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Home > AZ Providers > Radiation Oncologists

Dr. Jonathan B. Ashman, PhD, MD

(Jonathan Ashman, M.D.)

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Specializes in: Radiation Oncology and Nuclear Medicine

University of Chicago, Pritzker School of Medicine (2001)

Professional interests include: anal cancer, neuroendocrine tumors, pituitary tumor, and more.

5779 E. Mayo Boulevard
Phoenix, AZ 85054

(480) 342-2000

Dr. Jonathan B. Ashman, PhD, MD is a radiation oncologist in Phoenix, AZ specializing in radiation oncology and nuclear medicine. He graduated from University of Chicago, Pritzker School of Medicine in 2001 and has 25 years of experience. Dr. Jonathan B. Ashman, PhD, MD is affiliated with Mayo Clinic.

Office Locations

5779 E. Mayo Boulevard
Phoenix, AZ 85054

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Phoenix, AZ

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Some issues Dr. Jonathan B. Ashman, PhD, MD can help you with:

Gastrointestinal Problems (Digestive Disorders)

The gastrointestinal system, or GI tract, is the name given to a collection of organs that work together to digest food. These organs fit together in a long tube, running from the mouth to the anus, and include the esophagus, stomach, and intestines, among others. With so many parts working together, complicated by today's busy lifestyles and diets, digestive problems are common. As many as 1 in 3 Americans have a digestive or GI disorder. There are a huge variety of digestive problems, but the most common are IBS, constipation, GERD, hemorrhoids, and ulcers.

IBS, or irritable bowel syndrome, happens when the muscles surrounding the colon contract too easily or frequently. The result is abdominal pain, cramps, diarrhea or constipation, gas and bloating. IBS attacks can often be brought on by specific triggers, so a key part of treatment is learning which foods trigger IBS attacks and avoiding them. Treatment also includes exercise, avoiding stress, and medications if needed.

Constipation, or large, hard, or infrequent stools, happens to everyone at some point. It can be caused by a disruption in routine or food, or by eating a diet without many fresh fruits and vegetables. Although it is uncomfortable, constipation is common and usually not serious, but it can sometimes become chronic. Adding fiber to the diet, exercising, and taking medications may help.

GERD, or gastroesophageal reflux disease, is a severe form of chronic heartburn where stomach acid spills back up into the esophagus. Left untreated, the acid may even eat away at the esophagus and cause serious damage. Treatment includes changing the diet to avoid trigger foods, losing weight if needed, medications, or even surgery.

Hemorrhoids are blood vessels around the rectum that become irritated, swollen or torn while straining during a bowel movement. They are most often caused by constipation, but can also be caused by pregnancy, diarrhea, or simply a genetic predisposition towards hemorrhoids. Treatment involves first treating any constipation issues, then keeping the area clean and soothed until it has healed. If these measures are ineffective, surgery is sometimes used.

Peptic ulcers are sores or spots of inflammation in the lining of the stomach or close to the stomach in the small intestine. Usually this area is coated with a protective lining that shields the tissue from the strong stomach acid, but a break in the lining can let acid in, causing the sores. It used to be thought that stress caused ulcers, but now it is known that is not the case. Most often, they are caused by an infection by H. pylori bacteria, but ulcers can also be caused by alcohol abuse or overuse of aspirin, ibuprofen, naproxen, or other NSAIDS. The symptoms of an ulcer are pain, hunger, nausea, and fatigue.

Gastrointestinal problems, perhaps more than any other area, are markedly affected by lifestyle. Many disorders can be prevented or treated at least in part by eating a healthy diet high in fiber, exercising regularly, drinking enough water, and limiting alcohol intake. Still, the frequency of digestive disorders means that even the healthiest person can be affected by them. Anyone who notices blood in their stool, experiences abdominal pain, unexplained weight loss, or any significant change in bowel movements should see a doctor.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ during 2012 were radiation therapy and image guided procedures.

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

doctor visit	422
image guided procedures	76
radiation therapy	1328

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ during 2013 were radiation therapy and image guided procedures.

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

doctor visit	438
image guided procedures	45
radiation therapy	1100

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD.

