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Dr. John A.H. Clark, MD

(Dr. John AH Clark, M.D.)

(No ratings)

Specializes in: Internal Medicine (Adult Medicine) and Nephrology (Kidney Disease)

2780 Bob Wallace Avenue
Huntsville, AL 35805

(256) 533-4626

Dr. John A.H. Clark, MD is an internist in Huntsville, AL specializing in internal medicine (adult medicine) and nephrology (kidney disease).

Office Locations

2780 Bob Wallace Avenue
Huntsville, AL 35805

(256) 533-4626

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Noteworthy Medicare Patient Procedures Performed by Dr. John A.H. Clark, MD in 2023

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

Top 10%

By Volume:

dialysis

In 2023, Dr. John A.H. Clark, MD performed more dialysis procedures for Medicare patients than 90% of providers in related specialties within Alabama.

Top 25%

By Volume:

extremity arteriogram

By Affordability:

lab tests

urinalysis

urine tests

In 2012, among providers in related specialties within Alabama, Dr. John A.H. Clark, MD performed more extremity arteriogram procedures for Medicare patients than 75% of them and he also had a list price for lab tests, urinalysis, and urine tests 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

2012 Medicare Procedure Volume

The top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL during 2012 were hospital care, inpatient care, lab tests and dialysis.

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

angioplasty	180
device removal	20
dialysis	299
dialysis access procedures	203
doctor visit	648
hemofiltration	55
hospital care	874
inpatient care	874
lab tests	633
minimally invasive procedures	201
thrombectomy (blood clot removal)	15
vascular procedures	235
X-rays	174

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL during 2013 were hospital care, inpatient care, lab tests and dialysis.

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

angioplasty	216
catheterization	15
device removal	14
dialysis	381
dialysis access procedures	239
doctor visit	628
hemofiltration	55
hospital care	959
inpatient care	945
lab tests	447
minimally invasive procedures	141
outpatient care	14
ultrasound (sonogram)	13
vascular procedures	283
X-rays	189

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John A.H. Clark, MD.

**Gender**
Male	418
Female	414

**Ethnicity**
Non-Hispanic White	595
Black	220
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	238
From 75 to 84	261
85 and over	95
Less than 65	238

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2013

Hypertension	75
High Cholesterol	66
Stroke	11
Ischemic Heart Disease	57
Depression	19
Chronic Kidney Disease	75
Asthma	8
Osteoperosis	6
Atrial Fibrilation	19
Heart Failure	51
Chronic Obstructive Pulmonary Disease	25
Diabetes	60
Dementia	13
Cancer	11

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL during 2014 were hospital care, inpatient care, lab tests and vascular procedures.

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

angioplasty	237
catheterization	36
device removal	12
dialysis	341
dialysis access procedures	271
doctor visit	579
hemofiltration	143
hospital care	901
inpatient care	890
lab tests	483
minimally invasive procedures	192
outpatient care	11
thrombectomy (blood clot removal)	26
vascular procedures	371
X-rays	192

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John A.H. Clark, MD.

**Gender**
Male	389
Female	422

**Ethnicity**
Non-Hispanic White	583
Black	204
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	278
From 75 to 84	249
85 and over	86
Less than 65	198

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2014

Hypertension	75
High Cholesterol	70
Stroke	11
Ischemic Heart Disease	58
Depression	21
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	7
Atrial Fibrilation	17
Heart Failure	49
Chronic Obstructive Pulmonary Disease	25
Diabetes	60
Dementia	14
Cancer	10

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL during 2015 were inpatient care, hospital care, lab tests and vascular procedures.

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

angioplasty	239
catheterization	55
device removal	13
dialysis	250
dialysis access procedures	283
doctor visit	598
hemofiltration	66
hospital care	983
inpatient care	983
lab tests	460
minimally invasive procedures	196
thrombectomy (blood clot removal)	28
vascular procedures	384
X-rays	211

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John A.H. Clark, MD.

**Gender**
Male	866
Female	912

**Ethnicity**
Non-Hispanic White	1308
Black	432
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	578
From 75 to 84	532
85 and over	200
Less than 65	468

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2015

Hypertension	75
High Cholesterol	73
Stroke	11
Ischemic Heart Disease	60
Depression	22
Chronic Kidney Disease	75
Asthma	16
Osteoperosis	5
Atrial Fibrilation	19
Heart Failure	54
Chronic Obstructive Pulmonary Disease	27
Diabetes	62
Dementia	14
Cancer	11

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL during 2016 were inpatient care, hospital care, lab tests and dialysis.

