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Home > AZ Providers > Family Physicians & Family Medicine Specialists

Dr. John Duncan Marshall, MD

(Dr. John D. Marshall, MD)

(33 Ratings)

Specializes in: Family Medicine and General Practice

3811 E Bell Road Suite 106
Phoenix, AZ 85032

(602) 482-6100

Dr. John Duncan Marshall, MD is a family medicine practitioner in Phoenix, AZ specializing in family medicine and general practice.

Office Locations

3811 E Bell Road Suite 106
Phoenix, AZ 85032

(602) 482-6100

(602) 992-6424

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Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2012 were lab tests, thyroid function tests, preventive care and blood draw.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	1356
cardiac procedures	37
diabetes management	309
doctor visit	2239
ear procedures	21
hip imaging	21
lab tests	6871
manual therapy	780
musculoskeletal imaging	82
preventive care	1550
rehabilitation	251
removal of lesion (e.g. growth)	20
skin procedures	20
spinal procedures	55
thoracic (chest) imaging	160
thyroid function tests	2189
ultrasound (sonogram)	38
vaccines	186
vascular procedures	25
X-rays	297

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2013 were lab tests, thyroid function tests, preventive care and blood draw.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	1393
cardiac procedures	48
diabetes management	322
doctor visit	2415
ear procedures	34
lab tests	7095
manual therapy	797
musculoskeletal imaging	43
preventive care	1572
rehabilitation	177
removal of lesion (e.g. growth)	29
skin procedures	29
spinal procedures	23
thoracic (chest) imaging	187
thyroid function tests	2106
ultrasound (sonogram)	37
vaccines	198
vascular procedures	21
X-rays	253

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	272
Female	338

**Ethnicity**
Non-Hispanic White	577
Black	0
Hispanic	15
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	332
From 75 to 84	189
85 and over	49
Less than 65	40

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2013

Hypertension	50
High Cholesterol	73
Stroke	4
Ischemic Heart Disease	21
Depression	6
Chronic Kidney Disease	14
Asthma	3
Osteoperosis	3
Atrial Fibrilation	8
Heart Failure	6
Chronic Obstructive Pulmonary Disease	6
Diabetes	19
Dementia	4
Cancer	7

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2014 were lab tests, thyroid function tests, preventive care and blood draw.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	947
cardiac procedures	29
diabetes management	184
doctor visit	1840
ear procedures	32
lab tests	4807
manual therapy	709
musculoskeletal imaging	12
preventive care	1099
rehabilitation	70
removal of lesion (e.g. growth)	27
skin procedures	27
spinal procedures	16
thoracic (chest) imaging	152
thyroid function tests	1342
ultrasound (sonogram)	36
vaccines	244
vascular procedures	67
X-rays	180

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	251
Female	310

**Ethnicity**
Non-Hispanic White	530
Black	0
Hispanic	12
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	318
From 75 to 84	169
85 and over	42
Less than 65	32

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2014

Hypertension	52
High Cholesterol	73
Stroke	3
Ischemic Heart Disease	22
Depression	6
Chronic Kidney Disease	14
Asthma	4
Osteoperosis	4
Atrial Fibrilation	7
Heart Failure	6
Chronic Obstructive Pulmonary Disease	7
Diabetes	19
Dementia	4
Cancer	7

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2015 were lab tests, preventive care, blood draw and thyroid function tests.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	950
breast exam	11
cardiac procedures	29
diabetes management	240
doctor visit	1985
ear procedures	36
gynecologic procedures	11
lab tests	4316
manual therapy	629
preventive care	1192
rehabilitation	84
removal of lesion (e.g. growth)	35
skin procedures	35
thoracic (chest) imaging	170
thyroid function tests	918
ultrasound (sonogram)	32
vaccines	241
vascular procedures	15
X-rays	170

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	568
Female	690

**Ethnicity**
Non-Hispanic White	1182
Black	0
Hispanic	32
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	718
From 75 to 84	350
85 and over	114
Less than 65	76

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2015

Hypertension	59
High Cholesterol	65
Stroke	3
Ischemic Heart Disease	26
Depression	8
Chronic Kidney Disease	15
Asthma	8
Osteoperosis	4
Atrial Fibrilation	8
Heart Failure	7
Chronic Obstructive Pulmonary Disease	6
Diabetes	21
Dementia	5
Cancer	8

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2016 were lab tests, preventive care, blood draw and manual therapy.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	628
breast exam	22
cardiac procedures	13
cytology	18
diabetes management	139
doctor visit	1201
ear procedures	14
gynecologic pathology	18
gynecologic procedures	22
lab tests	2269
manual therapy	286
preventive care	790
thoracic (chest) imaging	55
thyroid function tests	256
vaccines	222
X-rays	55

