients than 75% of providers in related specialties within Colorado.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO during 2012 were hospital care, inpatient care, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

biological response modifier (BRM) therapy	106
chemotherapy	106
doctor visit	1055
hormone therapy	23
hospital care	163
inpatient care	163
minimally invasive procedures	161

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO during 2013 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hospital care.

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

biological response modifier (BRM) therapy	156
chemotherapy	156
doctor visit	981
hormone therapy	30
hospital care	146
inpatient care	146
minimally invasive procedures	193
port flush	14

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Anthony Sitarik, MD.

**Gender**
Male	189
Female	258

**Ethnicity**
Non-Hispanic White	416
Black	0
Hispanic	18
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	236
From 75 to 84	132
85 and over	42
Less than 65	37

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2013

Hypertension	44
High Cholesterol	37
Stroke	3
Ischemic Heart Disease	30
Depression	17
Chronic Kidney Disease	24
Asthma	5
Osteoperosis	9
Atrial Fibrilation	12
Heart Failure	17
Chronic Obstructive Pulmonary Disease	16
Diabetes	15
Dementia	6
Cancer	46

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO during 2014 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hospital care.

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

biological response modifier (BRM) therapy	178
chemotherapy	178
doctor visit	985
hormone therapy	33
hospital care	155
inpatient care	155
minimally invasive procedures	237
port flush	20

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Anthony Sitarik, MD.

**Gender**
Male	191
Female	263

**Ethnicity**
Non-Hispanic White	415
Black	0
Hispanic	15
Asian	0
Other	12
Native American	0

**Age**
From 65 to 74	256
From 75 to 84	122
85 and over	42
Less than 65	34

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2014

Hypertension	46
High Cholesterol	31
Stroke	3
Ischemic Heart Disease	26
Depression	14
Chronic Kidney Disease	26
Asthma	3
Osteoperosis	7
Atrial Fibrilation	12
Heart Failure	15
Chronic Obstructive Pulmonary Disease	14
Diabetes	18
Dementia	7
Cancer	48

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO during 2015 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hospital care.

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

biological response modifier (BRM) therapy	220
blood draw	16
chemotherapy	220
doctor visit	1078
hormone therapy	22
hospital care	202
inpatient care	202
minimally invasive procedures	277
port flush	22

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Anthony Sitarik, MD.

**Gender**
Male	470
Female	620

**Ethnicity**
Non-Hispanic White	998
Black	0
Hispanic	36
Asian	0
Other	30
Native American	0

**Age**
From 65 to 74	594
From 75 to 84	306
85 and over	100
Less than 65	90

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2015

Hypertension	47
High Cholesterol	34
Stroke	6
Ischemic Heart Disease	28
Depression	17
Chronic Kidney Disease	28
Asthma	7
Osteoperosis	8
Atrial Fibrilation	13
Heart Failure	18
Chronic Obstructive Pulmonary Disease	13
Diabetes	17
Dementia	7
Cancer	43

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO during 2016 were minimally invasive procedures, hospital care, inpatient care and chemotherapy.

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

biological response modifier (BRM) therapy	170
chemotherapy	170
doctor visit	1079
hospital care	201
inpatient care	201
minimally invasive procedures	256
port flush	31

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Anthony Sitarik, MD.

**Gender**
Male	229
Female	325

**Ethnicity**
Non-Hispanic White	502
Black	0
Hispanic	24
Asian	0
Other	13
Native American	0

**Age**
From 65 to 74	290
From 75 to 84	164
85 and over	52
Less than 65	48

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2016

Hypertension	48
High Cholesterol	33
Stroke	4
Ischemic Heart Disease	33
Depression	16
Chronic Kidney Disease	30
Asthma	16
Osteoperosis	8
Atrial Fibrilation	13
Heart Failure	17
Chronic Obstructive Pulmonary Disease	14
Diabetes	18
Dementia	8
Cancer	44

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO during 2017 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hospital care.

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

biological response modifier (BRM) therapy	230
blood draw	16
chemotherapy	230
doctor visit	1323
hormone therapy	23
hospital care	210
inpatient care	210
minimally invasive procedures	324
port flush	29

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Anthony Sitarik, MD.