**Gender**
Male	122
Female	102

**Ethnicity**
Non-Hispanic White	210
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	109
From 75 to 84	76
85 and over	25
Less than 65	14

Conditions of Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD in 2013

Hypertension	63
High Cholesterol	50
Stroke	0
Ischemic Heart Disease	41
Depression	19
Chronic Kidney Disease	25
Asthma	8
Osteoperosis	7
Atrial Fibrilation	14
Heart Failure	17
Chronic Obstructive Pulmonary Disease	18
Diabetes	24
Dementia	5
Cancer	51

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ during 2014 were radiation therapy.

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

doctor visit	397
radiation therapy	411

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD.

**Gender**
Male	112
Female	70

**Age**
From 65 to 74	75
From 75 to 84	73
85 and over	21
Less than 65	13

Conditions of Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD in 2014

Hypertension	64
High Cholesterol	50
Stroke	0
Ischemic Heart Disease	40
Depression	18
Chronic Kidney Disease	28
Asthma	6
Osteoperosis	8
Atrial Fibrilation	14
Heart Failure	15
Chronic Obstructive Pulmonary Disease	21
Diabetes	18
Dementia	0
Cancer	62

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ during 2015 were radiation therapy.

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

doctor visit	345
radiation therapy	189

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD.

**Gender**
Male	210
Female	146

**Ethnicity**
Non-Hispanic White	326
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	152
From 75 to 84	136
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD in 2015

Hypertension	67
High Cholesterol	45
Stroke	8
Ischemic Heart Disease	46
Depression	20
Chronic Kidney Disease	37
Asthma	10
Osteoperosis	10
Atrial Fibrilation	18
Heart Failure	16
Chronic Obstructive Pulmonary Disease	18
Diabetes	31
Dementia	0
Cancer	48

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ during 2016 were radiation therapy.

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

doctor visit	362
radiation therapy	52

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD.

**Gender**
Male	104
Female	66

**Ethnicity**
Non-Hispanic White	150
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	76
From 75 to 84	59
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD in 2016

Hypertension	61
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	38
Depression	25
Chronic Kidney Disease	42
Asthma	15
Osteoperosis	9
Atrial Fibrilation	12
Heart Failure	16
Chronic Obstructive Pulmonary Disease	13
Diabetes	25
Dementia	8
Cancer	47

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ during 2017 were radiation therapy.

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

doctor visit	332
radiation therapy	45

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD.

**Gender**
Male	111
Female	67

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

**Age**
From 65 to 74	73
From 75 to 84	75
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD in 2017

Hypertension	63
High Cholesterol	56
Stroke	0
Ischemic Heart Disease	47
Depression	19
Chronic Kidney Disease	39
Asthma	0
Osteoperosis	8
Atrial Fibrilation	19
Heart Failure	21
Chronic Obstructive Pulmonary Disease	13
Diabetes	24
Dementia	8
Cancer	42

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ during 2018 were radiation therapy.

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

doctor visit	346
radiation therapy	54

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD.

**Gender**
Male	110
Female	87

**Ethnicity**
Non-Hispanic White	173
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	100
From 75 to 84	71
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD in 2018

Hypertension	62
High Cholesterol	59
Stroke	0
Ischemic Heart Disease	43
Depression	21
Chronic Kidney Disease	37
Asthma	8
Osteoperosis	8
Atrial Fibrilation	12
Heart Failure	16
Chronic Obstructive Pulmonary Disease	18
Diabetes	20
Dementia	7
Cancer	36

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ during 2019 were radiation therapy.

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

doctor visit	375
radiation therapy	65

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD.

**Gender**
Male	113
Female	89

**Ethnicity**
Non-Hispanic White	175
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	108
From 75 to 84	60
85 and over	21
Less than 65	13

Conditions of Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD in 2019

Hypertension	64
High Cholesterol	56
Stroke	7
Ischemic Heart Disease	39
Depression	24
Chronic Kidney Disease	36
Asthma	8
Osteoperosis	10
Atrial Fibrilation	13
Heart Failure	19
Chronic Obstructive Pulmonary Disease	12
Diabetes	26
Dementia	7
Cancer	36

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ during 2020 were radiation therapy.

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

doctor visit	308
radiation therapy	15

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD.