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	196
Female	255

**Ethnicity**
Non-Hispanic White	424
Black	0
Hispanic	11
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	267
From 75 to 84	123
85 and over	38
Less than 65	23

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2016

Hypertension	57
High Cholesterol	67
Stroke	3
Ischemic Heart Disease	26
Depression	10
Chronic Kidney Disease	22
Asthma	12
Osteoperosis	4
Atrial Fibrilation	8
Heart Failure	8
Chronic Obstructive Pulmonary Disease	8
Diabetes	18
Dementia	4
Cancer	7

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2017 were preventive care, vaccines, lab tests and blood draw.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	14
doctor visit	1070
lab tests	178
preventive care	214
vaccines	214

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	178
Female	243

**Ethnicity**
Non-Hispanic White	398
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	231
From 75 to 84	126
85 and over	41
Less than 65	23

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2017

Hypertension	58
High Cholesterol	59
Stroke	0
Ischemic Heart Disease	22
Depression	13
Chronic Kidney Disease	24
Asthma	7
Osteoperosis	5
Atrial Fibrilation	8
Heart Failure	9
Chronic Obstructive Pulmonary Disease	10
Diabetes	20
Dementia	5
Cancer	7

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2018 were blood draw, lab tests, preventive care and vaccines.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	148
doctor visit	693
lab tests	132
preventive care	67
removal of lesion (e.g. growth)	14
skin procedures	14
vaccines	67

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	84
Female	133

**Age**
From 65 to 74	115
From 75 to 84	73
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2018

Hypertension	55
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	22
Depression	18
Chronic Kidney Disease	23
Asthma	5
Osteoperosis	6
Atrial Fibrilation	10
Heart Failure	7
Chronic Obstructive Pulmonary Disease	9
Diabetes	18
Dementia	8
Cancer	8

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2019 were blood draw and lab tests.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	247
doctor visit	577
lab tests	139

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	65
Female	71

**Age**
From 65 to 74	70
From 75 to 84	47
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2019

Hypertension	52
High Cholesterol	61
Stroke	0
Ischemic Heart Disease	23
Depression	16
Chronic Kidney Disease	18
Asthma	0
Osteoperosis	0
Atrial Fibrilation	11
Heart Failure	10
Chronic Obstructive Pulmonary Disease	0
Diabetes	10
Dementia	0
Cancer	13

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2020 were blood draw and lab tests.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	159
doctor visit	487
lab tests	98

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	58
Female	62

**Age**
From 65 to 74	61
From 75 to 84	41
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2020

Hypertension	56
High Cholesterol	51
Stroke	0
Ischemic Heart Disease	25
Depression	17
Chronic Kidney Disease	18
Asthma	0
Osteoperosis	0
Atrial Fibrilation	9
Heart Failure	13
Chronic Obstructive Pulmonary Disease	10
Diabetes	0
Dementia	0
Cancer	11

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2021 were blood draw, lab tests and cardiac procedures.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	153
cardiac procedures	34
doctor visit	593
lab tests	102

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	53
Female	62

**Age**
From 65 to 74	56
From 75 to 84	42
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2021

Hypertension	52
High Cholesterol	65
Stroke	0
Ischemic Heart Disease	23
Depression	0
Chronic Kidney Disease	22
Asthma	0
Osteoperosis	0
Atrial Fibrilation	10
Heart Failure	15
Chronic Obstructive Pulmonary Disease	0
Diabetes	10
Dementia	0
Cancer	11

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2022 were blood draw, lab tests and cardiac procedures.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	152
cardiac procedures	36
doctor visit	732
lab tests	109

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	58
Female	63

**Age**
From 65 to 74	55
From 75 to 84	48
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2022

Hypertension	63
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	12
Depression	10
Chronic Kidney Disease	12
Asthma	0
Osteoperosis	0
Atrial Fibrilation	11
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	9
Dementia	0
Cancer	14

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2023 were blood draw and lab tests.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	138
doctor visit	793
lab tests	98

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	57
Female	63

**Age**
From 65 to 74	55
From 75 to 84	49
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2023

Hypertension	68
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	20
Depression	0
Chronic Kidney Disease	14
Asthma	0
Osteoperosis	0
Atrial Fibrilation	13
Heart Failure	9
Chronic Obstructive Pulmonary Disease	10
Diabetes	9
Dementia	0
Cancer	16

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ during 2024 were blood draw and lab tests.

