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Home > TX Providers > Cytopathologists

Dr. John M. Stewart, PHD, MD

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Specializes in: Cytopathology

University of Virginia School of Medicine (1993)

1515 Holcombe Boulevard
Houston, TX 77030

(713) 792-6161

Dr. John M. Stewart, PHD, MD is a cytopathologist in Houston, TX specializing in cytopathology. He graduated from University of Virginia School of Medicine in 1993 and has 33 years of experience. Dr. John M. Stewart, PHD, MD is affiliated with The University of Texas MD Anderson Cancer Center.

Office Locations

1515 Holcombe Boulevard
Houston, TX 77030

(713) 792-6161

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Noteworthy Medicare Patient Procedures Performed by Dr. John M. Stewart, PHD, MD in 2023

Click on any procedure below to see further details on volume and pricing among Medicare patients.

Top 5%

By Volume:

concentrated smear of non-gynecologic specimen

In 2023, Dr. John M. Stewart, PHD, MD performed more concentrated smear (cytospin) of non-gynecologic specimen procedures for Medicare patients than 95% of providers in related specialties within Texas.

Top 25%

By Volume:

slide consultation

In 2012, Dr. John M. Stewart, PHD, MD performed more slide consultation procedures for Medicare patients than 75% of providers in related specialties within Texas.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2012 were lab tests, cytology and second opinions.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

cytology	235
lab tests	235
second opinions	89

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2013 were cytology, lab tests, second opinions and minor procedures.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

aspiration	21
cytology	295
diagnostic procedures	21
lab tests	287
minimally invasive procedures	21
minor procedures	21
second opinions	84

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	354
Female	450

**Ethnicity**
Non-Hispanic White	640
Black	68
Hispanic	56
Asian	29
Other	0
Native American	0

**Age**
From 65 to 74	445
From 75 to 84	211
85 and over	42
Less than 65	106

Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD in 2013

Hypertension	74
High Cholesterol	60
Stroke	4
Ischemic Heart Disease	42
Depression	26
Chronic Kidney Disease	33
Asthma	10
Osteoperosis	12
Atrial Fibrilation	11
Heart Failure	20
Chronic Obstructive Pulmonary Disease	23
Diabetes	29
Dementia	5
Cancer	47

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2014 were cytology, lab tests, second opinions and minor procedures.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

aspiration	21
cytology	172
diagnostic procedures	21
lab tests	159
minimally invasive procedures	21
minor procedures	21
second opinions	56

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	297
Female	329

**Ethnicity**
Non-Hispanic White	480
Black	54
Hispanic	65
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	333
From 75 to 84	180
85 and over	23
Less than 65	90

Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD in 2014

Hypertension	75
High Cholesterol	62
Stroke	4
Ischemic Heart Disease	46
Depression	25
Chronic Kidney Disease	35
Asthma	7
Osteoperosis	11
Atrial Fibrilation	12
Heart Failure	18
Chronic Obstructive Pulmonary Disease	24
Diabetes	35
Dementia	5
Cancer	49

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2015 were cytology, lab tests, second opinions and minor procedures.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

aspiration	13
cytology	312
diagnostic procedures	13
lab tests	189
minimally invasive procedures	13
minor procedures	13
second opinions	90

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	868
Female	864

**Ethnicity**
Non-Hispanic White	1344
Black	166
Hispanic	144
Asian	38
Other	0
Native American	0

**Age**
From 65 to 74	972
From 75 to 84	498
85 and over	62
Less than 65	200

Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD in 2015

Hypertension	74
High Cholesterol	60
Stroke	6
Ischemic Heart Disease	41
Depression	25
Chronic Kidney Disease	39
Asthma	16
Osteoperosis	10
Atrial Fibrilation	11
Heart Failure	17
Chronic Obstructive Pulmonary Disease	21
Diabetes	32
Dementia	7
Cancer	45

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2016 were cytology, lab tests, second opinions and minor procedures.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

aspiration	16
cytology	266
diagnostic procedures	16
lab tests	139
minimally invasive procedures	16
minor procedures	16
second opinions	104

