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Home > OH Providers > Optometrists

Dr. John William Barnhart, OD

(Dr. John W. Barnhart, O.D.)

(5 Ratings)

Specializes in: Optometry (Primary Eye Care)

Ohio State University College of Optometry (1991)

4620 Mahoning Avenue Nw
Warren, OH 44483

(330) 847-9093

Dr. John William Barnhart, OD is an optometrist in Warren, OH specializing in optometry (primary eye care). He graduated from Ohio State University College of Optometry in 1991 and has 35 years of experience.

Office Locations

4620 Mahoning Avenue Nw
Warren, OH 44483

(330) 847-9093

(330) 847-2225

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Noteworthy Medicare Patient Procedures Performed by Dr. John William Barnhart, OD in 2024

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

Top 25%

By Affordability:

visual field test

In 2012, Dr. John William Barnhart, OD had a list price for visual field test that was lower than the list prices billed to Medicare by 75% of providers in related specialties within Ohio. 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 William Barnhart, OD treated as an optometrist in Warren, OH during 2012 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	55
eye procedures	215

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2013 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	92
eye procedures	229

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	57
Female	90

**Age**
From 65 to 74	69
From 75 to 84	39
85 and over	17
Less than 65	22

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2013

Hypertension	63
High Cholesterol	59
Stroke	7
Ischemic Heart Disease	30
Depression	14
Chronic Kidney Disease	13
Asthma	10
Osteoperosis	0
Atrial Fibrilation	12
Heart Failure	12
Chronic Obstructive Pulmonary Disease	12
Diabetes	29
Dementia	11
Cancer	0

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2014 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	70
eye procedures	286

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	60
Female	85

**Age**
From 65 to 74	74
From 75 to 84	39
85 and over	13
Less than 65	19

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2014

Hypertension	63
High Cholesterol	58
Stroke	0
Ischemic Heart Disease	32
Depression	15
Chronic Kidney Disease	8
Asthma	0
Osteoperosis	8
Atrial Fibrilation	11
Heart Failure	12
Chronic Obstructive Pulmonary Disease	17
Diabetes	26
Dementia	9
Cancer	8

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2015 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	56
eye procedures	192

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	108
Female	144

**Age**
From 65 to 74	136
From 75 to 84	76
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2015

Hypertension	69
High Cholesterol	56
Stroke	10
Ischemic Heart Disease	28
Depression	13
Chronic Kidney Disease	14
Asthma	0
Osteoperosis	0
Atrial Fibrilation	9
Heart Failure	0
Chronic Obstructive Pulmonary Disease	11
Diabetes	21
Dementia	0
Cancer	13

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2016 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	46
eye procedures	281

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	62
Female	89

**Ethnicity**
Non-Hispanic White	140
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

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

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2016

Hypertension	62
High Cholesterol	55
Stroke	0
Ischemic Heart Disease	25
Depression	19
Chronic Kidney Disease	19
Asthma	14
Osteoperosis	0
Atrial Fibrilation	9
Heart Failure	10
Chronic Obstructive Pulmonary Disease	13
Diabetes	25
Dementia	11
Cancer	0

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2017 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	60
eye procedures	335

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	72
Female	108

**Ethnicity**
Non-Hispanic White	169
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	90
From 75 to 84	54
85 and over	13
Less than 65	23

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2017

Hypertension	66
High Cholesterol	51
Stroke	7
Ischemic Heart Disease	28
Depression	19
Chronic Kidney Disease	26
Asthma	0
Osteoperosis	8
Atrial Fibrilation	14
Heart Failure	14
Chronic Obstructive Pulmonary Disease	12
Diabetes	24
Dementia	10
Cancer	12

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2018 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	72
eye procedures	318

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	64
Female	103

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

**Age**
From 65 to 74	93
From 75 to 84	51
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2018

Hypertension	60
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	22
Depression	19
Chronic Kidney Disease	21
Asthma	0
Osteoperosis	0
Atrial Fibrilation	7
Heart Failure	9
Chronic Obstructive Pulmonary Disease	9
Diabetes	23
Dementia	9
Cancer	7

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2019 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	78
eye procedures	338

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	63
Female	99

**Ethnicity**
Non-Hispanic White	151
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	83
From 75 to 84	51
85 and over	13
Less than 65	15

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2019

Hypertension	68
High Cholesterol	67
Stroke	9
Ischemic Heart Disease	31
Depression	22
Chronic Kidney Disease	22
Asthma	0
Osteoperosis	8
Atrial Fibrilation	10
Heart Failure	11
Chronic Obstructive Pulmonary Disease	14
Diabetes	27
Dementia	8
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2020 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	80
eye procedures	261

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	65
Female	94

**Age**
From 65 to 74	85
From 75 to 84	52
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2020

Hypertension	65
High Cholesterol	63
Stroke	0
Ischemic Heart Disease	28
Depression	20
Chronic Kidney Disease	21
Asthma	0
Osteoperosis	0
Atrial Fibrilation	9
Heart Failure	9
Chronic Obstructive Pulmonary Disease	10
Diabetes	29
Dementia	0
Cancer	12

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2021 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	84
eye procedures	292