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

angioplasty	231
catheterization	46
device removal	19
dialysis	381
dialysis access procedures	266
doctor visit	579
hemofiltration	112
hospital care	1078
inpatient care	1078
lab tests	445
minimally invasive procedures	144
thrombectomy (blood clot removal)	21
vascular procedures	329
X-rays	220

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John A.H. Clark, MD.

**Gender**
Male	456
Female	453

**Ethnicity**
Non-Hispanic White	645
Black	238
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	306
From 75 to 84	273
85 and over	99
Less than 65	231

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2016

Hypertension	75
High Cholesterol	72
Stroke	12
Ischemic Heart Disease	58
Depression	25
Chronic Kidney Disease	75
Asthma	29
Osteoperosis	5
Atrial Fibrilation	19
Heart Failure	50
Chronic Obstructive Pulmonary Disease	27
Diabetes	61
Dementia	16
Cancer	11

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL during 2017 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

catheterization	34
device removal	30
dialysis	434
doctor visit	510
hemofiltration	92
hospital care	1150
inpatient care	1150
lab tests	372
minimally invasive procedures	156
vascular procedures	47

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John A.H. Clark, MD.

**Gender**
Male	455
Female	453

**Ethnicity**
Non-Hispanic White	643
Black	246
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	303
From 75 to 84	253
85 and over	108
Less than 65	244

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2017

Hypertension	75
High Cholesterol	69
Stroke	12
Ischemic Heart Disease	57
Depression	26
Chronic Kidney Disease	75
Asthma	8
Osteoperosis	6
Atrial Fibrilation	20
Heart Failure	51
Chronic Obstructive Pulmonary Disease	26
Diabetes	62
Dementia	16
Cancer	11

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL during 2018 were hospital care, inpatient care, lab tests and dialysis.

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

catheterization	21
device removal	21
dialysis	339
doctor visit	512
hemofiltration	68
hospital care	1003
inpatient care	1003
lab tests	372
minimally invasive procedures	143
vascular procedures	59

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John A.H. Clark, MD.

**Gender**
Male	465
Female	456

**Ethnicity**
Non-Hispanic White	648
Black	246
Hispanic	15
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	303
From 75 to 84	285
85 and over	94
Less than 65	239

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2018

Hypertension	75
High Cholesterol	74
Stroke	11
Ischemic Heart Disease	59
Depression	26
Chronic Kidney Disease	75
Asthma	8
Osteoperosis	8
Atrial Fibrilation	21
Heart Failure	54
Chronic Obstructive Pulmonary Disease	28
Diabetes	61
Dementia	17
Cancer	11

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL during 2019 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

catheterization	39
device removal	26
dialysis	383
doctor visit	404
hemofiltration	56
hospital care	1113
inpatient care	1113
lab tests	89
minimally invasive procedures	20
vascular procedures	59

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John A.H. Clark, MD.

**Gender**
Male	403
Female	402

**Ethnicity**
Non-Hispanic White	564
Black	215
Hispanic	14
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	270
From 75 to 84	242
85 and over	94
Less than 65	199

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2019

Hypertension	75
High Cholesterol	75
Stroke	11
Ischemic Heart Disease	58
Depression	27
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	7
Atrial Fibrilation	22
Heart Failure	52
Chronic Obstructive Pulmonary Disease	29
Diabetes	64
Dementia	17
Cancer	12

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL during 2020 were hospital care, inpatient care, dialysis and vascular procedures.

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

catheterization	36
device removal	14
dialysis	282
dialysis access procedures	22
doctor visit	325
hemofiltration	65
hospital care	808
inpatient care	808
lab tests	18
ultrasound (sonogram)	22
vascular procedures	82

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John A.H. Clark, MD.

**Gender**
Male	359
Female	302

**Ethnicity**
Non-Hispanic White	458
Black	179
Hispanic	13
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	220
From 75 to 84	209
85 and over	75
Less than 65	157

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2020

Hypertension	75
High Cholesterol	74
Stroke	11
Ischemic Heart Disease	63
Depression	24
Chronic Kidney Disease	75
Asthma	8
Osteoperosis	5
Atrial Fibrilation	20
Heart Failure	52
Chronic Obstructive Pulmonary Disease	25
Diabetes	59
Dementia	17
Cancer	13

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL during 2021 were hospital care, inpatient care, dialysis and vascular procedures.

