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Dr. Gregory S. Tierney, MD

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Specializes in: Sports Medicine and Orthopedics/Orthopedic Surgery

1401 25th Street S
Great Falls, MT 59405

(406) 731-8888

Dr. Gregory S. Tierney, MD is a sports medicine doctor in Great Falls, MT specializing in sports medicine and orthopedics/orthopedic surgery.

Office Locations

1401 25th Street S
Great Falls, MT 59405

open_in_new

In The News

“"We re very excited to be in Lewistown," said Dr. Gregory Tierney, Benefis President of Clinical Operations, during a brief speech before the ribbon cutting Wednesday morning.”—"Benefis' urgent care clinic opens in Lewistown", Lewistown News-Argus, October 2025

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT during 2012 were musculoskeletal imaging, X-rays, aspiration and injections.

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

aspiration	135
doctor visit	357
hip imaging	36
injections	135
joint surgery	60
lower extremity surgery	60
minimally invasive procedures	26
MRI (magnetic resonance imaging)	49
musculoskeletal imaging	244
reconstructive surgery	34
X-rays	195

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT during 2013 were musculoskeletal imaging, X-rays, aspiration and injections.

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

aspiration	132
doctor visit	350
hip imaging	29
injections	132
joint surgery	57
lower extremity surgery	57
minimally invasive procedures	28
MRI (magnetic resonance imaging)	42
musculoskeletal imaging	213
reconstructive surgery	29
X-rays	171

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Tierney, MD.

**Gender**
Male	112
Female	157

**Ethnicity**
Non-Hispanic White	245
Black	0
Hispanic	0
Asian	0
Other	0
Native American	13

**Age**
From 65 to 74	119
From 75 to 84	76
85 and over	29
Less than 65	45

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2013

Hypertension	58
High Cholesterol	51
Stroke	0
Ischemic Heart Disease	22
Depression	23
Chronic Kidney Disease	14
Asthma	6
Osteoperosis	11
Atrial Fibrilation	7
Heart Failure	10
Chronic Obstructive Pulmonary Disease	14
Diabetes	28
Dementia	6
Cancer	9

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT during 2014 were musculoskeletal imaging, X-rays, aspiration and injections.

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

aspiration	109
debridement (removal of unhealthy tissue)	11
doctor visit	411
hip imaging	11
injections	109
joint surgery	55
lower extremity surgery	44
minimally invasive procedures	34
MRI (magnetic resonance imaging)	11
musculoskeletal imaging	129
reconstructive surgery	21
upper extremity surgery	11
X-rays	118

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Tierney, MD.

**Gender**
Male	117
Female	158

**Ethnicity**
Non-Hispanic White	251
Black	0
Hispanic	0
Asian	0
Other	0
Native American	12

**Age**
From 65 to 74	123
From 75 to 84	74
85 and over	26
Less than 65	52

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2014

Hypertension	57
High Cholesterol	48
Stroke	0
Ischemic Heart Disease	27
Depression	30
Chronic Kidney Disease	13
Asthma	9
Osteoperosis	8
Atrial Fibrilation	10
Heart Failure	12
Chronic Obstructive Pulmonary Disease	13
Diabetes	27
Dementia	0
Cancer	10

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT during 2015 were X-rays, musculoskeletal imaging, aspiration and injections.

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

aspiration	84
debridement (removal of unhealthy tissue)	15
doctor visit	272
injections	84
joint surgery	45
lower extremity surgery	30
minimally invasive procedures	27
musculoskeletal imaging	89
open surgery	13
reconstructive surgery	18
upper extremity surgery	28
X-rays	89

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Tierney, MD.

**Gender**
Male	202
Female	280

**Ethnicity**
Non-Hispanic White	442
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	248
From 75 to 84	122
85 and over	56
Less than 65	56

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2015

Hypertension	61
High Cholesterol	41
Stroke	5
Ischemic Heart Disease	19
Depression	29
Chronic Kidney Disease	20
Asthma	15
Osteoperosis	11
Atrial Fibrilation	7
Heart Failure	12
Chronic Obstructive Pulmonary Disease	18
Diabetes	32
Dementia	5
Cancer	12

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT during 2016 were X-rays, musculoskeletal imaging, aspiration and injections.