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	440
Female	385

**Ethnicity**
Non-Hispanic White	632
Black	73
Hispanic	71
Asian	30
Other	0
Native American	0

**Age**
From 65 to 74	500
From 75 to 84	214
85 and over	38
Less than 65	73

Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD in 2016

Hypertension	75
High Cholesterol	59
Stroke	5
Ischemic Heart Disease	44
Depression	24
Chronic Kidney Disease	41
Asthma	24
Osteoperosis	9
Atrial Fibrilation	13
Heart Failure	20
Chronic Obstructive Pulmonary Disease	22
Diabetes	32
Dementia	13
Cancer	43

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2017 were cytology, lab tests, second opinions and minor procedures.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

aspiration	12
cytology	312
diagnostic procedures	12
lab tests	183
minimally invasive procedures	12
minor procedures	12
second opinions	110

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	475
Female	422

**Ethnicity**
Non-Hispanic White	668
Black	89
Hispanic	73
Asian	41
Other	0
Native American	0

**Age**
From 65 to 74	515
From 75 to 84	261
85 and over	38
Less than 65	83

Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD in 2017

Hypertension	74
High Cholesterol	56
Stroke	6
Ischemic Heart Disease	41
Depression	31
Chronic Kidney Disease	45
Asthma	10
Osteoperosis	9
Atrial Fibrilation	14
Heart Failure	21
Chronic Obstructive Pulmonary Disease	23
Diabetes	32
Dementia	12
Cancer	48

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2018 were cytology, lab tests and second opinions.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

cytology	356
lab tests	213
second opinions	125

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	485
Female	516

**Ethnicity**
Non-Hispanic White	770
Black	85
Hispanic	88
Asian	30
Other	0
Native American	0

**Age**
From 65 to 74	550
From 75 to 84	302
85 and over	45
Less than 65	104

Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD in 2018

Hypertension	74
High Cholesterol	61
Stroke	6
Ischemic Heart Disease	43
Depression	33
Chronic Kidney Disease	48
Asthma	6
Osteoperosis	10
Atrial Fibrilation	12
Heart Failure	21
Chronic Obstructive Pulmonary Disease	20
Diabetes	33
Dementia	15
Cancer	47

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2019 were cytology, lab tests and second opinions.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

cytology	461
lab tests	255
second opinions	196

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	529
Female	472

**Ethnicity**
Non-Hispanic White	789
Black	87
Hispanic	69
Asian	34
Other	0
Native American	0

**Age**
From 65 to 74	556
From 75 to 84	300
85 and over	44
Less than 65	101

Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD in 2019

Hypertension	75
High Cholesterol	65
Stroke	7
Ischemic Heart Disease	46
Depression	31
Chronic Kidney Disease	50
Asthma	8
Osteoperosis	11
Atrial Fibrilation	15
Heart Failure	23
Chronic Obstructive Pulmonary Disease	20
Diabetes	32
Dementia	15
Cancer	44

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2020 were cytology, lab tests and second opinions.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

cytology	543
lab tests	219
second opinions	109

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	521
Female	539

**Ethnicity**
Non-Hispanic White	815
Black	86
Hispanic	77
Asian	50
Other	32
Native American	0

**Age**
From 65 to 74	588
From 75 to 84	312
85 and over	60
Less than 65	100

Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD in 2020

Hypertension	73
High Cholesterol	60
Stroke	6
Ischemic Heart Disease	40
Depression	28
Chronic Kidney Disease	47
Asthma	8
Osteoperosis	10
Atrial Fibrilation	14
Heart Failure	20
Chronic Obstructive Pulmonary Disease	18
Diabetes	28
Dementia	13
Cancer	43

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2021 were cytology, lab tests and second opinions.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

cytology	560
lab tests	243
second opinions	92

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	538
Female	463

**Ethnicity**
Non-Hispanic White	777
Black	67
Hispanic	82
Asian	38
Other	0
Native American	0

**Age**
From 65 to 74	562
From 75 to 84	309
85 and over	52
Less than 65	78

Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD in 2021

Hypertension	75
High Cholesterol	61
Stroke	7
Ischemic Heart Disease	42
Depression	30
Chronic Kidney Disease	52
Asthma	8
Osteoperosis	12
Atrial Fibrilation	14
Heart Failure	22
Chronic Obstructive Pulmonary Disease	16
Diabetes	32
Dementia	15
Cancer	41

