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Dr. Thomas Martin Hemmen, PHD, MD

(Thomas Hemmen, MD, PhD)

(No ratings)

Specializes in: Vascular Surgery, Psychiatry & Neurology, General Practice and Neurology (Brain & Spinal Cord Disease)
Free University of Berlin
Professional interests include: stroke, cerebrovascular disease
9434 Medical Center Drive
San Diego, CA 92037

Dr. Thomas Martin Hemmen, PHD, MD is a vascular surgeon in San Diego, CA specializing in vascular surgery, psychiatry & neurology, general practice and neurology (brain & spinal cord disease). He graduated from Free University of Berlin. Dr. Thomas Martin Hemmen, PHD, MD is affiliated with UC San Diego Health, Regents of the University of California, U.S. Department of Veterans Affairs and UC San Diego Health.

View Doctor's Full Profile (858) 657-8530

Office Locations

9434 Medical Center Drive
San Diego, CA 92037
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11201 Benton Street Va Loma Linda Hcs (605)
Loma Linda, CA 92357
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Some issues Dr. Thomas Martin Hemmen, PHD, MD can help you with:

Stroke

A stroke is a medical emergency that occurs when a blood vessel supplying oxygen and nutrients to the brain is ruptured or blocked. The brain cannot function without a steady supply of oxygen and nutrients, so when the blood supply to the brain is interrupted, even for a brief moment, brain cells begin to die. When a sufficient number of brain cells die, the brain itself can no longer function, meaning that strokes are very dangerous. Strokes can result in impaired movement, speech, cognitive ability, the impairment of important physical functions, and even death.

Anyone can have a stroke, regardless of age and health. Strokes are known to happen at random. However, certain conditions and behaviors can increase one's risk of stroke over time.

Risk factors for stroke include:

  • Heart disease
  • Older age
  • Smoking
  • Diabetes
  • High blood pressure
  • High blood cholesterol and lipids

There are two main types of stroke: ischemic stroke and hemorrhagic stroke. Ischemic stroke occurs more commonly and is when a blood vessel in the brain becomes blocked. Blockages are caused by blood clots and built-up plaque (deposits of fat and cholesterol), which leads to atherosclerosis, a condition where the blood vessels narrow and harden. The resultant restricted blood flow may lead to an ischemic stroke by blocking essential oxygen to the brain, causing the heart to exert more effort to pump blood.

Hemorrhagic stroke occurs when a blood vessel in or around the brain ruptures. The burst vessel leaks blood into surrounding brain tissue, causing irreparable brain damage.

Hemorrhagic strokes are less common and may occur from head injuries, brain aneurysms, brain tumors, and bleeding disorders, amongst other conditions.

Both ischemic and hemorrhagic strokes require immediate medical treatment. Medical intervention can prevent severe and life-threatening brain damage. Signs of stroke include:

-Disorientation or confusion

-Difficulty speaking

-Difficulty walking

-Impaired vision

-Weakness in the face, legs, or arms

-Severe headaches

When someone suspected of having a stroke reaches the hospital, the patient will usually receive a CT or other scan that provides an image of the brain. The scan results can reveal clotted or leaking blood in the brain. Physical exams, neurological exams, and blood tests may also be used to check for blood clotting and sugar. Treatment begins generally immediately if a stroke is detected.

Medical treatment for ischemic strokes includes a thrombolytic medicine which breaks up and disperses blood clots. This medicine can greatly improve stroke recovery and long-term health. However, the thrombolytic medicine must be administered as soon as possible to achieve these results. Other treatments for ischemic strokes are blood thinners and thrombectomy, a surgical procedure to remove a blood clot in the brain. Thrombectomy is performed by inserting a catheter (thin needle) into the artery to reach the blood clot and mechanically remove it. With the clot removed, normal blood flow to the brain resumes. Thrombectomy is typically performed at most six hours after a patient shows signs of a stroke.

Hemorrhagic strokes are treated with blood-saving medication and surgery. For a hemorrhagic stroke caused by the rupture of an aneurysm (blood vessel bulges), surgery to stem the bleeding aneurysm and vessel may be used. One surgical technique is stent-assisted coiling, which adds a stent (small wire-meshed tube) into the blood vessel to block the leaking opening of the aneurysm. A non-surgical procedure is endovascular coiling, where a catheter (thin, hollow needle) places a platinum wire coil at the spot of the aneurysm. The coil blocks bleeding and prevents the aneurysm from continuing to leak blood. These procedures are usually combined with blood-thickening medications. Blood transfusions may be administered if substantial blood loss has occurred.

