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Dr. Mark D. Johnson, MD, MD PHD

Accepting New Patients

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Specializes in: Neurosurgery

Harvard Medical School (1995)

Professional interests include: stereotactic radiosurgery (SRS), brain tumor, hydrocephalus

55 LAKE AVENUE NORTH
WORCESTER, MA 01655

(508) 334-3850

Dr. Mark D. Johnson, MD, MD PHD is a neurosurgeon in WORCESTER, MA specializing in neurosurgery. He graduated from Harvard Medical School in 1995 and has 31 years of experience. Dr. Mark D. Johnson, MD, MD PHD is affiliated with Milford Regional Medical Center, UMass Memorial Medical Center and UMass Memorial Health.

Office Locations

55 LAKE AVENUE NORTH
WORCESTER, MA 01655

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Some issues Dr. Mark D. Johnson, MD, MD PHD can help you with:

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.

In The News (see more mentions in the news)

“The forum panelists are: Dr. Eric Dickson, the president and CEO of UMass Memorial Health Care, Dr. Mark Johnson, the chair of UMass Memorial Medical Center's department of neurological surgery,...”—"Watch live, submit questions: UMass Memorial and community leaders answer questions about COVID vaccine", Mass Live, October 2024

“Panelists are: Dr. Eric Dickson, the president and CEO of UMass Memorial Health Care, Dr. Mark Johnson, the chair of UMass Memorial Medical Center's department of neurological surgery, Maggie...”—"Health equity forum from UMass Memorial with MassLive to focus on vaccination program in Central Mass.", Mass Live, October 2024

“When he was attending grade school, Dr. Mark Johnson, now chair of neurosurgery at UMass Memorial Health Care, he was regularly attacked for being a black student in a mostly white school.”—"WBJ Podcast: Dr. Mark Johnson & the fight against racism", Worcester Business Journal, June 2020

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Mark D. Johnson, MD, MD PHD treated as a neurosurgeon in WORCESTER, MA during 2012 were radiation therapy, hospital care, inpatient care and image guided procedures.

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

doctor visit	268
hospital care	20
image guided procedures	20
inpatient care	20
radiation therapy	20

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Mark D. Johnson, MD, MD PHD treated as a neurosurgeon in WORCESTER, MA during 2013 were hospital care, inpatient care, cerebrospinal fluid (CSF) shunt insertion and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

cerebrospinal fluid (CSF) shunt insertion	19
cranial surgery	17
doctor visit	344
excision	17
hospital care	53
image guided procedures	14
inpatient care	53
radiation therapy	14
removal of lesion (e.g. growth)	17

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD.

**Gender**
Male	126
Female	146

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

**Age**
From 65 to 74	89
From 75 to 84	92
85 and over	35
Less than 65	56

Conditions of Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD in 2013

Hypertension	70
High Cholesterol	57
Stroke	18
Ischemic Heart Disease	35
Depression	39
Chronic Kidney Disease	24
Asthma	10
Osteoperosis	11
Atrial Fibrilation	17
Heart Failure	19
Chronic Obstructive Pulmonary Disease	13
Diabetes	24
Dementia	29
Cancer	19

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Mark D. Johnson, MD, MD PHD treated as a neurosurgeon in WORCESTER, MA during 2014 were hospital care, inpatient care, cerebrospinal fluid (CSF) shunt insertion and radiation therapy.

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

cerebrospinal fluid (CSF) shunt insertion	33
doctor visit	429
hospital care	116
image guided procedures	16
inpatient care	116
radiation therapy	16

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD.

**Gender**
Male	126
Female	146

**Ethnicity**
Non-Hispanic White	240
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	90
From 75 to 84	99
85 and over	36
Less than 65	47

Conditions of Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD in 2014

Hypertension	71
High Cholesterol	59
Stroke	19
Ischemic Heart Disease	33
Depression	49
Chronic Kidney Disease	25
Asthma	8
Osteoperosis	13
Atrial Fibrilation	17
Heart Failure	19
Chronic Obstructive Pulmonary Disease	10
Diabetes	29
Dementia	31
Cancer	18

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Mark D. Johnson, MD, MD PHD treated as a neurosurgeon in WORCESTER, MA during 2015 were hospital care, inpatient care, cerebrospinal fluid (CSF) shunt insertion and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

cerebrospinal fluid (CSF) shunt insertion	27
cranial surgery	13
doctor visit	486
excision	13
hospital care	174
image guided procedures	12
inpatient care	174
radiation therapy	12
removal of lesion (e.g. growth)	13

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD.

