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Dr. William Colin Gallahan, MD

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Specializes in: Internal Medicine (Adult Medicine) and Gastroenterology (Digestive System)

University of Virginia School of Medicine (2004)

169 Wadsworth Drive
North Chesterfield, VA 23236

(804) 330-4021

Dr. William Colin Gallahan, MD is an internist in North Chesterfield, VA specializing in internal medicine (adult medicine) and gastroenterology (digestive system). He graduated from University of Virginia School of Medicine in 2004 and has 22 years of experience. Dr. William Colin Gallahan, MD is affiliated with Bon Secours, Bon Secours St. Mary's Hospital (Greenville, SC), St. Francis Medical Center (Midlothian, VA), Memorial Regional Medical Center (Mechanicsville, VA), HCA Virginia and Johnston - Willis Hospital Chippenham Hospital.

Office Locations

169 Wadsworth Drive
North Chesterfield, VA 23236

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Noteworthy Medicare Patient Procedures Performed by Dr. William Colin Gallahan, MD in 2023

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

Top 5%

By Volume:

colonoscopy

colonoscopy with biopsy

colonoscopy with lesion removal

endoscopy

gastrointestinal biopsy

gastrointestinal procedures

removal of lesion

In 2023, Dr. William Colin Gallahan, MD performed more colonoscopy, colonoscopy with biopsy, colonoscopy with lesion removal, endoscopy, gastrointestinal biopsy, gastrointestinal procedures, and removal of lesion (e.g. growth) procedures for Medicare patients than 95% of providers in related specialties within Virginia.

Top 10%

By Volume:

EGD with biopsy

EGD with lesion removal

inpatient hospital care

In 2023, Dr. William Colin Gallahan, MD performed more EGD with biopsy, EGD with lesion removal, and inpatient hospital care (for patient admitted to hospital) procedures for Medicare patients than 90% of providers in related specialties within Virginia.

Top 25%

By Affordability:

complete abdominal ultrasound

In 2012, Dr. William Colin Gallahan, MD had a list price for complete abdominal ultrasound that was lower than the list prices billed to Medicare by 75% of providers in related specialties within Virginia. 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.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA during 2012 were inpatient care, hospital care, gastrointestinal procedures and minimally invasive procedures.

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

aspiration	14
balloon dilation	15
diagnostic procedures	226
doctor visit	272
esophageal dilation	15
gastrointestinal procedures	346
hospital care	701
image guided procedures	14
inpatient care	701
minimally invasive procedures	346
minor procedures	14
preventive care	29
removal of lesion (e.g. growth)	226
ultrasound (sonogram)	43

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA during 2013 were inpatient care, hospital care, gastrointestinal procedures and minimally invasive procedures.

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

anastomosis	14
aspiration	27
balloon dilation	19
catheterization	14
diagnostic procedures	403
doctor visit	408
esophageal dilation	19
gastrointestinal procedures	589
hospital care	724
image guided procedures	27
injections	11
inpatient care	724
minimally invasive procedures	589
minor procedures	27
preventive care	58
removal of lesion (e.g. growth)	403
ultrasound (sonogram)	49

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. William Colin Gallahan, MD.

**Gender**
Male	346
Female	452

**Ethnicity**
Non-Hispanic White	649
Black	128
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	388
From 75 to 84	214
85 and over	103
Less than 65	93

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2013

Hypertension	75
High Cholesterol	61
Stroke	10
Ischemic Heart Disease	38
Depression	24
Chronic Kidney Disease	32
Asthma	6
Osteoperosis	6
Atrial Fibrilation	15
Heart Failure	18
Chronic Obstructive Pulmonary Disease	18
Diabetes	33
Dementia	13
Cancer	16

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA during 2014 were inpatient care, hospital care, gastrointestinal procedures and minimally invasive procedures.

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

anastomosis	11
aspiration	17
balloon dilation	15
catheterization	11
diagnostic procedures	407
doctor visit	389
esophageal dilation	15
gastrointestinal procedures	574
hospital care	732
image guided procedures	17
inpatient care	732
minimally invasive procedures	574
minor procedures	17
preventive care	76
removal of lesion (e.g. growth)	407
ultrasound (sonogram)	30

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. William Colin Gallahan, MD.