Since stroke patients may have lost some essential functions while the blood flow to their brains was obstructed, both ischemic stroke and hemorrhage stroke patients may receive post-stroke rehabilitation to rebuild their physical and mental abilities. Some restorative treatments include occupational, physical, and speech therapy. Patients may also receive care from neurologists, who can assist patients in recovering certain brain functions and cognitive abilities, and rehabilitation psychologists, who may help patients with their emotional, behavioral, and cognitive recovery. Some stroke patients require lengthy rehabilitation and may never fully regain function, while others may recover more quickly. While the fastest recovery improvements are usually seen in the first three or four months, stroke rehabilitation can last for years.

If someone begins to show signs of stroke, contact emergency services and call 9-1-1 immediately since blood flow must be restored as soon as possible to help avoid significant brain damage. If an ambulance takes the person to the hospital, paramedics can initiate stroke treatment as soon as the patient enters the ambulance, allowing for more prompt medical intervention and care.

In The News (see more mentions in the news)

“"In order to be recognized for these awards, you must have a team of highly trained emergency department staff, neurologists, radiologists and endovascular surgeons available 24 hours a day, seven...”—"UC San Diego Health Recognized for Life-Saving Stroke Care", Times of San Diego, March 2018
“In the cases of both the boy in Mexico and the New Zealand woman, the hickey might have damaged the blood vessels in the neck, which ultimately might have led to the stroke, said Dr. Thomas Hemmen,...”—"Hickeys? Wasps? Strange things can cause strokes", CBS Philly, September 2016
“Dr. Thomas Hemmen, director of the UCSD Medical Center's stroke program, is co-chair of a committee writing new guidelines that could end up funneling the rarest and most severe stroke cases,...”—"UC San Diego gains coveted stroke-treatment designation", The San Diego Union-Tribune, December 2012

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

doctor visit 198

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 78
Female 76
Ethnicity
Non-Hispanic White 114
Black 0
Hispanic 18
Asian 0
Other 0
Native American 0
Age
From 65 to 74 58
From 75 to 84 48
85 and over 31
Less than 65 17

Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD in 2013

The most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated during 2013 were hypertension, high cholesterol, stroke and ischemic heart disease.

Hypertension 75
High Cholesterol 71
Stroke 68
Ischemic Heart Disease 50
Depression 32
Chronic Kidney Disease 29
Asthma 0
Osteoperosis 12
Atrial Fibrilation 21
Heart Failure 27
Chronic Obstructive Pulmonary Disease 18
Diabetes 30
Dementia 15
Cancer 16

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

doctor visit 151

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 56
Female 62
Ethnicity
Non-Hispanic White 91
Black 0
Hispanic 0
Asian 11
Other 0
Native American 0
Age
From 65 to 74 51
From 75 to 84 38
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD in 2014

The most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated during 2014 were hypertension, stroke, high cholesterol and ischemic heart disease.

Hypertension 75
High Cholesterol 70
Stroke 75
Ischemic Heart Disease 48
Depression 19
Chronic Kidney Disease 25
Asthma 0
Osteoperosis 12
Atrial Fibrilation 28
Heart Failure 22
Chronic Obstructive Pulmonary Disease 0
Diabetes 31
Dementia 19
Cancer 15

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Thomas Martin Hemmen, PHD, MD treated as a vascular surgeon in San Diego, CA during 2015 were hospital care and inpatient care.

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

doctor visit 177
hospital care 140
inpatient care 140

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 200
Female 192
Ethnicity
Non-Hispanic White 246
Black 0
Hispanic 76
Asian 34
Other 0
Native American 0
Age
From 65 to 74 158
From 75 to 84 112
85 and over 66
Less than 65 56

Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD in 2015

The most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated during 2015 were hypertension, high cholesterol, stroke and ischemic heart disease.

Hypertension 75
High Cholesterol 73
Stroke 73
Ischemic Heart Disease 52
Depression 35
Chronic Kidney Disease 39
Asthma 17
Osteoperosis 16
Atrial Fibrilation 25
Heart Failure 30
Chronic Obstructive Pulmonary Disease 20
Diabetes 38
Dementia 18
Cancer 15

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Thomas Martin Hemmen, PHD, MD treated as a vascular surgeon in San Diego, CA during 2016 were hospital care and inpatient care.

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

doctor visit 108
hospital care 167
inpatient care 167

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 114
Female 92
Ethnicity
Non-Hispanic White 135
Black 15
Hispanic 39
Asian 0
Other 0
Native American 0
Age
From 65 to 74 59
From 75 to 84 77
85 and over 44
Less than 65 26

Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD in 2016

The most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated during 2016 were hypertension, stroke, high cholesterol and ischemic heart disease.

Hypertension 75
High Cholesterol 68
Stroke 72
Ischemic Heart Disease 58
Depression 40
Chronic Kidney Disease 50
Asthma 21
Osteoperosis 12
Atrial Fibrilation 30
Heart Failure 45
Chronic Obstructive Pulmonary Disease 21
Diabetes 37
Dementia 32
Cancer 17

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Thomas Martin Hemmen, PHD, MD treated as a vascular surgeon in San Diego, CA during 2017 were hospital care and inpatient care.