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	76
Female	100

**Ethnicity**
Non-Hispanic White	163
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	89
From 75 to 84	60
85 and over	15
Less than 65	12

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2021

Hypertension	64
High Cholesterol	63
Stroke	6
Ischemic Heart Disease	30
Depression	20
Chronic Kidney Disease	25
Asthma	0
Osteoperosis	0
Atrial Fibrilation	10
Heart Failure	13
Chronic Obstructive Pulmonary Disease	12
Diabetes	30
Dementia	8
Cancer	10

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2022 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	89
eye procedures	290

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	77
Female	108

**Ethnicity**
Non-Hispanic White	172
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	96
From 75 to 84	65
85 and over	13
Less than 65	11

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2022

Hypertension	75
High Cholesterol	75
Stroke	10
Ischemic Heart Disease	26
Depression	20
Chronic Kidney Disease	22
Asthma	8
Osteoperosis	9
Atrial Fibrilation	15
Heart Failure	12
Chronic Obstructive Pulmonary Disease	16
Diabetes	30
Dementia	6
Cancer	17

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2023 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	121
eye procedures	2220

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	88
Female	111

**Ethnicity**
Non-Hispanic White	186
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	104
From 75 to 84	68
85 and over	13
Less than 65	14

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2023

Hypertension	74
High Cholesterol	75
Stroke	8
Ischemic Heart Disease	25
Depression	15
Chronic Kidney Disease	18
Asthma	8
Osteoperosis	13
Atrial Fibrilation	15
Heart Failure	14
Chronic Obstructive Pulmonary Disease	21
Diabetes	28
Dementia	7
Cancer	18

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH during 2024 were eye procedures.

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

doctor visit	131
eye procedures	282

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Male	87
Female	103

**Age**
From 65 to 74	91
From 75 to 84	72
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2024

Hypertension	75
High Cholesterol	75
Stroke	9
Ischemic Heart Disease	25
Depression	15
Chronic Kidney Disease	21
Asthma	13
Osteoperosis	13
Atrial Fibrilation	13
Heart Failure	14
Chronic Obstructive Pulmonary Disease	19
Diabetes	28
Dementia	6
Cancer	18

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. John William Barnhart, OD for Medicare patients.

The highest averages for the top procedures that Dr. John William Barnhart, OD treated as an optometrist in Warren, OH were eye procedures.

doctor visit	79
eye procedures	426

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. John William Barnhart, OD.

**Gender**
Female	94
Male	67

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	87
Hispanic	0
Native American / Alaskan Native	0
Other	0

**Age**
85 and over	7
75 to 84	51
Less than 65	8
65 to 74	83

Average of Total of Conditions of Medicare patients treated by Dr. John William Barnhart, OD From 2012 - 2024

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

Hypertension	61
High Cholesterol	58
Stroke	5
Ischemic Heart Disease	25
Depression	16
Chronic Kidney Disease	17
Asthma	4
Osteoporosis	4
Heart Failure	10
Chronic Obstructive Pulmonary Disease	12
Diabetes	24
Atrial Fibrillation	10
Dementia	6
Cancer	9

Education & Training

Dr. John William Barnhart, OD graduated from Ohio State University College of Optometry in 1991. He has a state license in Ohio.

Medical School: Ohio State University College of Optometry (1991)

Licensed In: Ohio

Ratings & Reviews

Dr. John William Barnhart, OD has a high overall rating with an average of 3.5 out of 5 stars based on 5 ratings. We collect ratings and reviews of Dr. John William Barnhart, OD from all over the web to help you find the right in Warren, OH.

3.5

Overall Rating

(5 Ratings)

Leave a Review

General Payments

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

**Payments by Company**
Coopervision Inc.	$1,313 Clariti Contact Lens $539	MyDay Contact Lens $294	MiSight Contact Lens $144	CVI Contact Lens $97	Multiple Brands Contact Lens $87	Other $154
Alcon Vision LLC	$1,007 Precision 1 $280	Precision7 $279	DAILIES TOTAL1 $124	Hydrus Microstent $123	iLux $109	Other $92
Alcon Laboratories Inc	$940 Contact Lenses $336	DAILIES $120	ReSTOR $20	$464
Bausch & Lomb, a division of Bausch Health US, LLC	$447 ULTRA $327	BTOD $121
Valeant Pharmaceuticals North America LLC	$399 ULTRA $358	BIOTRUE ONE DAY $21	BTOD $19
Other	$1,388 Infuse $250	XIIDRA $229	Soft contact lenses $124	RESTASIS $115	AmnioGuard $110	Other $560

**Types of Payments**
Food and Beverage	$5,345
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$60
Gift	$52
Education	$38

Biography

Dr. John Barnhart is an optometry (primary eye care) specialist in Warren, OH. Patients gave Dr. Barnhart an average rating of 3.5 stars (out of 5).

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Dr. John William Barnhart, OD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. John William Barnhart, OD in 2024

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 William Barnhart, OD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2022

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

2023 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2023

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

2024 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John William Barnhart, OD in 2024

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Average Medicare Patient Data From 2012 - 2024

Average of Total of Conditions of Medicare patients treated by Dr. John William Barnhart, OD From 2012 - 2024

Education & Training

Ratings & Reviews

General Payments

Biography

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