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

blood draw	36
doctor visit	156
lab tests	28

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Male	43
Female	43

**Age**
From 65 to 74	37
From 75 to 84	34
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2024

Hypertension	66
High Cholesterol	75
Stroke	14
Ischemic Heart Disease	29
Depression	0
Chronic Kidney Disease	23
Asthma	0
Osteoperosis	0
Atrial Fibrilation	19
Heart Failure	0
Chronic Obstructive Pulmonary Disease	13
Diabetes	23
Dementia	0
Cancer	19

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. John Duncan Marshall, MD for Medicare patients.

The highest averages for the top procedures that Dr. John Duncan Marshall, MD treated as a family medicine practitioner in Phoenix, AZ were lab tests, thyroid function tests, preventive care and manual therapy.

blood draw	486
breast exam	16
cardiac procedures	32
cytology	18
diabetes management	238
doctor visit	1137
ear procedures	27
gynecologic pathology	18
gynecologic procedures	16
hip imaging	21
lab tests	2018
manual therapy	640
musculoskeletal imaging	45
preventive care	926
rehabilitation	145
removal of lesion (e.g. growth)	25
skin procedures	25
spinal procedures	31
thoracic (chest) imaging	144
thyroid function tests	1362
ultrasound (sonogram)	35
vaccines	196
vascular procedures	32
X-rays	191

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. John Duncan Marshall, MD.

**Gender**
Female	179
Male	144

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	239
Hispanic	5
Native American / Alaskan Native	0
Other	0

**Age**
85 and over	21
75 to 84	99
Less than 65	14
65 to 74	178

Average of Total of Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD From 2012 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. John Duncan Marshall, MD treated were high cholesterol, hypertension, ischemic heart disease and chronic kidney disease.

Hypertension	52
High Cholesterol	61
Stroke	2
Ischemic Heart Disease	20
Depression	8
Chronic Kidney Disease	16
Asthma	3
Osteoporosis	2
Heart Failure	6
Chronic Obstructive Pulmonary Disease	6
Diabetes	13
Atrial Fibrillation	9
Cancer	9
Dementia	2

Education & Training

He has a state license in Arizona.

Licensed In: Arizona

Ratings & Reviews

Dr. John Duncan Marshall, MD has a high overall rating with an average of 3.8 out of 5 stars based on 33 ratings. We collect ratings and reviews of Dr. John Duncan Marshall, MD from all over the web to help you find the right in Phoenix, AZ.

3.8

Overall Rating

(33 Ratings)

Leave a Review

Reviews Left On DocSpot

Overall Rating: 5.0 2023-11-02

Dr. Marshall has been my Primary Care Physician for over 8 years now. The care and kindness he & his staff provides is unbelievably high. He takes more time than any other PCP or specialist that I have seen, EVER. He truly cares about his patients & their families in a way that makes you feel like family. I would recommend him in a heart beat to anyone I come across.

General Payments

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

**Payments by Company**
Boston Scientific Corporation	$682 Angiojet $514	WALLSTENT $104	GENERAL - ATHERECTOMY $34	PAIN MANAGEMENT $15	Varithena Administration Pack $15
AstraZeneca Pharmaceuticals LP	$221 FARXIGA $112	BYDUREON $31	SYMBICORT $26	MOVANTIK $24	BYDUREON PEN $14	Other $14
Purdue Pharma L.P.	$180 HYSINGLA ER $121	BUTRANS $25	OXYCONTIN $23	$12
Takeda Pharmaceuticals America, Inc.	$158 Trintellix $53	Brintellix $47	Contrave $19	Colcrys $13	Kazano $13	Other $13
Daiichi Sankyo Inc.	$157 Welchol $102	MOVANTIK $35	Benicar $19
Other	$1,473 SUBSYS $126	INVOKANA $107	VYVANSE $70	TOUJEO $68	LINZESS $65	Other $1,036

**Types of Payments**
Food and Beverage	$2,870

Biography

Dr. John Marshall's specialties are general practice and family medicine. He practices in Phoenix, AZ. Dr. Marshall has received a 4.0 out of 5 star rating by his patients.

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Dr. John Duncan Marshall, MD

Office Locations

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 Duncan Marshall, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2022

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

2023 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2023

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

2024 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD in 2024

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Average Medicare Patient Data From 2012 - 2024

Average of Total of Conditions of Medicare patients treated by Dr. John Duncan Marshall, MD From 2012 - 2024

Education & Training

Ratings & Reviews

General Payments

Biography

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