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Home > FL Providers > Neurosurgeons

Dr. John Terrill Main, DO

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Specializes in: Neurosurgery

Professional interests include: dislocation, spinal stenosis, fractures (broken bones), and more.

1725 Se 28th Loop Suite 102
Ocala, FL 34471

(352) 629-1743

Dr. John Terrill Main, DO is a neurosurgeon in Ocala, FL specializing in neurosurgery. Dr. John Terrill Main, DO is affiliated with HCA Florida Healthcare, HCA Florida Ocala Hospital, CORA HEALTH SERVICES, INC and OCALA HEALTH SURGICAL GROUP LLC.

Office Locations

HCA Florida Ocala Hospital

1725 Se 28th Loop Suite 102
Ocala, FL 34471

(352) 629-1743

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Noteworthy Medicare Patient Procedures Performed by Dr. John Terrill Main, DO in 2023

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

Top 25%

By Volume:

360-degree lumbar fusion

cervical spine surgery

inpatient hospital care

lumbar fusion

spinal fusion

spine surgery procedures

By Affordability:

hospital care

inpatient care

inpatient hospital care

In 2012, among providers in related specialties within Florida, Dr. John Terrill Main, DO performed more 360-degree lumbar fusion, cervical spine surgery, inpatient hospital care (for patient admitted to hospital), lumbar fusion, spinal fusion, and spine surgery procedures procedures for Medicare patients than 75% of them and he also had a list price for hospital care, inpatient care, and inpatient hospital care (for patient admitted to hospital) 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 Terrill Main, DO treated as a neurosurgeon in Ocala, FL during 2012 were spinal procedures, arthrodesis (bone fusion surgery), nerve procedures and decompression surgery.

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

arthrodesis (bone fusion surgery)	36
decompression surgery	32
doctor visit	370
minimally invasive procedures	18
neck surgery	18
nerve procedures	32
spinal procedures	78

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John Terrill Main, DO treated as a neurosurgeon in Ocala, FL during 2013 were spinal procedures, nerve procedures, decompression surgery and arthrodesis (bone fusion surgery).

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

arthrodesis (bone fusion surgery)	45
decompression surgery	46
doctor visit	467
minimally invasive procedures	21
neck surgery	24
nerve procedures	46
spinal procedures	141

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John Terrill Main, DO.

**Gender**
Male	136
Female	161

**Ethnicity**
Non-Hispanic White	231
Black	0
Hispanic	0
Asian	0
Other	0
Native American	54

**Age**
From 65 to 74	123
From 75 to 84	57
85 and over	15
Less than 65	102

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2013

Hypertension	72
High Cholesterol	47
Stroke	5
Ischemic Heart Disease	36
Depression	33
Chronic Kidney Disease	17
Asthma	9
Osteoperosis	8
Atrial Fibrilation	7
Heart Failure	17
Chronic Obstructive Pulmonary Disease	19
Diabetes	30
Dementia	8
Cancer	8

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John Terrill Main, DO treated as a neurosurgeon in Ocala, FL during 2014 were spinal procedures, nerve procedures, decompression surgery and arthrodesis (bone fusion surgery).

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

arthrodesis (bone fusion surgery)	40
aspiration	13
bone marrow tests	13
decompression surgery	51
doctor visit	485
minimally invasive procedures	13
neck surgery	27
nerve procedures	51
spinal procedures	115

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John Terrill Main, DO.

**Gender**
Male	140
Female	197

**Ethnicity**
Non-Hispanic White	264
Black	0
Hispanic	0
Asian	0
Other	0
Native American	47

**Age**
From 65 to 74	147
From 75 to 84	47
85 and over	12
Less than 65	131

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2014

Hypertension	74
High Cholesterol	46
Stroke	4
Ischemic Heart Disease	39
Depression	39
Chronic Kidney Disease	21
Asthma	11
Osteoperosis	9
Atrial Fibrilation	8
Heart Failure	14
Chronic Obstructive Pulmonary Disease	24
Diabetes	33
Dementia	5
Cancer	8

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John Terrill Main, DO treated as a neurosurgeon in Ocala, FL during 2015 were spinal procedures, rehabilitation, nerve procedures and decompression surgery.

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

arthrodesis (bone fusion surgery)	81
aspiration	13
bone marrow tests	13
decompression surgery	94
doctor visit	728
minimally invasive procedures	36
neck surgery	45
nerve procedures	94
rehabilitation	120
spinal procedures	305
X-rays	70

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John Terrill Main, DO.

**Gender**
Male	376
Female	574

**Ethnicity**
Non-Hispanic White	662
Black	102
Hispanic	0
Asian	0
Other	0
Native American	142

**Age**
From 65 to 74	338
From 75 to 84	150
85 and over	34
Less than 65	428

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2015

Hypertension	70
High Cholesterol	48
Stroke	4
Ischemic Heart Disease	32
Depression	40
Chronic Kidney Disease	20
Asthma	19
Osteoperosis	11
Atrial Fibrilation	6
Heart Failure	16
Chronic Obstructive Pulmonary Disease	20
Diabetes	35
Dementia	6
Cancer	6

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John Terrill Main, DO treated as a neurosurgeon in Ocala, FL during 2016 were spinal procedures, X-rays, nerve procedures and decompression surgery.