**Gender**
Male	355
Female	437

**Ethnicity**
Non-Hispanic White	628
Black	139
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	410
From 75 to 84	212
85 and over	91
Less than 65	79

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2014

Hypertension	75
High Cholesterol	62
Stroke	7
Ischemic Heart Disease	38
Depression	24
Chronic Kidney Disease	33
Asthma	11
Osteoperosis	7
Atrial Fibrilation	16
Heart Failure	21
Chronic Obstructive Pulmonary Disease	19
Diabetes	37
Dementia	13
Cancer	18

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA during 2015 were inpatient care, hospital care, gastrointestinal procedures and minimally invasive procedures.

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

aspiration	26
balloon dilation	17
diagnostic procedures	433
doctor visit	465
esophageal dilation	17
gastrointestinal procedures	526
hospital care	787
image guided procedures	26
injections	12
inpatient care	787
minimally invasive procedures	526
minor procedures	26
preventive care	30
removal of lesion (e.g. growth)	433
ultrasound (sonogram)	26

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. William Colin Gallahan, MD.

**Gender**
Male	728
Female	900

**Ethnicity**
Non-Hispanic White	1298
Black	254
Hispanic	0
Asian	0
Other	32
Native American	0

**Age**
From 65 to 74	764
From 75 to 84	522
85 and over	180
Less than 65	162

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2015

Hypertension	75
High Cholesterol	64
Stroke	7
Ischemic Heart Disease	41
Depression	25
Chronic Kidney Disease	34
Asthma	14
Osteoperosis	9
Atrial Fibrilation	15
Heart Failure	19
Chronic Obstructive Pulmonary Disease	19
Diabetes	35
Dementia	12
Cancer	17

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA during 2016 were inpatient care, hospital care, gastrointestinal procedures and minimally invasive procedures.

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

aspiration	19
balloon dilation	15
diagnostic procedures	430
doctor visit	527
esophageal dilation	15
gastrointestinal procedures	520
hospital care	691
image guided procedures	19
inpatient care	691
minimally invasive procedures	520
minor procedures	19
preventive care	26
removal of lesion (e.g. growth)	430
ultrasound (sonogram)	34

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. William Colin Gallahan, MD.

**Gender**
Male	370
Female	454

**Ethnicity**
Non-Hispanic White	678
Black	121
Hispanic	12
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	434
From 75 to 84	225
85 and over	92
Less than 65	73

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2016

Hypertension	75
High Cholesterol	66
Stroke	8
Ischemic Heart Disease	40
Depression	23
Chronic Kidney Disease	38
Asthma	22
Osteoperosis	6
Atrial Fibrilation	16
Heart Failure	18
Chronic Obstructive Pulmonary Disease	18
Diabetes	36
Dementia	14
Cancer	14

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA during 2017 were inpatient care, hospital care, gastrointestinal procedures and minimally invasive procedures.

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

aspiration	13
balloon dilation	24
diagnostic procedures	414
doctor visit	537
esophageal dilation	24
gastrointestinal procedures	529
hospital care	686
image guided procedures	13
inpatient care	686
minimally invasive procedures	529
minor procedures	13
preventive care	30
removal of lesion (e.g. growth)	414
ultrasound (sonogram)	34

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. William Colin Gallahan, MD.

**Gender**
Male	388
Female	502

**Ethnicity**
Non-Hispanic White	703
Black	156
Hispanic	0
Asian	13
Other	0
Native American	0

**Age**
From 65 to 74	439
From 75 to 84	274
85 and over	96
Less than 65	81

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2017

Hypertension	75
High Cholesterol	59
Stroke	8
Ischemic Heart Disease	39
Depression	26
Chronic Kidney Disease	38
Asthma	11
Osteoperosis	7
Atrial Fibrilation	16
Heart Failure	18
Chronic Obstructive Pulmonary Disease	16
Diabetes	39
Dementia	15
Cancer	16

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA during 2018 were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

abdominal imaging	20
balloon dilation	23
diagnostic procedures	459
doctor visit	592
esophageal dilation	23
gastrointestinal procedures	570
hospital care	872
inpatient care	872
minimally invasive procedures	570
preventive care	27
removal of lesion (e.g. growth)	459
ultrasound (sonogram)	42

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. William Colin Gallahan, MD.

