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Home > NH Providers > Neurosurgeons

Dr. Gareth Davies, MD

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Specializes in: Neurosurgery

Dartmouth Medical School (2008)

Professional interests include: brain surgery, meningioma, osteoarthritis, and more.

330 Borthwick Avenue Suite 300
Portsmouth, NH 03801

(603) 433-4666

Dr. Gareth Davies, MD is a neurosurgeon in Portsmouth, NH specializing in neurosurgery. He graduated from Dartmouth Medical School in 2008 and has 17 years of experience. Dr. Gareth Davies, MD is affiliated with Portsmouth Regional Hospital, APPLEDORE MEDICAL GROUP INC and Portsmouth Regional Hospital.

Office Locations

Address:

330 Borthwick Avenue Suite 300
Portsmouth, NH 03801

Some issues Dr. Gareth Davies, MD can help you with:

Deep Brain Stimulation (DBS)

Deep brain stimulation (DBS) is a procedure performed to help treat neurological conditions such as Parkinson's disease and epilepsy. Electrode leads are surgically implanted in the brain and connected to a device, called a neurostimulator (deep brain stimulator), that is placed underneath the skin (subcutaneously). The deep brain stimulator can send electrical signals through the electrodes to the brain to restore normal rhythms, or it can block electrical signals in specific areas of the brain to restore functioning. Although not a cure, DBS can treat symptoms of movement disorders such as pain and tremor when medication fails to work.

DBS surgery may be completed in one operating session, but it is more commonly performed in two parts. In the first stage of the procedure, the surgeon will map targets in the brain using CT or MRI imaging to determine where to place the electrodes. Then, by drilling holes into the skull, the surgeon will place the electrodes into specific areas in the brain. The holes will be closed, and patients will require 1-2 days to recover in the hospital. After about two weeks, patients will undergo another surgery to have the deep brain stimulator implanted. The stimulator is usually placed under the skin around the collarbone, chest, or abdomen, and it will be connected to the DBS electrodes through a subcutaneous wire. No component of the DBS system will be visible from outside. Following stimulator implantation, patients may need to recover in the hospital for 1-2 days.

Within 2-4 weeks of the operation, doctors will program the stimulator using a wireless device. Patients will work with their doctor to determine the most effective settings for the stimulator during follow-up visits. Patients will be given a handheld device so that they can turn the stimulator on or off and adjust its settings themselves. The stimulator may have a rechargeable battery, in which case patients will be given a charging unit. Stimulator batteries generally need to be replaced in 3-5 years.

Hydrocephalus

Normally, the brain is bathed in a liquid called cerebrospinal fluid. This fluid cushions and nurtures the brain cells as it flows around and through the brain. Sometimes, cerebrospinal fluid does not get reabsorbed into the body properly, or a blockage in the brain can stop it from flowing. This causes a buildup of pressure called hydrocephalus. This condition affects a wide range of people, but it is much more prevalent among infants and older adults. Left untreated, hydrocephalus can cause uncomfortable symptoms, such as headaches and blurred vision, and eventually may cause brain damage.

Hydrocephalus is most often treated with an implanted device called a shunt. A shunt is a long, thin tube that is used to drain excess fluid. One end is placed within the brain. The tube runs under the skin, along the neck behind the ear, and to another part of the body where the fluid can be reabsorbed. Most often this is the abdomen, but the chest or other areas can also be used. Shunts have a valve that allows doctors to monitor and control the pressure within the brain. Insertion of a shunt is a surgical procedure that takes one to two hours. Incisions are made in the head and the abdomen, and the shunt is threaded into place before the openings are stitched closed.