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

arthrodesis (bone fusion surgery)	82
decompression surgery	92
doctor visit	714
minimally invasive procedures	27
neck surgery	55
nerve procedures	92
spinal procedures	350
X-rays	103

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John Terrill Main, DO.

**Gender**
Male	187
Female	276

**Ethnicity**
Non-Hispanic White	331
Black	51
Hispanic	0
Asian	0
Other	0
Native American	65

**Age**
From 65 to 74	175
From 75 to 84	84
85 and over	17
Less than 65	187

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2016

Hypertension	71
High Cholesterol	48
Stroke	6
Ischemic Heart Disease	36
Depression	38
Chronic Kidney Disease	30
Asthma	25
Osteoperosis	12
Atrial Fibrilation	5
Heart Failure	17
Chronic Obstructive Pulmonary Disease	21
Diabetes	37
Dementia	8
Cancer	6

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John Terrill Main, DO treated as a neurosurgeon in Ocala, FL during 2017 were spinal procedures, X-rays, nerve procedures and decompression surgery.

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

arthrodesis (bone fusion surgery)	52
decompression surgery	60
doctor visit	672
minimally invasive procedures	16
neck surgery	22
nerve procedures	60
spinal procedures	305
X-rays	155

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John Terrill Main, DO.

**Gender**
Male	145
Female	255

**Ethnicity**
Non-Hispanic White	287
Black	33
Hispanic	0
Asian	0
Other	0
Native American	69

**Age**
From 65 to 74	165
From 75 to 84	0
85 and over	0
Less than 65	162

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2017

Hypertension	70
High Cholesterol	46
Stroke	5
Ischemic Heart Disease	37
Depression	41
Chronic Kidney Disease	28
Asthma	11
Osteoperosis	9
Atrial Fibrilation	4
Heart Failure	15
Chronic Obstructive Pulmonary Disease	20
Diabetes	35
Dementia	9
Cancer	5

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John Terrill Main, DO treated as a neurosurgeon in Ocala, FL during 2018 were spinal procedures, hospital care, inpatient care and arthrodesis (bone fusion surgery).

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

arthrodesis (bone fusion surgery)	32
doctor visit	220
hospital care	44
inpatient care	44
neck surgery	13
spinal procedures	71

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John Terrill Main, DO.

**Gender**
Male	118
Female	143

**Ethnicity**
Non-Hispanic White	227
Black	0
Hispanic	11
Asian	0
Other	0
Native American	11

**Age**
From 65 to 74	98
From 75 to 84	97
85 and over	26
Less than 65	40

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2018

Hypertension	75
High Cholesterol	75
Stroke	16
Ischemic Heart Disease	51
Depression	43
Chronic Kidney Disease	41
Asthma	8
Osteoperosis	11
Atrial Fibrilation	13
Heart Failure	23
Chronic Obstructive Pulmonary Disease	27
Diabetes	39
Dementia	21
Cancer	13

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John Terrill Main, DO treated as a neurosurgeon in Ocala, FL during 2019 were spinal procedures, arthrodesis (bone fusion surgery), nerve procedures and decompression surgery.

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

arthrodesis (bone fusion surgery)	52
decompression surgery	36
doctor visit	316
hospital care	18
inpatient care	18
neck surgery	31
nerve procedures	36
spinal procedures	120

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John Terrill Main, DO.

**Gender**
Male	123
Female	176

**Ethnicity**
Non-Hispanic White	271
Black	13
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	119
From 75 to 84	120
85 and over	26
Less than 65	34

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2019

Hypertension	75
High Cholesterol	75
Stroke	14
Ischemic Heart Disease	49
Depression	39
Chronic Kidney Disease	48
Asthma	9
Osteoperosis	12
Atrial Fibrilation	15
Heart Failure	23
Chronic Obstructive Pulmonary Disease	23
Diabetes	33
Dementia	15
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John Terrill Main, DO treated as a neurosurgeon in Ocala, FL during 2020 were spinal procedures, arthrodesis (bone fusion surgery), nerve procedures and decompression surgery.

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

arthrodesis (bone fusion surgery)	34
decompression surgery	13
doctor visit	179
neck surgery	13
nerve procedures	13
spinal procedures	100

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John Terrill Main, DO.

**Gender**
Male	106
Female	115

**Ethnicity**
Non-Hispanic White	199
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	76
From 75 to 84	83
85 and over	19
Less than 65	43

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2020

Hypertension	75
High Cholesterol	75
Stroke	12
Ischemic Heart Disease	47
Depression	37
Chronic Kidney Disease	42
Asthma	8
Osteoperosis	13
Atrial Fibrilation	14
Heart Failure	25
Chronic Obstructive Pulmonary Disease	19
Diabetes	31
Dementia	14
Cancer	10

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John Terrill Main, DO treated as a neurosurgeon in Ocala, FL during 2021 were spinal procedures, arthrodesis (bone fusion surgery), nerve procedures and decompression surgery.