**Gender**
Male	433
Female	501

**Ethnicity**
Non-Hispanic White	735
Black	149
Hispanic	0
Asian	0
Other	21
Native American	0

**Age**
From 65 to 74	475
From 75 to 84	265
85 and over	102
Less than 65	92

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2018

Hypertension	75
High Cholesterol	69
Stroke	7
Ischemic Heart Disease	39
Depression	26
Chronic Kidney Disease	38
Asthma	8
Osteoperosis	8
Atrial Fibrilation	16
Heart Failure	21
Chronic Obstructive Pulmonary Disease	16
Diabetes	36
Dementia	15
Cancer	16

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA during 2019 were inpatient care, hospital care, gastrointestinal procedures and minimally invasive procedures.

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

abdominal imaging	21
aspiration	15
balloon dilation	25
diagnostic procedures	468
doctor visit	684
esophageal dilation	25
gastrointestinal procedures	599
hospital care	630
image guided procedures	15
inpatient care	630
minimally invasive procedures	599
minor procedures	15
preventive care	36
removal of lesion (e.g. growth)	468
ultrasound (sonogram)	60

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. William Colin Gallahan, MD.

**Gender**
Male	481
Female	595

**Ethnicity**
Non-Hispanic White	858
Black	173
Hispanic	0
Asian	0
Other	23
Native American	0

**Age**
From 65 to 74	523
From 75 to 84	344
85 and over	118
Less than 65	91

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2019

Hypertension	75
High Cholesterol	72
Stroke	8
Ischemic Heart Disease	39
Depression	29
Chronic Kidney Disease	43
Asthma	11
Osteoperosis	8
Atrial Fibrilation	16
Heart Failure	23
Chronic Obstructive Pulmonary Disease	19
Diabetes	37
Dementia	16
Cancer	15

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA during 2020 were gastrointestinal procedures, minimally invasive procedures, inpatient care and hospital care.

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

aspiration	16
balloon dilation	33
diagnostic procedures	392
doctor visit	350
esophageal dilation	33
gastrointestinal procedures	491
hospital care	437
image guided procedures	16
inpatient care	437
minimally invasive procedures	491
minor procedures	16
preventive care	14
removal of lesion (e.g. growth)	392
ultrasound (sonogram)	33

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. William Colin Gallahan, MD.

**Gender**
Male	301
Female	421

**Ethnicity**
Non-Hispanic White	571
Black	125
Hispanic	0
Asian	0
Other	15
Native American	0

**Age**
From 65 to 74	378
From 75 to 84	209
85 and over	82
Less than 65	53

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2020

Hypertension	75
High Cholesterol	73
Stroke	9
Ischemic Heart Disease	34
Depression	28
Chronic Kidney Disease	41
Asthma	10
Osteoperosis	10
Atrial Fibrilation	14
Heart Failure	19
Chronic Obstructive Pulmonary Disease	15
Diabetes	35
Dementia	15
Cancer	16

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA during 2021 were gastrointestinal procedures, minimally invasive procedures, inpatient care and hospital care.

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

aspiration	25
balloon dilation	25
diagnostic procedures	462
doctor visit	365
esophageal dilation	25
gastrointestinal procedures	551
hospital care	526
image guided procedures	25
inpatient care	526
minimally invasive procedures	551
minor procedures	25
preventive care	15
removal of lesion (e.g. growth)	462
ultrasound (sonogram)	49

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. William Colin Gallahan, MD.

**Gender**
Male	344
Female	455

**Ethnicity**
Non-Hispanic White	634
Black	115
Hispanic	0
Asian	0
Other	27
Native American	0

**Age**
From 65 to 74	392
From 75 to 84	295
85 and over	66
Less than 65	46

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2021

Hypertension	75
High Cholesterol	74
Stroke	8
Ischemic Heart Disease	38
Depression	23
Chronic Kidney Disease	38
Asthma	8
Osteoperosis	6
Atrial Fibrilation	16
Heart Failure	21
Chronic Obstructive Pulmonary Disease	15
Diabetes	37
Dementia	11
Cancer	17

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA during 2022 were gastrointestinal procedures, minimally invasive procedures, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

abdominal imaging	19
aspiration	17
balloon dilation	28
diagnostic procedures	551
doctor visit	372
esophageal dilation	28
gastrointestinal procedures	641
hospital care	368
image guided procedures	17
inpatient care	368
minimally invasive procedures	641
minor procedures	17
preventive care	21
removal of lesion (e.g. growth)	551
ultrasound (sonogram)	52

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. William Colin Gallahan, MD.