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

aspiration	91
doctor visit	331
injections	91
joint surgery	17
lower extremity surgery	17
musculoskeletal imaging	98
open surgery	15
reconstructive surgery	17
upper extremity surgery	15
X-rays	98

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Tierney, MD.

**Gender**
Male	106
Female	132

**Ethnicity**
Non-Hispanic White	218
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	115
From 75 to 84	64
85 and over	19
Less than 65	40

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2016

Hypertension	62
High Cholesterol	47
Stroke	0
Ischemic Heart Disease	22
Depression	28
Chronic Kidney Disease	18
Asthma	21
Osteoperosis	8
Atrial Fibrilation	8
Heart Failure	12
Chronic Obstructive Pulmonary Disease	15
Diabetes	33
Dementia	5
Cancer	12

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT during 2017 were X-rays, musculoskeletal imaging, aspiration and injections.

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

aspiration	85
doctor visit	323
injections	85
joint surgery	51
lower extremity surgery	51
minimally invasive procedures	24
musculoskeletal imaging	105
reconstructive surgery	27
X-rays	105

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Tierney, MD.

**Gender**
Male	125
Female	140

**Ethnicity**
Non-Hispanic White	242
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	129
From 75 to 84	75
85 and over	25
Less than 65	36

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2017

Hypertension	66
High Cholesterol	50
Stroke	0
Ischemic Heart Disease	26
Depression	32
Chronic Kidney Disease	20
Asthma	14
Osteoperosis	11
Atrial Fibrilation	10
Heart Failure	14
Chronic Obstructive Pulmonary Disease	17
Diabetes	29
Dementia	5
Cancer	12

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT during 2018 were X-rays, musculoskeletal imaging, aspiration and injections.

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

aspiration	80
doctor visit	267
injections	80
joint surgery	26
lower extremity surgery	26
minimally invasive procedures	11
musculoskeletal imaging	93
reconstructive surgery	15
X-rays	93

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Tierney, MD.

**Gender**
Male	95
Female	99

**Ethnicity**
Non-Hispanic White	175
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	96
From 75 to 84	52
85 and over	14
Less than 65	32

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2018

Hypertension	58
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	26
Depression	28
Chronic Kidney Disease	16
Asthma	10
Osteoperosis	8
Atrial Fibrilation	6
Heart Failure	9
Chronic Obstructive Pulmonary Disease	15
Diabetes	26
Dementia	0
Cancer	13

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT during 2019 were X-rays, musculoskeletal imaging, aspiration and injections.

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

aspiration	64
doctor visit	166
injections	64
joint surgery	20
lower extremity surgery	20
musculoskeletal imaging	76
reconstructive surgery	20
X-rays	76

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Tierney, MD.

**Gender**
Male	72
Female	75

**Ethnicity**
Non-Hispanic White	128
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	71
From 75 to 84	42
85 and over	12
Less than 65	22

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2019

Hypertension	66
High Cholesterol	50
Stroke	0
Ischemic Heart Disease	36
Depression	29
Chronic Kidney Disease	20
Asthma	16
Osteoperosis	8
Atrial Fibrilation	9
Heart Failure	10
Chronic Obstructive Pulmonary Disease	16
Diabetes	31
Dementia	7
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT during 2020 were X-rays, musculoskeletal imaging, aspiration and injections.

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

aspiration	36
doctor visit	77
injections	36
musculoskeletal imaging	48
X-rays	48

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Tierney, MD.

**Gender**
Male	45
Female	51

**Age**
From 65 to 74	56
From 75 to 84	25
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2020

Hypertension	61
High Cholesterol	56
Stroke	0
Ischemic Heart Disease	29
Depression	25
Chronic Kidney Disease	21
Asthma	11
Osteoperosis	13
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	11
Diabetes	29
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT during 2021 were X-rays, musculoskeletal imaging, aspiration and injections.