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

doctor visit 69
hospital care 176
inpatient care 176

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 114
Female 86
Ethnicity
Non-Hispanic White 133
Black 15
Hispanic 35
Asian 0
Other 0
Native American 0
Age
From 65 to 74 78
From 75 to 84 67
85 and over 33
Less than 65 22

Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD in 2017

The most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated during 2017 were hypertension, stroke, high cholesterol and ischemic heart disease.

Hypertension 75
High Cholesterol 67
Stroke 72
Ischemic Heart Disease 56
Depression 42
Chronic Kidney Disease 51
Asthma 14
Osteoperosis 12
Atrial Fibrilation 24
Heart Failure 44
Chronic Obstructive Pulmonary Disease 20
Diabetes 41
Dementia 34
Cancer 16

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Thomas Martin Hemmen, PHD, MD treated as a vascular surgeon in San Diego, CA during 2018 were hospital care and inpatient care.

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

doctor visit 81
hospital care 153
inpatient care 153

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 88
Female 87
Ethnicity
Non-Hispanic White 110
Black 0
Hispanic 33
Asian 15
Other 0
Native American 0
Age
From 65 to 74 52
From 75 to 84 75
85 and over 26
Less than 65 22

Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD in 2018

The most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated during 2018 were high cholesterol, hypertension, stroke and ischemic heart disease.

Hypertension 75
High Cholesterol 75
Stroke 75
Ischemic Heart Disease 61
Depression 42
Chronic Kidney Disease 47
Asthma 0
Osteoperosis 17
Atrial Fibrilation 31
Heart Failure 41
Chronic Obstructive Pulmonary Disease 21
Diabetes 41
Dementia 29
Cancer 17

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Thomas Martin Hemmen, PHD, MD treated as a vascular surgeon in San Diego, CA during 2019 were hospital care and inpatient care.

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

doctor visit 114
hospital care 180
inpatient care 180

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 114
Female 94
Ethnicity
Non-Hispanic White 124
Black 0
Hispanic 46
Asian 15
Other 0
Native American 0
Age
From 65 to 74 81
From 75 to 84 70
85 and over 42
Less than 65 15

Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD in 2019

The most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated during 2019 were high cholesterol, hypertension, stroke and ischemic heart disease.

Hypertension 75
High Cholesterol 75
Stroke 74
Ischemic Heart Disease 64
Depression 39
Chronic Kidney Disease 55
Asthma 10
Osteoperosis 18
Atrial Fibrilation 30
Heart Failure 43
Chronic Obstructive Pulmonary Disease 15
Diabetes 39
Dementia 30
Cancer 16

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Thomas Martin Hemmen, PHD, MD treated as a vascular surgeon in San Diego, CA during 2020 were hospital care and inpatient care.

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

doctor visit 88
hospital care 155
inpatient care 155

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 123
Female 102
Ethnicity
Non-Hispanic White 148
Black 0
Hispanic 41
Asian 22
Other 0
Native American 0
Age
From 65 to 74 78
From 75 to 84 91
85 and over 30
Less than 65 26

Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD in 2020

The most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated during 2020 were high cholesterol, hypertension, stroke and ischemic heart disease.

Hypertension 75
High Cholesterol 75
Stroke 75
Ischemic Heart Disease 59
Depression 35
Chronic Kidney Disease 57
Asthma 11
Osteoperosis 15
Atrial Fibrilation 27
Heart Failure 38
Chronic Obstructive Pulmonary Disease 18
Diabetes 41
Dementia 28
Cancer 16

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Thomas Martin Hemmen, PHD, MD treated as a vascular surgeon in San Diego, CA during 2021 were hospital care and inpatient care.

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

doctor visit 105
hospital care 210
inpatient care 210

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 137
Female 136
Ethnicity
Non-Hispanic White 175
Black 0
Hispanic 56
Asian 18
Other 0
Native American 0
Age
From 65 to 74 111
From 75 to 84 92
85 and over 45
Less than 65 25

Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD in 2021

The most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated during 2021 were high cholesterol, hypertension, stroke and ischemic heart disease.

Hypertension 75
High Cholesterol 75
Stroke 75
Ischemic Heart Disease 57
Depression 38
Chronic Kidney Disease 53
Asthma 9
Osteoperosis 14
Atrial Fibrilation 26
Heart Failure 40
Chronic Obstructive Pulmonary Disease 15
Diabetes 47
Dementia 39
Cancer 20

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Thomas Martin Hemmen, PHD, MD treated as a vascular surgeon in San Diego, CA during 2022 were hospital care and inpatient care.