**Gender**
Male	369
Female	470

**Ethnicity**
Non-Hispanic White	668
Black	125
Hispanic	0
Asian	11
Other	24
Native American	0

**Age**
From 65 to 74	417
From 75 to 84	311
85 and over	69
Less than 65	42

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	10
Ischemic Heart Disease	27
Depression	20
Chronic Kidney Disease	24
Asthma	11
Osteoperosis	13
Atrial Fibrilation	22
Heart Failure	18
Chronic Obstructive Pulmonary Disease	15
Diabetes	36
Dementia	7
Cancer	20

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. William Colin Gallahan, MD for Medicare patients.

The highest averages for the top procedures that Dr. William Colin Gallahan, MD treated as an internist in North Chesterfield, VA were inpatient care, hospital care, gastrointestinal procedures and minimally invasive procedures.

abdominal imaging	20
anastomosis	12
aspiration	18
balloon dilation	21
catheterization	12
diagnostic procedures	422
doctor visit	451
esophageal dilation	21
gastrointestinal procedures	539
hospital care	650
image guided procedures	18
injections	11
inpatient care	650
minimally invasive procedures	539
minor procedures	18
preventive care	32
removal of lesion (e.g. growth)	422
ultrasound (sonogram)	41

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. William Colin Gallahan, MD.

**Gender**
Male	374
Female	471

**Ethnicity**
Black / African American	135
Asian / Pacific Islander	2
Non-Hispanic White	674
Native American / Alaskan Native	0
Hispanic	1
Other	12

**Age**
75 to 84	261
85 and over	90
Less than 65	73
65 to 74	420

Average of Total of Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. William Colin Gallahan, MD treated were hypertension, high cholesterol, ischemic heart disease and diabetes.

Hypertension	68
High Cholesterol	61
Stroke	7
Ischemic Heart Disease	33
Depression	22
Chronic Kidney Disease	32
Asthma	10
Osteoporosis	7
Heart Failure	17
Chronic Obstructive Pulmonary Disease	15
Diabetes	32
Atrial Fibrillation	14
Dementia	11
Cancer	15

Education & Training

Dr. William Colin Gallahan, MD graduated from University of Virginia School of Medicine in 2004. He completed residency at Duke University Hospital. He is certified by the American Board of Internal Medicine (Gastroenterology) and has a state license in North Carolina.

Medical School: University of Virginia School of Medicine (2004)

Residency: Duke University Hospital (2007)

Board Certification: American Board of Internal Medicine (Gastroenterology)

Licensed In: North Carolina

Affiliations & Hospitals

Dr. William Colin Gallahan, MD is associated with these hospitals and organizations:

Bon Secours

Bon Secours St. Mary's Hospital (Greenville, SC)

St. Francis Medical Center (Midlothian, VA)

Memorial Regional Medical Center (Mechanicsville, VA)

HCA Virginia

Johnston - Willis Hospital Chippenham Hospital

Ratings & Reviews

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General Payments

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

**Payments by Company**
AbbVie Inc.	$2,194 Rinvoq $603	Skyrizi $471	Humira $445	Creon $389	LINZESS $231	Other $55
AbbVie, Inc.	$966 Humira $790	Creon $153	$23
Takeda Pharmaceuticals U.S.A., Inc.	$658 ENTYVIO $569	MOTEGRITY $89
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$624 XIFAXAN $498	Trulance $83	Uceris $42
Takeda Pharmaceuticals America, Inc.	$478 ENTYVIO $241	AMITIZA $190	Dexilant $47
Other	$3,585 SIMPONI $223	IBSRELA $214	GATTEX $205	ZEPOSIA $198	XIFAXAN $194	Other $2,551

**Types of Payments**
Food and Beverage	$8,505

Biography

Dr. William Gallahan's medical specialty is gastroenterology (digestive system). Dr. Gallahan obtained his medical school training at the University of Virginia School of Medicine and performed his residency at Duke University Hospital. His hospital/clinic affiliations include St. Francis Medical Center (Midlothian, VA), Bon Secours St. Mary's Hospital (Greenville, SC), and HCA Virginia. According to Bon Secours, he is currently accepting new patients at his office in North Chesterfield, VA.

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Dr. William Colin Gallahan, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. William Colin Gallahan, MD in 2023

By Volume:

By Volume:

By Affordability:

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. William Colin Gallahan, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Colin Gallahan, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Colin Gallahan, 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. William Colin Gallahan, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography