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Dr. William Frederick Ergen, MD

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Specializes in: Adult Gastroenterology

Professional interests include: inflammatory bowel disease, colon cancer

1901 Clinch Avenue
Knoxville, TN 37916

(865) 331-1111

Dr. William Frederick Ergen, MD is a gastroenterologist in Knoxville, TN specializing in adult gastroenterology. Dr. William Frederick Ergen, MD is affiliated with Covenant Health and Fort Sanders Regional Medical Center.

Office Locations

1311 Dowell Springs Boulevard
Knoxville, TN 37909

(865) 588-5121

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1901 Clinch Avenue
Knoxville, TN 37916

(865) 331-1111

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629 Delozier Way Suite 100 Powell Tn
Powell, TN 37849

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Noteworthy Medicare Patient Procedures Performed by Dr. William Frederick Ergen, MD in 2024

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

Top 10%

By Affordability:

flexible sigmoidoscopy with biopsy

In 2024, Dr. William Frederick Ergen, MD had a list price for flexible sigmoidoscopy with biopsy that was lower than the list prices billed to Medicare by 90% of providers in related specialties within Tennessee. 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

colonoscopy with biopsy

colonoscopy with lesion removal

diagnostic endoscopy

gastrointestinal biopsy

intravenous infusion therapy

intravenous chemotherapy

minimally invasive procedures

removal of lesion

By Affordability:

diagnostic flexible sigmoidoscopy

diagnostic sigmoidoscopy

esophageal dilation

flexible sigmoidoscopy

sigmoidoscopy

In 2012, among providers in related specialties within Tennessee, Dr. William Frederick Ergen, MD performed more biological response modifier (BRM) therapy, colonoscopy with biopsy, colonoscopy with lesion removal, diagnostic endoscopy, gastrointestinal biopsy, intravenous infusion therapy, intravenous (IV) chemotherapy, minimally invasive procedures, and removal of lesion (e.g. growth) procedures for Medicare patients than 75% of them and he also had a list price for diagnostic flexible sigmoidoscopy, diagnostic sigmoidoscopy, esophageal dilation, flexible sigmoidoscopy, and sigmoidoscopy that was lower than the list prices billed to Medicare by 75% 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.

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. William Frederick Ergen, MD treated as a gastroenterologist in Knoxville, TN during 2018 were removal of lesion (e.g. growth), minimally invasive procedures, diagnostic procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. William Frederick Ergen, MD for Medicare patients.

diagnostic procedures	53
gastrointestinal procedures	53
hospital care	40
inpatient care	40
minimally invasive procedures	53
removal of lesion (e.g. growth)	53

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. William Frederick Ergen, MD.

**Gender**
Male	63
Female	48

**Age**
From 65 to 74	49
From 75 to 84	35
85 and over	11
Less than 65	16

Conditions of Medicare patients treated by Dr. William Frederick Ergen, MD in 2018

Hypertension	75
High Cholesterol	62
Stroke	0
Ischemic Heart Disease	42
Depression	29
Chronic Kidney Disease	42
Asthma	0
Osteoperosis	0
Atrial Fibrilation	23
Heart Failure	26
Chronic Obstructive Pulmonary Disease	23
Diabetes	34
Dementia	13
Cancer	14

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. William Frederick Ergen, MD treated as a gastroenterologist in Knoxville, TN during 2019 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. William Frederick Ergen, MD for Medicare patients.

diagnostic procedures	271
doctor visit	191
esophageal dilation	14
gastrointestinal procedures	321
hospital care	89
inpatient care	89
minimally invasive procedures	321
preventive care	36
removal of lesion (e.g. growth)	271

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. William Frederick Ergen, MD.

**Gender**
Male	173
Female	188

**Ethnicity**
Non-Hispanic White	337
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	191
From 75 to 84	102
85 and over	23
Less than 65	45

Conditions of Medicare patients treated by Dr. William Frederick Ergen, MD in 2019

Hypertension	72
High Cholesterol	65
Stroke	8
Ischemic Heart Disease	40
Depression	33
Chronic Kidney Disease	40
Asthma	8
Osteoperosis	7
Atrial Fibrilation	0
Heart Failure	24
Chronic Obstructive Pulmonary Disease	22
Diabetes	35
Dementia	10
Cancer	13

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. William Frederick Ergen, MD treated as a gastroenterologist in Knoxville, TN during 2020 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. William Frederick Ergen, MD for Medicare patients.

diagnostic procedures	220
doctor visit	253
esophageal dilation	14
gastrointestinal procedures	251
hospital care	45
inpatient care	45
minimally invasive procedures	251
preventive care	17
removal of lesion (e.g. growth)	220

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. William Frederick Ergen, MD.

**Gender**
Male	133
Female	178

**Ethnicity**
Non-Hispanic White	291
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	179
From 75 to 84	82
85 and over	22
Less than 65	28

Conditions of Medicare patients treated by Dr. William Frederick Ergen, MD in 2020

Hypertension	70
High Cholesterol	60
Stroke	5
Ischemic Heart Disease	37
Depression	30
Chronic Kidney Disease	41
Asthma	9
Osteoperosis	8
Atrial Fibrilation	14
Heart Failure	23
Chronic Obstructive Pulmonary Disease	19
Diabetes	35
Dementia	10
Cancer	13

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. William Frederick Ergen, MD treated as a gastroenterologist in Knoxville, TN during 2021 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. William Frederick Ergen, MD for Medicare patients.

biological response modifier (BRM) therapy	50
chemotherapy	50
chronic care	149
diagnostic procedures	242
doctor visit	316
esophageal dilation	23
gastrointestinal procedures	277
minimally invasive procedures	327
preventive care	20
removal of lesion (e.g. growth)	242

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. William Frederick Ergen, MD.

**Gender**
Male	163
Female	211

**Ethnicity**
Non-Hispanic White	349
Black	0
Hispanic	0
Asian	0
Other	12
Native American	0

**Age**
From 65 to 74	207
From 75 to 84	118
85 and over	18
Less than 65	31

Conditions of Medicare patients treated by Dr. William Frederick Ergen, MD in 2021

Hypertension	67
High Cholesterol	63
Stroke	4
Ischemic Heart Disease	28
Depression	29
Chronic Kidney Disease	37
Asthma	7
Osteoperosis	9
Atrial Fibrilation	8
Heart Failure	11
Chronic Obstructive Pulmonary Disease	15
Diabetes	30
Dementia	10
Cancer	12

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. William Frederick Ergen, MD treated as a gastroenterologist in Knoxville, TN during 2022 were minimally invasive procedures, gastrointestinal procedures, chronic care and diagnostic procedures.

Volume of procedures performed by Dr. William Frederick Ergen, MD for Medicare patients.

biological response modifier (BRM) therapy	71
chemotherapy	71
chronic care	306
diagnostic procedures	286
doctor visit	309
esophageal dilation	29
gastrointestinal procedures	311
minimally invasive procedures	382
preventive care	13
removal of lesion (e.g. growth)	274

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. William Frederick Ergen, MD.

**Gender**
Male	177
Female	213

**Ethnicity**
Non-Hispanic White	375
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	230
From 75 to 84	117
85 and over	17
Less than 65	26

Conditions of Medicare patients treated by Dr. William Frederick Ergen, MD in 2022

Hypertension	72
High Cholesterol	75
Stroke	4
Ischemic Heart Disease	22
Depression	23
Chronic Kidney Disease	24
Asthma	11
Osteoperosis	13
Atrial Fibrilation	13
Heart Failure	8
Chronic Obstructive Pulmonary Disease	16
Diabetes	27
Dementia	0
Cancer	15

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. William Frederick Ergen, MD treated as a gastroenterologist in Knoxville, TN during 2023 were minimally invasive procedures, gastrointestinal procedures, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. William Frederick Ergen, MD for Medicare patients.

biological response modifier (BRM) therapy	73
chemotherapy	73
chronic care	19
diagnostic procedures	342
doctor visit	315
esophageal dilation	37
gastrointestinal procedures	383
minimally invasive procedures	456
preventive care	27
removal of lesion (e.g. growth)	331

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. William Frederick Ergen, MD.