**Gender**
Male	308
Female	384

**Ethnicity**
Non-Hispanic White	606
Black	0
Hispanic	32
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	246
From 75 to 84	236
85 and over	88
Less than 65	122

Conditions of Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD in 2015

Hypertension	69
High Cholesterol	54
Stroke	23
Ischemic Heart Disease	30
Depression	41
Chronic Kidney Disease	28
Asthma	14
Osteoperosis	12
Atrial Fibrilation	14
Heart Failure	16
Chronic Obstructive Pulmonary Disease	14
Diabetes	27
Dementia	32
Cancer	16

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Mark D. Johnson, MD, MD PHD treated as a neurosurgeon in WORCESTER, MA during 2016 were hospital care, inpatient care and cerebrospinal fluid (CSF) shunt insertion.

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

cerebrospinal fluid (CSF) shunt insertion	28
doctor visit	402
hospital care	159
inpatient care	159

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD.

**Gender**
Male	146
Female	157

**Ethnicity**
Non-Hispanic White	265
Black	0
Hispanic	14
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	87
From 75 to 84	126
85 and over	39
Less than 65	51

Conditions of Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD in 2016

Hypertension	70
High Cholesterol	52
Stroke	19
Ischemic Heart Disease	39
Depression	45
Chronic Kidney Disease	32
Asthma	19
Osteoperosis	12
Atrial Fibrilation	15
Heart Failure	16
Chronic Obstructive Pulmonary Disease	14
Diabetes	29
Dementia	41
Cancer	17

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Mark D. Johnson, MD, MD PHD treated as a neurosurgeon in WORCESTER, MA during 2017 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

doctor visit	235
hospital care	16
inpatient care	16

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD.

**Gender**
Male	84
Female	97

**Ethnicity**
Non-Hispanic White	166
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	60
From 75 to 84	59
85 and over	16
Less than 65	46

Conditions of Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD in 2017

Hypertension	67
High Cholesterol	52
Stroke	15
Ischemic Heart Disease	34
Depression	43
Chronic Kidney Disease	29
Asthma	9
Osteoperosis	10
Atrial Fibrilation	9
Heart Failure	16
Chronic Obstructive Pulmonary Disease	18
Diabetes	25
Dementia	27
Cancer	8

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Mark D. Johnson, MD, MD PHD treated as a neurosurgeon in WORCESTER, MA during 2018 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

doctor visit	232
hospital care	31
inpatient care	31

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD.

**Gender**
Male	73
Female	128

**Ethnicity**
Non-Hispanic White	174
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	75
From 75 to 84	55
85 and over	20
Less than 65	51

Conditions of Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD in 2018

Hypertension	75
High Cholesterol	64
Stroke	18
Ischemic Heart Disease	31
Depression	45
Chronic Kidney Disease	29
Asthma	12
Osteoperosis	8
Atrial Fibrilation	11
Heart Failure	17
Chronic Obstructive Pulmonary Disease	16
Diabetes	27
Dementia	27
Cancer	10

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

doctor visit	176

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD.

**Gender**
Male	50
Female	82

**Ethnicity**
Non-Hispanic White	121
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	46
From 75 to 84	48
85 and over	14
Less than 65	24

Conditions of Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD in 2019

Hypertension	64
High Cholesterol	59
Stroke	14
Ischemic Heart Disease	35
Depression	39
Chronic Kidney Disease	46
Asthma	9
Osteoperosis	13
Atrial Fibrilation	12
Heart Failure	12
Chronic Obstructive Pulmonary Disease	15
Diabetes	30
Dementia	30
Cancer	16

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

doctor visit	147

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD.