**Gender**
Male	242
Female	338

**Ethnicity**
Non-Hispanic White	523
Black	0
Hispanic	22
Asian	0
Other	20
Native American	0

**Age**
From 65 to 74	300
From 75 to 84	182
85 and over	60
Less than 65	38

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2017

Hypertension	44
High Cholesterol	32
Stroke	4
Ischemic Heart Disease	28
Depression	18
Chronic Kidney Disease	29
Asthma	6
Osteoperosis	10
Atrial Fibrilation	13
Heart Failure	13
Chronic Obstructive Pulmonary Disease	15
Diabetes	17
Dementia	7
Cancer	42

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO during 2018 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hospital care.

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

biological response modifier (BRM) therapy	240
blood draw	19
chemotherapy	240
doctor visit	1241
hormone therapy	25
hospital care	115
inpatient care	115
minimally invasive procedures	311
port flush	21

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Anthony Sitarik, MD.

**Gender**
Male	242
Female	341

**Ethnicity**
Non-Hispanic White	533
Black	0
Hispanic	22
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	289
From 75 to 84	184
85 and over	59
Less than 65	51

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2018

Hypertension	47
High Cholesterol	32
Stroke	4
Ischemic Heart Disease	29
Depression	21
Chronic Kidney Disease	34
Asthma	7
Osteoperosis	10
Atrial Fibrilation	15
Heart Failure	17
Chronic Obstructive Pulmonary Disease	14
Diabetes	18
Dementia	8
Cancer	46

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO during 2019 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hospital care.

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

biological response modifier (BRM) therapy	242
blood draw	27
chemotherapy	242
doctor visit	1213
hormone therapy	34
hospital care	113
inpatient care	113
minimally invasive procedures	365
port flush	24

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Anthony Sitarik, MD.

**Gender**
Male	248
Female	364

**Ethnicity**
Non-Hispanic White	548
Black	0
Hispanic	27
Asian	0
Other	23
Native American	0

**Age**
From 65 to 74	318
From 75 to 84	196
85 and over	55
Less than 65	43

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2019

Hypertension	47
High Cholesterol	36
Stroke	3
Ischemic Heart Disease	34
Depression	23
Chronic Kidney Disease	26
Asthma	6
Osteoperosis	13
Atrial Fibrilation	13
Heart Failure	17
Chronic Obstructive Pulmonary Disease	12
Diabetes	16
Dementia	8
Cancer	43

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO during 2020 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hospital care.

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

biological response modifier (BRM) therapy	290
blood draw	19
chemotherapy	290
doctor visit	887
hormone therapy	39
hospital care	82
inpatient care	82
minimally invasive procedures	402
port flush	62

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Anthony Sitarik, MD.

**Gender**
Male	264
Female	309

**Ethnicity**
Non-Hispanic White	510
Black	0
Hispanic	24
Asian	0
Other	24
Native American	0

**Age**
From 65 to 74	301
From 75 to 84	186
85 and over	49
Less than 65	37

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2020

Hypertension	46
High Cholesterol	36
Stroke	3
Ischemic Heart Disease	33
Depression	21
Chronic Kidney Disease	28
Asthma	8
Osteoperosis	13
Atrial Fibrilation	13
Heart Failure	17
Chronic Obstructive Pulmonary Disease	13
Diabetes	17
Dementia	9
Cancer	43

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO during 2021 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hormone therapy.

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

biological response modifier (BRM) therapy	356
blood draw	16
chemotherapy	356
doctor visit	1082
hormone therapy	61
hospital care	41
inpatient care	41
minimally invasive procedures	544
port flush	30

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Anthony Sitarik, MD.

**Gender**
Male	298
Female	375

**Ethnicity**
Non-Hispanic White	594
Black	0
Hispanic	32
Asian	0
Other	33
Native American	0

**Age**
From 65 to 74	326
From 75 to 84	253
85 and over	54
Less than 65	40

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2021

Hypertension	48
High Cholesterol	41
Stroke	4
Ischemic Heart Disease	36
Depression	22
Chronic Kidney Disease	29
Asthma	8
Osteoperosis	15
Atrial Fibrilation	16
Heart Failure	16
Chronic Obstructive Pulmonary Disease	12
Diabetes	16
Dementia	7
Cancer	43

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO during 2022 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hormone therapy.