**Gender**
Male	215
Female	241

**Ethnicity**
Non-Hispanic White	427
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	269
From 75 to 84	149
85 and over	17
Less than 65	21

Conditions of Medicare patients treated by Dr. William Frederick Ergen, MD in 2023

Hypertension	71
High Cholesterol	75
Stroke	4
Ischemic Heart Disease	23
Depression	24
Chronic Kidney Disease	17
Asthma	11
Osteoperosis	14
Atrial Fibrilation	14
Heart Failure	7
Chronic Obstructive Pulmonary Disease	12
Diabetes	26
Dementia	2
Cancer	17

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. William Frederick Ergen, MD treated as a gastroenterologist in Knoxville, TN during 2024 were minimally invasive procedures, gastrointestinal procedures, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. William Frederick Ergen, MD for Medicare patients.

biological response modifier (BRM) therapy	95
chemotherapy	95
diagnostic procedures	362
doctor visit	222
esophageal dilation	20
gastrointestinal procedures	397
minimally invasive procedures	503
preventive care	35
removal of lesion (e.g. growth)	350

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. William Frederick Ergen, MD.

**Gender**
Male	185
Female	245

**Ethnicity**
Non-Hispanic White	397
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	265
From 75 to 84	144
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Frederick Ergen, MD in 2024

Hypertension	65
High Cholesterol	75
Stroke	4
Ischemic Heart Disease	23
Depression	19
Chronic Kidney Disease	18
Asthma	11
Osteoperosis	11
Atrial Fibrilation	14
Heart Failure	7
Chronic Obstructive Pulmonary Disease	12
Diabetes	27
Dementia	4
Cancer	16

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2018 - 2024

Volume of procedures performed by Dr. William Frederick Ergen, MD for Medicare patients.

The highest averages for the top procedures that Dr. William Frederick Ergen, MD treated as a gastroenterologist in Knoxville, TN were minimally invasive procedures, gastrointestinal procedures, diagnostic procedures and removal of lesion (e.g. growth).

biological response modifier (BRM) therapy	72
chemotherapy	72
chronic care	158
diagnostic procedures	253
doctor visit	267
esophageal dilation	22
gastrointestinal procedures	284
hospital care	58
inpatient care	58
minimally invasive procedures	327
preventive care	24
removal of lesion (e.g. growth)	248

Average Medicare Patient Data From 2018 - 2024

Information about Medicare patients treated by Dr. William Frederick Ergen, MD.

**Gender**
Female	189
Male	158

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	310
Native American / Alaskan Native	0
Hispanic	0
Other	1

**Age**
75 to 84	106
85 and over	15
Less than 65	23
65 to 74	198

Average of Total of Conditions of Medicare patients treated by Dr. William Frederick Ergen, MD From 2018 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. William Frederick Ergen, MD treated were hypertension, high cholesterol, chronic kidney disease and diabetes.

Hypertension	70
High Cholesterol	67
Stroke	4
Ischemic Heart Disease	30
Depression	26
Chronic Kidney Disease	31
Asthma	8
Osteoporosis	8
Heart Failure	15
Chronic Obstructive Pulmonary Disease	17
Diabetes	30
Atrial Fibrillation	12
Dementia	7
Cancer	14

Education & Training

He completed residency at Vanderbilt University Medical Center. He is certified by the Gastroenterology and has a state license in Tennessee.

Residency: Vanderbilt University Medical Center (2015)

Board Certification: Gastroenterology

Licensed In: Tennessee

Affiliations & Hospitals

Dr. William Frederick Ergen, MD is associated with these hospitals and organizations:

Covenant Health

Fort Sanders Regional Medical Center

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General Payments

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

**Payments by Company**
AbbVie Inc.	$1,592 Rinvoq $510	Skyrizi $455	LINZESS $251	Creon $184	Humira $107	Other $85
Takeda Pharmaceuticals U.S.A., Inc.	$581 ENTYVIO $547	MOTEGRITY $22	$13
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$465 XIFAXAN $419	Trulance $46
Pfizer Inc.	$242 XELJANZ $141	VELSIPITY $51	INFLECTRA $25	XALKORI $13	$12
AbbVie, Inc.	$169 Humira $123	Mavyret $17	Creon $12	$18
Other	$1,251 ZENPEP $214	ZEPOSIA $137	VIBERZI $104	Injectafer $99	DUPIXENT $83	Other $613

**Types of Payments**
Food and Beverage	$4,210
Gift	$90

Research Payments

Dr. William Frederick Ergen, MD has received 15 research payments totaling $22,685.

Biography

Dr. William Ergen's medical specialty is adult gastroenterology. In his practice, Dr. Ergen focuses on colon cancer and inflammatory bowel disease. Dr. Ergen is professionally affiliated with Covenant Health. He has an open panel in Knoxville, TN according to Covenant Health. Dr. Ergen completed his residency training at Vanderbilt University Medical Center.