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

catheterization	34
device removal	17
dialysis	213
doctor visit	335
hemofiltration	35
hospital care	721
inpatient care	721
lab tests	26
vascular procedures	44

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John A.H. Clark, MD.

**Gender**
Male	336
Female	280

**Ethnicity**
Non-Hispanic White	435
Black	156
Hispanic	12
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	209
From 75 to 84	204
85 and over	85
Less than 65	118

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2021

Hypertension	75
High Cholesterol	75
Stroke	10
Ischemic Heart Disease	60
Depression	23
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	6
Atrial Fibrilation	22
Heart Failure	51
Chronic Obstructive Pulmonary Disease	24
Diabetes	62
Dementia	16
Cancer	11

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL during 2022 were hospital care, inpatient care, dialysis and hemofiltration.

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

dialysis	211
doctor visit	341
hemofiltration	42
hospital care	830
inpatient care	830
lab tests	20
vascular procedures	21

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John A.H. Clark, MD.

**Gender**
Male	309
Female	272

**Ethnicity**
Non-Hispanic White	425
Black	137
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	187
From 75 to 84	200
85 and over	92
Less than 65	102

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	14
Ischemic Heart Disease	51
Depression	23
Chronic Kidney Disease	75
Asthma	9
Osteoperosis	11
Atrial Fibrilation	39
Heart Failure	46
Chronic Obstructive Pulmonary Disease	28
Diabetes	57
Dementia	13
Cancer	16

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. John A.H. Clark, MD for Medicare patients.

The highest averages for the top procedures that Dr. John A.H. Clark, MD treated as an internist in Huntsville, AL were hospital care, inpatient care, dialysis and lab tests.

angioplasty	220
catheterization	35
device removal	18
dialysis	319
dialysis access procedures	214
doctor visit	496
hemofiltration	71
hospital care	947
inpatient care	945
lab tests	305
minimally invasive procedures	149
outpatient care	12
thrombectomy (blood clot removal)	22
ultrasound (sonogram)	17
vascular procedures	174
X-rays	197

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John A.H. Clark, MD.

**Gender**
Male	405
Female	396

**Ethnicity**
Black / African American	206
Asian / Pacific Islander	0
Non-Hispanic White	573
Native American / Alaskan Native	0
Hispanic	4
Other	0

**Age**
75 to 84	246
85 and over	93
Less than 65	199
65 to 74	262

Average of Total of Conditions of Medicare patients treated by Dr. John A.H. Clark, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. John A.H. Clark, MD treated were chronic kidney disease, hypertension, high cholesterol and diabetes.

Hypertension	68
High Cholesterol	65
Stroke	10
Ischemic Heart Disease	52
Depression	21
Chronic Kidney Disease	68
Asthma	9
Osteoporosis	6
Heart Failure	46
Chronic Obstructive Pulmonary Disease	24
Diabetes	55
Atrial Fibrillation	19
Dementia	13
Cancer	10

Education & Training

He has a state license in Tennessee.

Licensed In: Tennessee

Ratings & Reviews

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General Payments

These charts describe general payments received by Dr. John A.H. Clark, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
Medtronic, Inc.	$1,632 VenaSeal $1,506	ELLIPSYS VASCULAR ACCESS SYSTEM $59	Ellipsys $51	Chameleon $17
Bard Peripheral Vascular, Inc.	$1,376 WAVELINQ $286	VENAFLO $23	LUTONIX $19	FLUENCY $16	$1,032
Amgen Inc.	$568 Parsabiv $362	Sensipar $140	Tavneos $67
Otsuka America Pharmaceutical, Inc.	$483 JYNARQUE $282	SAMSCA $201
Bayer HealthCare Pharmaceuticals Inc.	$372 Kerendia $372
Other	$3,712 VELTASSA $540	Rayaldee $342	LOKELMA $260	Ellipsys $241	Auryxia $217	Other $2,114

**Types of Payments**
Food and Beverage	$6,184
Travel and Lodging	$1,811
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$125
Education	$24

Research Payments

Dr. John A.H. Clark, MD has received 11 research payments totaling $178,390.

Biography

Dr. John Clark is a physician who specializes in nephrology (kidney disease). He attended medical school at the University of Alabama at Birmingham School of Medicine.

Select Year:

Dr. John A.H. Clark, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. John A.H. Clark, 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. John A.H. Clark, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John A.H. Clark, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John A.H. Clark, 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. John A.H. Clark, MD From 2012 - 2022

Education & Training

Ratings & Reviews

General Payments

Research Payments

Biography

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