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

doctor visit 42
hospital care 176
inpatient care 176

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 114
Female 106
Ethnicity
Non-Hispanic White 141
Black 0
Hispanic 37
Asian 20
Other 0
Native American 0
Age
From 65 to 74 70
From 75 to 84 81
85 and over 41
Less than 65 28

Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD in 2022

The most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated during 2022 were high cholesterol, hypertension, stroke and ischemic heart disease.

Hypertension 75
High Cholesterol 75
Stroke 75
Ischemic Heart Disease 47
Depression 40
Chronic Kidney Disease 40
Asthma 14
Osteoperosis 19
Atrial Fibrilation 35
Heart Failure 36
Chronic Obstructive Pulmonary Disease 22
Diabetes 41
Dementia 25
Cancer 22

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Thomas Martin Hemmen, PHD, MD treated as a vascular surgeon in San Diego, CA during 2023 were hospital care and inpatient care.

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

doctor visit 58
hospital care 191
inpatient care 191

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 112
Female 108
Ethnicity
Non-Hispanic White 140
Black 17
Hispanic 37
Asian 11
Other 15
Native American 0
Age
From 65 to 74 67
From 75 to 84 89
85 and over 43
Less than 65 21

Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD in 2023

The most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated during 2023 were high cholesterol, hypertension, stroke and diabetes.

Hypertension 75
High Cholesterol 75
Stroke 75
Ischemic Heart Disease 41
Depression 39
Chronic Kidney Disease 37
Asthma 17
Osteoperosis 22
Atrial Fibrilation 35
Heart Failure 34
Chronic Obstructive Pulmonary Disease 21
Diabetes 41
Dementia 27
Cancer 19

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2013 - 2023

Volume of procedures performed by Dr. Thomas Martin Hemmen, PHD, MD for Medicare patients.

The highest averages for the top procedures that Dr. Thomas Martin Hemmen, PHD, MD treated as a vascular surgeon in San Diego, CA were hospital care and inpatient care.

doctor visit 108
hospital care 172
inpatient care 172

Average Medicare Patient Data From 2013 - 2023

Information about Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD.

Gender
Male 113
Female 103
Ethnicity
Black / African American 4
Asian / Pacific Islander 13
Non-Hispanic White 141
Native American / Alaskan Native 0
Hispanic 38
Other 1
Age
75 to 84 76
85 and over 36
Less than 65 23
65 to 74 78

Average of Total of Conditions of Medicare patients treated by Dr. Thomas Martin Hemmen, PHD, MD From 2013 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. Thomas Martin Hemmen, PHD, MD treated were hypertension, stroke, high cholesterol and ischemic heart disease.

Hypertension 75
High Cholesterol 72
Stroke 73
Ischemic Heart Disease 53
Depression 36
Chronic Kidney Disease 43
Asthma 10
Osteoporosis 15
Heart Failure 36
Chronic Obstructive Pulmonary Disease 17
Diabetes 38
Atrial Fibrillation 28
Cancer 17
Dementia 26

Education & Training

Dr. Thomas Martin Hemmen, PHD, MD graduated from Free University of Berlin. He is certified by the NeurologyVascular Neurology and has a state license in California.

Medical School: Free University of Berlin

Board Certification: NeurologyVascular Neurology

Licensed In: California

Affiliations & Hospitals

Dr. Thomas Martin Hemmen, PHD, MD is associated with these hospitals and organizations:

UC San Diego Health
Regents of the University of California
U.S. Department of Veterans Affairs
UC San Diego Health

Ratings & Reviews

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General Payments

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

Payments by Company
Merck Sharp & Dohme Corporation $27,938 JANUVIA
$16,350 		MK-3102
$4,662 		MK-3222
$3,525 		MK0859
$2,450 		ILUMYA
$575 		Other
$375
C. R. Bard, Inc. & Subsidiaries $3,340 Urology
$3,340
The Medicines Company $198 RECOTHROM
$198
ZOLL Medical Corporation $190 DEFIBRILLATOR
$190
Covidien LP $119 Neurovascular Stents
$119
Other $388 VIZ.AI LVO
$105 		(7999) SRC Undivided
$90 		Activase
$35 		XARELTO
$20 		Pradaxa
$11 		Other
$128
Types of Payments
Consulting Fee $31,138
Food and Beverage $412
Education $198
Entertainment $190
Travel and Lodging $140
Other $95

Research Payments

Dr. Thomas Martin Hemmen, PHD, MD has received 108 research payments totaling $215,539.

Biography

Dr. Thomas Hemmen's medical specialty is vascular neurology. He is especially interested in stroke. Dr. Hemmen is affiliated with UC San Diego Health, Regents of the University of California, and U.S. Department of Veterans Affairs. He studied medicine at Free University of Berlin.

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