**Gender**
Male	118
Female	80

**Ethnicity**
Non-Hispanic White	171
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	106
From 75 to 84	66
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD in 2020

Hypertension	57
High Cholesterol	51
Stroke	0
Ischemic Heart Disease	32
Depression	20
Chronic Kidney Disease	37
Asthma	8
Osteoperosis	8
Atrial Fibrilation	16
Heart Failure	14
Chronic Obstructive Pulmonary Disease	15
Diabetes	23
Dementia	6
Cancer	37

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ during 2021 were radiation therapy.

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

doctor visit	306
radiation therapy	13

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD.

**Gender**
Male	114
Female	89

**Ethnicity**
Non-Hispanic White	175
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	112
From 75 to 84	69
85 and over	11
Less than 65	11

Conditions of Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD in 2021

Hypertension	57
High Cholesterol	51
Stroke	6
Ischemic Heart Disease	33
Depression	22
Chronic Kidney Disease	35
Asthma	6
Osteoperosis	9
Atrial Fibrilation	16
Heart Failure	16
Chronic Obstructive Pulmonary Disease	7
Diabetes	21
Dementia	6
Cancer	37

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ during 2022 were radiation therapy.

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

doctor visit	402
radiation therapy	13

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD.

**Gender**
Male	111
Female	107

**Ethnicity**
Non-Hispanic White	194
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	109
From 75 to 84	82
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD in 2022

Hypertension	68
High Cholesterol	64
Stroke	14
Ischemic Heart Disease	21
Depression	18
Chronic Kidney Disease	23
Asthma	8
Osteoperosis	17
Atrial Fibrilation	22
Heart Failure	11
Chronic Obstructive Pulmonary Disease	15
Diabetes	24
Dementia	0
Cancer	47

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Jonathan B. Ashman, PhD, MD for Medicare patients.

The highest averages for the top procedures that Dr. Jonathan B. Ashman, PhD, MD treated as a radiation oncologist in Phoenix, AZ were radiation therapy and image guided procedures.

doctor visit	366
image guided procedures	60
radiation therapy	298

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD.

**Gender**
Male	111
Female	82

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	157
Native American / Alaskan Native	0
Hispanic	0
Other	0

**Age**
75 to 84	69
85 and over	7
Less than 65	4
65 to 74	92

Average of Total of Conditions of Medicare patients treated by Dr. Jonathan B. Ashman, PhD, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Jonathan B. Ashman, PhD, MD treated were hypertension, high cholesterol, cancer and ischemic heart disease.

Hypertension	56
High Cholesterol	48
Stroke	3
Ischemic Heart Disease	34
Depression	18
Chronic Kidney Disease	30
Asthma	7
Osteoporosis	8
Heart Failure	14
Chronic Obstructive Pulmonary Disease	13
Diabetes	21
Atrial Fibrillation	14
Dementia	4
Cancer	40

Education & Training

Dr. Jonathan B. Ashman, PhD, MD graduated from University of Chicago, Pritzker School of Medicine in 2001. He completed residency at Memorial Sloan-Kettering Cancer Center. He is certified by the Radiation Oncology American Board of Radiology and has a state license in Arizona.

Medical School: University of Chicago, Pritzker School of Medicine (2001)

Residency: Memorial Sloan-Kettering Cancer Center (2006)

Board Certification: Radiation Oncology American Board of Radiology (2007)

Licensed In: Arizona

Affiliations & Hospitals

Dr. Jonathan B. Ashman, PhD, MD is associated with these hospitals and organizations:

Mayo Clinic

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Biography

Dr. Jonathan Ashman is a specialist in radiation oncology and nuclear medicine. He is a graduate of the University of Chicago, Pritzker School of Medicine. For his residency, Dr. Ashman trained at Memorial Sloan-Kettering Cancer Center. Areas of expertise for Dr. Ashman include colon cancer, acoustic neuroma, and glioblastoma. Dr. Ashman has received professional recognition including the following: Fellow - American Society for Radiation Oncology (ASTRO); Program Director of the Year - Mayo Clinic School of Graduate Medical Education; and Patient Experience - Top Performing Clinician Award - Mayo Clinic in Arizona. He is professionally affiliated with Mayo Clinic.