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

aspiration	22
doctor visit	59
injections	22
musculoskeletal imaging	44
X-rays	44

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Tierney, MD.

**Gender**
Male	25
Female	42

**Age**
From 65 to 74	39
From 75 to 84	14
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2021

Hypertension	67
High Cholesterol	52
Stroke	0
Ischemic Heart Disease	27
Depression	36
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	31
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT during 2022 were aspiration, injections, X-rays and musculoskeletal imaging.

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

aspiration	33
doctor visit	38
injections	33
musculoskeletal imaging	23
X-rays	23

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Tierney, MD.

**Gender**
Male	29
Female	23

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

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2022

Hypertension	75
High Cholesterol	67
Stroke	0
Ischemic Heart Disease	23
Depression	23
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	25
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Gregory S. Tierney, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gregory S. Tierney, MD treated as a sports medicine doctor in Great Falls, MT were musculoskeletal imaging, X-rays, aspiration and injections.

aspiration	79
debridement (removal of unhealthy tissue)	13
doctor visit	241
hip imaging	25
injections	79
joint surgery	41
lower extremity surgery	38
minimally invasive procedures	25
MRI (magnetic resonance imaging)	34
musculoskeletal imaging	105
open surgery	14
reconstructive surgery	22
upper extremity surgery	18
X-rays	96

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Gregory S. Tierney, MD.

**Gender**
Male	84
Female	105

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	154
Native American / Alaskan Native	2
Hispanic	0
Other	0

**Age**
75 to 84	49
85 and over	16
Less than 65	25
65 to 74	93

Average of Total of Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Gregory S. Tierney, MD treated were hypertension, high cholesterol, diabetes and depression.

Hypertension	57
High Cholesterol	46
Stroke	0
Ischemic Heart Disease	23
Depression	25
Chronic Kidney Disease	12
Asthma	9
Osteoporosis	7
Heart Failure	7
Chronic Obstructive Pulmonary Disease	10
Diabetes	26
Atrial Fibrillation	5
Dementia	2
Cancer	7

Education & Training

He has a state license in Montana.

Licensed In: Montana

Ratings & Reviews

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General Payments

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

**Payments by Company**
DePuy Synthes Sales Inc.	$3,107 KNEES $2,307	Extremities $389	Orthopaedics $137	Trauma $126	Knee $60	Other $87
Stryker Corporation	$1,063 KNEES $951	HIPS $77	INTERVENTIONAL SPINE $35
Siemens Medical Solutions USA, Inc.	$98 Artis icono floor $98
Globus Medical, Inc.	$43 Excelsius - GPS $19	In-Line ALIF $12	Spine $12
Pfizer Inc.	$35 ELIQUIS $23	CELEBREX $13
Other	$90 Exogen $26	ZORVOLEX $20	Osteoarthritis of the knee $20	STRATAFIX $13	AVELLE $12

**Types of Payments**
Travel and Lodging	$3,215
Food and Beverage	$1,185
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$35

Ownership and Interest Payments

This table describes ownership payments received by Dr. Gregory S. Tierney, MD.

NovoSource, Inc.	2013	$17,000.00	Physician Covered Recipient	Preferred Series A 10 Percent 5-year dividend
NovoSource, Inc.	2014	$13,400.00	Physician Covered Recipient	Preferred Series A 10 Percent 5-year dividend

Biography

Dr. Gregory Tierney sees patients in Great Falls, MT. His medical specialties are orthopedics/orthopedic surgery and sports medicine. He graduated from the University of Washington School of Medicine.

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Dr. Gregory S. Tierney, 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. Gregory S. Tierney, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory S. Tierney, 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. Gregory S. Tierney, MD From 2012 - 2022

Education & Training

Ratings & Reviews

General Payments

Ownership and Interest Payments

Biography

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