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

arthrodesis (bone fusion surgery)	33
decompression surgery	11
doctor visit	198
neck surgery	11
nerve procedures	11
spinal procedures	71

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John Terrill Main, DO.

**Gender**
Male	90
Female	123

**Ethnicity**
Non-Hispanic White	187
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	68
From 75 to 84	82
85 and over	26
Less than 65	37

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2021

Hypertension	75
High Cholesterol	75
Stroke	20
Ischemic Heart Disease	55
Depression	45
Chronic Kidney Disease	45
Asthma	7
Osteoperosis	14
Atrial Fibrilation	16
Heart Failure	27
Chronic Obstructive Pulmonary Disease	27
Diabetes	36
Dementia	20
Cancer	15

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John Terrill Main, DO treated as a neurosurgeon in Ocala, FL during 2022 were spinal procedures, arthrodesis (bone fusion surgery), hospital care and inpatient care.

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

arthrodesis (bone fusion surgery)	29
doctor visit	117
hospital care	17
inpatient care	17
neck surgery	13
spinal procedures	64

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John Terrill Main, DO.

**Gender**
Male	82
Female	104

**Ethnicity**
Non-Hispanic White	167
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	64
From 75 to 84	73
85 and over	27
Less than 65	22

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2022

Hypertension	75
High Cholesterol	75
Stroke	34
Ischemic Heart Disease	48
Depression	41
Chronic Kidney Disease	38
Asthma	9
Osteoperosis	20
Atrial Fibrilation	30
Heart Failure	23
Chronic Obstructive Pulmonary Disease	30
Diabetes	33
Dementia	18
Cancer	17

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. John Terrill Main, DO for Medicare patients.

The highest averages for the top procedures that Dr. John Terrill Main, DO treated as a neurosurgeon in Ocala, FL were spinal procedures, rehabilitation, X-rays and nerve procedures.

arthrodesis (bone fusion surgery)	46
aspiration	13
bone marrow tests	13
decompression surgery	48
doctor visit	406
hospital care	26
inpatient care	26
minimally invasive procedures	21
neck surgery	24
nerve procedures	48
rehabilitation	120
spinal procedures	156
X-rays	109

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John Terrill Main, DO.

**Gender**
Male	136
Female	193

**Ethnicity**
Black / African American	18
Asian / Pacific Islander	0
Non-Hispanic White	256
Native American / Alaskan Native	35
Hispanic	1
Other	0

**Age**
75 to 84	72
85 and over	18
Less than 65	107
65 to 74	124

Average of Total of Conditions of Medicare patients treated by Dr. John Terrill Main, DO From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. John Terrill Main, DO treated were hypertension, high cholesterol, ischemic heart disease and depression.

Hypertension	66
High Cholesterol	55
Stroke	10
Ischemic Heart Disease	39
Depression	36
Chronic Kidney Disease	30
Asthma	10
Osteoporosis	10
Heart Failure	18
Chronic Obstructive Pulmonary Disease	20
Diabetes	31
Atrial Fibrillation	10
Dementia	11
Cancer	9

Education & Training

He completed residency at Hahnemann University Hospital. He has a state license in Oklahoma.

Residency: Hahnemann University Hospital (2004)

Licensed In: Oklahoma

Affiliations & Hospitals

Dr. John Terrill Main, DO is associated with these hospitals and organizations:

HCA Florida Healthcare

HCA Florida Ocala Hospital

CORA HEALTH SERVICES, INC

OCALA HEALTH SURGICAL GROUP LLC

Ratings & Reviews

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General Payments

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

**Payments by Company**
Omnia Medical, LLC	$1,254,000 $1,254,000
Mid America Management, LLC	$822,644 Surgical Implants $822,644
Centinel Spine, Inc.	$9,168 STALIF L $5,000	STALIF C $4,000	MIDLINE II-Ti $168
NUVASIVE, INC.	$1,793 Thoracolumbar $1,793
Centinel Spine, LLC	$438 STALIF C $173	PRODISC L $155	PRODISC C $110
Other	$1,701 PAIN MANAGEMENT $199	Senza Spinal Cord Stimulation System $115	Cervical-Stim Osteogenesis Stimulator $105	Surgical planning and navigation radiation treatment planning and positioning $81	PROCLAIM $76	Other $1,125

**Types of Payments**
Acquisitions	$1,254,000
Education	$822,644
Consulting Fee	$9,000
Food and Beverage	$2,369
Travel and Lodging	$1,698
Other	$33

Biography

Dr. John Main practices neurosurgery in Ocala, FL. These areas are among Dr. Main's clinical interests: vertebroplasty, dislocation, and medical exams. For his professional training, Dr. Main completed a residency program at Hahnemann University Hospital. He is affiliated with HCA Florida Healthcare.

Select Year:

Dr. John Terrill Main, DO

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. John Terrill Main, DO in 2023

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 Terrill Main, DO in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Terrill Main, DO in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Terrill Main, DO 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 Terrill Main, DO From 2012 - 2022

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography

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