In cases where hydrocephalus is caused by a blockage, a procedure called endoscopic third ventriculostomy, or ETV, may be performed. During this procedure, a surgeon makes a dime-sized hole in the skull and uses a thin tube with a camera on the end (called an endoscope) to see inside the brain. The surgeon punctures a hole in the floor of the third ventricle, a fluid-filled space within the brain. The hole provides an opening for cerebrospinal fluid to flow around the blockage, normalizing pressure. The entire procedure usually takes less than an hour and patients can often go home the following day. ETV can provide a permanent and safe alternative to a shunt, but it is only useful for patients whose hydrocephalus is caused by a blockage.

doctor visit	119
hospital care	99
inpatient care	99

**Gender**
Male	146
Female	114

**Age**
From 65 to 74	68
From 75 to 84	100
85 and over	30
Less than 65	62

Hypertension	72
High Cholesterol	58
Stroke	25
Ischemic Heart Disease	26
Depression	36
Chronic Kidney Disease	19
Asthma	15
Osteoperosis	0
Atrial Fibrilation	12
Heart Failure	13
Chronic Obstructive Pulmonary Disease	17
Diabetes	25
Dementia	18
Cancer	14

doctor visit	331
hospital care	188
inpatient care	188

**Gender**
Male	163
Female	140

**Age**
From 65 to 74	108
From 75 to 84	84
85 and over	38
Less than 65	73

Hypertension	72
High Cholesterol	61
Stroke	16
Ischemic Heart Disease	38
Depression	42
Chronic Kidney Disease	31
Asthma	24
Osteoperosis	9
Atrial Fibrilation	18
Heart Failure	21
Chronic Obstructive Pulmonary Disease	20
Diabetes	32
Dementia	20
Cancer	12

doctor visit	277
hospital care	85
inpatient care	85

**Gender**
Male	144
Female	146

**Ethnicity**
Non-Hispanic White	277
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	107
From 75 to 84	93
85 and over	33
Less than 65	57

Hypertension	75
High Cholesterol	52
Stroke	16
Ischemic Heart Disease	31
Depression	43
Chronic Kidney Disease	26
Asthma	8
Osteoperosis	8
Atrial Fibrilation	13
Heart Failure	14
Chronic Obstructive Pulmonary Disease	17
Diabetes	27
Dementia	17
Cancer	12

decompression surgery	10
doctor visit	353
hospital care	102
implant surgery	13
inpatient care	102
nerve procedures	10
neurostimulator lead placement	13
neurostimulator replacement	13
spinal procedures	36

**Gender**
Male	146
Female	169

**Ethnicity**
Non-Hispanic White	304
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	103
From 75 to 84	106
85 and over	41
Less than 65	65

Hypertension	69
High Cholesterol	58
Stroke	17
Ischemic Heart Disease	31
Depression	43
Chronic Kidney Disease	29
Asthma	9
Osteoperosis	10
Atrial Fibrilation	16
Heart Failure	18
Chronic Obstructive Pulmonary Disease	19
Diabetes	24
Dementia	14
Cancer	14

decompression surgery	10
doctor visit	321
hospital care	81
implant surgery	10
inpatient care	81
nerve procedures	10
neurostimulator replacement	10
spinal procedures	19

**Gender**
Male	155
Female	143

**Ethnicity**
Non-Hispanic White	283
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	116
From 75 to 84	95
85 and over	33
Less than 65	54

Hypertension	72
High Cholesterol	62
Stroke	11
Ischemic Heart Disease	36
Depression	40
Chronic Kidney Disease	31
Asthma	7
Osteoperosis	10
Atrial Fibrilation	16
Heart Failure	21
Chronic Obstructive Pulmonary Disease	16
Diabetes	30
Dementia	16
Cancer	13

doctor visit	329
hospital care	80
implant surgery	12
inpatient care	80
neurostimulator lead placement	10
neurostimulator replacement	12
spinal procedures	21

**Gender**
Male	138
Female	146

**Ethnicity**
Non-Hispanic White	269
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	121
From 75 to 84	91
85 and over	27
Less than 65	45