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2022 were cytology, lab tests and second opinions.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

cytology	654
lab tests	297
second opinions	80

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	598
Female	582

**Ethnicity**
Non-Hispanic White	904
Black	85
Hispanic	88
Asian	54
Other	0
Native American	0

**Age**
From 65 to 74	687
From 75 to 84	360
85 and over	51
Less than 65	82

Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD in 2022

Hypertension	75
High Cholesterol	71
Stroke	10
Ischemic Heart Disease	33
Depression	21
Chronic Kidney Disease	29
Asthma	12
Osteoperosis	16
Atrial Fibrilation	18
Heart Failure	18
Chronic Obstructive Pulmonary Disease	20
Diabetes	30
Dementia	8
Cancer	54

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX during 2023 were cytology, lab tests and second opinions.

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

cytology	615
lab tests	315
second opinions	167

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	625
Female	489

**Ethnicity**
Non-Hispanic White	899
Black	65
Hispanic	57
Asian	46
Other	0
Native American	0

**Age**
From 65 to 74	602
From 75 to 84	387
85 and over	59
Less than 65	66

Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	12
Ischemic Heart Disease	36
Depression	21
Chronic Kidney Disease	30
Asthma	10
Osteoperosis	15
Atrial Fibrilation	21
Heart Failure	18
Chronic Obstructive Pulmonary Disease	22
Diabetes	34
Dementia	10
Cancer	51

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Volume of procedures performed by Dr. John M. Stewart, PHD, MD for Medicare patients.

The highest averages for the top procedures that Dr. John M. Stewart, PHD, MD treated as a cytopathologist in Houston, TX were cytology, lab tests, second opinions and minor procedures.

aspiration	16
cytology	398
diagnostic procedures	16
lab tests	227
minimally invasive procedures	16
minor procedures	16
second opinions	108

Average Medicare Patient Data From 2012 - 2023

Information about Medicare patients treated by Dr. John M. Stewart, PHD, MD.

**Gender**
Male	477
Female	459

**Ethnicity**
Black / African American	77
Asian / Pacific Islander	32
Non-Hispanic White	726
Hispanic	72
Native American / Alaskan Native	0
Other	2

**Age**
75 to 84	277
85 and over	42
Less than 65	90
65 to 74	525

Average of Total of Conditions of Medicare patients treated by Dr. John M. Stewart, PHD, MD From 2012 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. John M. Stewart, PHD, MD treated were hypertension, high cholesterol, cancer and chronic kidney disease.

Hypertension	68
High Cholesterol	57
Stroke	6
Ischemic Heart Disease	37
Depression	24
Chronic Kidney Disease	37
Asthma	9
Osteoporosis	10
Heart Failure	18
Chronic Obstructive Pulmonary Disease	19
Diabetes	29
Atrial Fibrillation	12
Cancer	42
Dementia	9

Education & Training

Dr. John M. Stewart, PHD, MD graduated from University of Virginia School of Medicine in 1993. He completed residency at University of Rochester Medical Center. He is certified by the Texas Medical Board Physician License and has a state license in Texas.

Medical School: University of Virginia School of Medicine (1993)

Residency: University of Rochester Medical Center (1999)

Board Certification: Texas Medical Board Physician License (2004)

Licensed In: Texas

Affiliations & Hospitals

Dr. John M. Stewart, PHD, MD is associated with these hospitals and organizations:

The University of Texas MD Anderson Cancer Center

Ratings & Reviews

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General Payments

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

**Payments by Company**
Olympus Corporation of the Americas	$7,450 Respiratory Products $2,991	Surgical Endoscopy Products $2,678	Endoscopy Products $960	Olympus Respiratory Accessories $788	Surgical Energy Products $33
Olympus America Inc.	$2,786 Respiratory Products $2,700	Surgical Endoscopy Products $86
Sumitomo Pharma America, Inc.	$26 GEMTESA $26
AstraZeneca Pharmaceuticals LP	$14 FLUMIST QUADRIVALENT $14

**Types of Payments**
Education	$10,008
Food and Beverage	$267

Biography

Dr. John Stewart is a Houston, TX physician who specializes in cytopathology. Dr. Stewart is professionally affiliated with The University of Texas MD Anderson Cancer Center. Before performing his residency at the University of Rochester Medical Center, Dr. Stewart attended the University of Virginia School of Medicine.