**Gender**
Male	44
Female	81

**Age**
From 65 to 74	41
From 75 to 84	47
85 and over	11
Less than 65	26

Conditions of Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD in 2020

Hypertension	66
High Cholesterol	66
Stroke	20
Ischemic Heart Disease	30
Depression	46
Chronic Kidney Disease	36
Asthma	9
Osteoperosis	0
Atrial Fibrilation	10
Heart Failure	18
Chronic Obstructive Pulmonary Disease	13
Diabetes	30
Dementia	32
Cancer	14

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

doctor visit	158

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD.

**Gender**
Male	57
Female	79

**Ethnicity**
Non-Hispanic White	125
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	49
From 75 to 84	50
85 and over	16
Less than 65	21

Conditions of Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD in 2021

Hypertension	71
High Cholesterol	63
Stroke	17
Ischemic Heart Disease	33
Depression	41
Chronic Kidney Disease	44
Asthma	10
Osteoperosis	14
Atrial Fibrilation	13
Heart Failure	17
Chronic Obstructive Pulmonary Disease	10
Diabetes	35
Dementia	25
Cancer	16

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mark D. Johnson, MD, MD PHD treated as a neurosurgeon in WORCESTER, MA during 2022 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

doctor visit	141
hospital care	11
inpatient care	11

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD.

**Gender**
Male	67
Female	79

**Ethnicity**
Non-Hispanic White	132
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	54
From 75 to 84	54
85 and over	19
Less than 65	19

Conditions of Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD in 2022

Hypertension	75
High Cholesterol	75
Stroke	34
Ischemic Heart Disease	31
Depression	44
Chronic Kidney Disease	31
Asthma	11
Osteoperosis	18
Atrial Fibrilation	21
Heart Failure	16
Chronic Obstructive Pulmonary Disease	20
Diabetes	29
Dementia	25
Cancer	21

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Mark D. Johnson, MD, MD PHD for Medicare patients.

The highest averages for the top procedures that Dr. Mark D. Johnson, MD, MD PHD treated as a neurosurgeon in WORCESTER, MA were hospital care, inpatient care, removal of lesion (e.g. growth) and radiation therapy.

cranial surgery	15
doctor visit	274
excision	15
hospital care	72
image guided procedures	15
inpatient care	72
radiation therapy	15
removal of lesion (e.g. growth)	15

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD.

**Gender**
Male	98
Female	125

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	187
Native American / Alaskan Native	0
Hispanic	4
Other	0

**Age**
75 to 84	78
85 and over	26
Less than 65	42
65 to 74	76

Average of Total of Conditions of Medicare patients treated by Dr. Mark D. Johnson, MD, MD PHD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Mark D. Johnson, MD, MD PHD treated were hypertension, high cholesterol, depression and chronic kidney disease.

Hypertension	63
High Cholesterol	54
Stroke	17
Ischemic Heart Disease	30
Depression	39
Chronic Kidney Disease	29
Asthma	10
Osteoporosis	10
Heart Failure	15
Chronic Obstructive Pulmonary Disease	13
Diabetes	25
Atrial Fibrillation	12
Dementia	27
Cancer	14

Education & Training

Dr. Mark D. Johnson, MD, MD PHD graduated from Harvard Medical School in 1995. He completed residency at University of Washington Affiliated Hospitals. He is certified by the American Board of Neurological Surgery and has a state license in Massachusetts.

Medical School: Harvard Medical School (1995)

Residency: University of Washington Affiliated Hospitals

Board Certification: American Board of Neurological Surgery

Licensed In: Massachusetts

Affiliations & Hospitals

Dr. Mark D. Johnson, MD, MD PHD is associated with these hospitals and organizations:

Milford Regional Medical Center

UMass Memorial Medical Center

UMass Memorial Health

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General Payments

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

**Payments by Company**
Janssen Pharmaceuticals, Inc	$31 INVOKANA $19	XARELTO $12
Omeros Corporation	$16 Omidria $16

**Types of Payments**
Food and Beverage	$47

Biography

Dr. Mark Johnson's specialty is neurosurgery. Dr. Johnson's clinical interests include stereotactic radiosurgery (SRS), hydrocephalus, and brain tumor. His hospital/clinic affiliations include UMass Memorial Medical Center and Milford Regional Medical Center. According to Doctor.com, new patients are welcome to contact his office in Worcester, MA. He obtained his medical school training at Harvard Medical School and performed his residency at a hospital affiliated with the University of Washington.