Hypertension	69
High Cholesterol	56
Stroke	16
Ischemic Heart Disease	35
Depression	38
Chronic Kidney Disease	30
Asthma	6
Osteoperosis	8
Atrial Fibrilation	12
Heart Failure	15
Chronic Obstructive Pulmonary Disease	13
Diabetes	32
Dementia	11
Cancer	13

decompression surgery	16
doctor visit	618
hospital care	50
implant surgery	38
inpatient care	50
nerve procedures	16
neurostimulator lead placement	33
neurostimulator replacement	38
spinal procedures	87

Average Medicare Procedure Volume From 2015 - 2021

Volume of procedures performed by Dr. Gareth Davies, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gareth Davies, MD treated as a neurosurgeon in Portsmouth, NH were hospital care, inpatient care, spinal procedures and neurostimulator lead placement.

decompression surgery	12
doctor visit	335
hospital care	97
implant surgery	18
inpatient care	97
nerve procedures	12
neurostimulator lead placement	18
neurostimulator replacement	18
spinal procedures	41

Average Medicare Patient Data From 2015 - 2021

Information about Medicare patients treated by Dr. Gareth Davies, MD.

**Gender**
Male	89
Female	85

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	113
Native American / Alaskan Native	0
Hispanic	0
Other	0

**Age**
85 and over	20
75 to 84	56
Less than 65	35
65 to 74	62

Average of Total of Conditions of Medicare patients treated by Dr. Gareth Davies, MD From 2015 - 2021

The highest averages of the most common conditions of Medicare patients that Dr. Gareth Davies, MD treated were hypertension, high cholesterol, depression and ischemic heart disease.

Hypertension	42
High Cholesterol	34
Stroke	10
Ischemic Heart Disease	19
Depression	24
Chronic Kidney Disease	16
Asthma	6
Osteoporosis	4
Heart Failure	10
Chronic Obstructive Pulmonary Disease	10
Diabetes	17
Atrial Fibrillation	8
Dementia	9
Cancer	7

Education & Training

Dr. Gareth Davies, MD graduated from Dartmouth Medical School in 2008. He completed residency at Penn State Hershey Medical Center. He has a state license in Pennsylvania.

Medical School: Dartmouth Medical School (2008)

Residency: Penn State Hershey Medical Center

Licensed In: Pennsylvania

Affiliations & Hospitals

Dr. Gareth Davies, MD is associated with these hospitals and organizations:

Portsmouth Regional Hospital

APPLEDORE MEDICAL GROUP INC

Portsmouth Regional Hospital

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General Payments

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

**Payments by Company**
Stryker Corporation	$201 INTERVENTIONAL SPINE $108	THORACO-LUMBAR $67	NAVIGATION $25
TERUMO MEDICAL CORPORATION	$87 Glidesheath $87
Biomet Microfixation, LLC	$86 MICROFIXATION - PLASTIC RECONSTRUCTION $86
Globus Medical, Inc.	$74 Spine $74
Spineology Inc.	$62 Palisade Pedicle Screw System $36	Spine Devices $27
Other	$356 VNS Therapy $81	Osteocel $42	Deep Brain Neurostimulation $40	GENERAL PAIN MANAGEMENT $38	Senza Spinal Cord Stimulation System $35	Other $120

**Types of Payments**
Food and Beverage	$827
Entertainment	$38

Biography

Dr. Gareth Davies is a neurosurgery specialist in Portsmouth, NH. His clinical interests include concussion, herniated disc, and meningioma. He graduated from Dartmouth Medical School and then he performed his residency at Penn State Hershey Medical Center. Dr. Davies is professionally affiliated with Portsmouth Regional Hospital.

Select Year:

Dr. Gareth Davies, MD

Office Locations

Some issues Dr. Gareth Davies, MD can help you with:

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gareth Davies, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gareth Davies, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gareth Davies, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gareth Davies, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gareth Davies, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gareth Davies, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

Average Medicare Procedure Volume From 2015 - 2021

Average Medicare Patient Data From 2015 - 2021

Average of Total of Conditions of Medicare patients treated by Dr. Gareth Davies, MD From 2015 - 2021

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography

Other Providers in Portsmouth, NH