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

biological response modifier (BRM) therapy	169
blood draw	29
chemotherapy	169
doctor visit	941
hormone therapy	48
hospital care	25
inpatient care	25
minimally invasive procedures	284
port flush	18

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Anthony Sitarik, MD.

**Gender**
Male	248
Female	325

**Ethnicity**
Non-Hispanic White	501
Black	0
Hispanic	24
Asian	0
Other	26
Native American	0

**Age**
From 65 to 74	273
From 75 to 84	215
85 and over	56
Less than 65	29

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2022

Hypertension	55
High Cholesterol	54
Stroke	7
Ischemic Heart Disease	30
Depression	21
Chronic Kidney Disease	19
Asthma	12
Osteoperosis	23
Atrial Fibrilation	18
Heart Failure	16
Chronic Obstructive Pulmonary Disease	17
Diabetes	15
Dementia	5
Cancer	46

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Mark Anthony Sitarik, MD for Medicare patients.

The highest averages for the top procedures that Dr. Mark Anthony Sitarik, MD treated as a medical oncologist in Fort Collins, CO were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hospital care.

biological response modifier (BRM) therapy	214
blood draw	20
chemotherapy	214
doctor visit	1078
hormone therapy	33
hospital care	132
inpatient care	132
minimally invasive procedures	304

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Mark Anthony Sitarik, MD.

**Gender**
Male	238
Female	319

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	503
Hispanic	22
Native American / Alaskan Native	0
Other	17

**Age**
75 to 84	176
85 and over	51
Less than 65	40
65 to 74	289

Average of Total of Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Mark Anthony Sitarik, MD treated were hypertension, cancer, high cholesterol and ischemic heart disease.

Hypertension	42
High Cholesterol	33
Stroke	3
Ischemic Heart Disease	27
Depression	17
Chronic Kidney Disease	24
Asthma	7
Osteoporosis	10
Heart Failure	14
Chronic Obstructive Pulmonary Disease	12
Diabetes	15
Atrial Fibrillation	12
Cancer	40
Dementia	6

Education & Training

Dr. Mark Anthony Sitarik, MD graduated from MCP Hahnemann School of Medicine in 1982. He completed residency at University Hospitals, Cleveland. He is certified by the American Board of Internal Medicine (American Board of Internal Medicine) Medical Oncology and has a state license in Colorado.

Medical School: MCP Hahnemann School of Medicine (1982)

Residency: University Hospitals, Cleveland

Board Certification: American Board of Internal Medicine (American Board of Internal Medicine) Medical Oncology

Licensed In: Colorado

Affiliations & Hospitals

Dr. Mark Anthony Sitarik, MD is associated with these hospitals and organizations:

UCHealth

CommonSpirit Health - Mountain Region

ROCKY MOUNTAIN CANCER CENTERS LLP

Ratings & Reviews

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General Payments

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

**Payments by Company**
Amgen Inc.	$61 Aranesp $61
Genentech USA, Inc.	$45 Gazyva $45
Pfizer Inc.	$34 ELIQUIS $19	IBRANCE $15
Merck Sharp & Dohme Corporation	$15 KEYTRUDA $15
Gilead Sciences, Inc.	$12 $12
Other	$9 Creon $9

**Types of Payments**
Education	$99
Food and Beverage	$76

Biography

Dr. Mark Sitarik is a physician who specializes in hospital medicine (hospitalist), adult hematology, and adult oncology. Areas of particular interest for Dr. Sitarik include hospital care. Before performing his residency at the University Hospitals, Cleveland, Dr. Sitarik attended MCP Hahnemann School of Medicine. He is professionally affiliated with CommonSpirit Health - Mountain Region and UCHealth.

Select Year:

Dr. Mark Anthony Sitarik, MD

Office Locations

In The News

Noteworthy Medicare Patient Procedures Performed by Dr. Mark Anthony Sitarik, MD in 2023

By Volume:

By Affordability:

By Affordability:

By Volume:

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. Mark Anthony Sitarik, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Mark Anthony Sitarik, 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. Mark Anthony Sitarik, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography

Other Providers in Fort Collins, CO