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Dr. Michael A. Keller, MD, FACS

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Specializes in: Colon & Rectal Surgery and Surgical Oncology (Cancer Surgery)
University of Texas Medical School at Houston
Professional interests include: anal cancer, irritable bowel syndrome (IBS), abscess drainage, and more.
598 North Union Avenue Suite 200
New Braunfels, TX 78130

Dr. Michael A. Keller, MD, FACS is a colon and rectal surgeon in San Antonio, TX specializing in colon & rectal surgery and surgical oncology (cancer surgery). He graduated from University of Texas Medical School at Houston. Dr. Michael A. Keller, MD, FACS is affiliated with Methodist Health System, CHRISTUS Health, Texas Oncology, Methodist Hospital Methodist Hospital Stone Oak Methodist Hospital Specialty and Transplant Methodist Hospital Westover Hills and Texas Oncology - Boerne.

View Doctor's Full Profile (830) 730-5006

Office Locations

11130 Christus Hills, Plaza Iii Suite 210
San Antonio, TX 78251
open_in_new

Texas Oncology

124 E. Bandera Road Suite 301
Boerne, TX 78006
(210) 614-0880
(210) 615-0258
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CHRISTUS Health

598 North Union Avenue Suite 200
New Braunfels, TX 78130
(830) 730-5006
open_in_new
7940 Floyd Curl Drive Tower Ii, Suite 1010
San Antonio, TX 78229
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Some issues Dr. Michael A. Keller, MD, FACS can help you with:

Colonoscopy

Colonoscopy is the use of a special tool called a colonoscope (a thin, flexible tube with a camera on the end) to examine the inside of the colon and rectum. The tube is typically inserted anally, and it allows the physician to examine the large intestine from the inside. It may be done at any time to diagnose bowel problems, but routine colonoscopies are advised after the age of 50 to screen for colon cancer.

A colonoscopy may be performed to diagnose:

  • Intestinal ulcers
  • Polyps
  • Bowel cancer
  • An unidentified source of pain or bleeding in the intestine

Patients may be asked to drink only liquids in the days before a colonoscopy, or they may be given an enema to remove residual fecal matter. Before the exam, patients are given medication to help them relax, and then lay on their side on a table. The scope is inserted into the anus and gently moved all the way through the large intestine. Air may be pumped into the intestine to improve the view for the physician. Any polyps that are found will be removed. Then the colonoscope will be withdrawn. A colonoscopy is not usually painful, but patients may feel some bloating or have some cramps right afterward. If patients have polyps removed, they might experience a small amount of bleeding. Any side effects should go away within a few hours.

Laparoscopic Surgery

Laparoscopic surgery is a kind of minimally invasive surgery using a thin, narrow tube called a laparoscope. Usually performed on the abdomen or the pelvic region, the surgeon makes a few very small incisions instead of one large one.

During the procedure, the surgeon inserts the laparoscope, which contains a light and camera that allows the surgeon to see what is happening inside the body. Then tiny tools are placed through the small openings and used to perform the surgery.

The most common laparoscopic surgery is gallbladder removal, but laparoscopic surgery may also be used for the removal of a kidney or appendix, to treat certain cysts and tumors, for bariatric surgery, for some GERD treatments, or for hernia repairs, among others.

Because laparoscopic surgery only uses a few tiny incisions, the scars are minimal and recovery is easier than with open surgery.

Robotic Surgery

Robotic surgery is a type of minimally invasive surgery, using a tiny opening to get inside the body instead of making a large cut. It uses small tools attached to a thin robotic arm, which is controlled by the surgeon. Robotic surgery may be referred to by the specific kind of robot that is used. The most advanced robot currently in use is called the da Vinci, and surgery using it is sometimes called da Vinci surgery.

There are many benefits to robotic surgery, both for the patient and the surgeon. Robotic surgery allows for more precise movements and increased control during very delicate surgical procedures. This makes performing surgery accurately much easier for surgeons and reduces fatigue. The smaller 'hand' of the robot can enter the body via a much smaller opening, which reduces the risk of infection and scarring and leads to a faster recovery. The robotic hands also contain tiny moveable cameras among their tools, giving surgeons a much closer view of the procedure than would be possible with traditional surgery.

Noteworthy Medicare Patient Procedures Performed by Dr. Michael A. Keller, MD, FACS in 2023

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

Top 25%

By Volume:

inpatient hospital care

In 2012, Dr. Michael A. Keller, MD, FACS performed more inpatient hospital care (for patient admitted to hospital) 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. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX during 2012 were gastrointestinal procedures, hospital care, inpatient care and minimally invasive procedures.

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

abdominal surgery 11
doctor visit 24
gastrointestinal procedures 30
hospital care 21
inpatient care 21
minimally invasive procedures 19
open surgery 11

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX during 2013 were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

doctor visit 80
gastrointestinal procedures 23
hospital care 43
inpatient care 43
minimally invasive procedures 23

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael A. Keller, MD, FACS.

Gender
Male 40
Female 59
Ethnicity
Non-Hispanic White 76
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 51
From 75 to 84 27
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Michael A. Keller, MD, FACS in 2013

Hypertension 69
High Cholesterol 56
Stroke 0
Ischemic Heart Disease 38
Depression 32
Chronic Kidney Disease 32
Asthma 0
Osteoperosis 13
Atrial Fibrilation 0
Heart Failure 21
Chronic Obstructive Pulmonary Disease 12
Diabetes 26
Dementia 15
Cancer 23

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX during 2014 were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

diagnostic procedures 14
doctor visit 144
gastrointestinal procedures 64
hospital care 105
inpatient care 105
minimally invasive procedures 64
preventive care 12
removal of lesion (e.g. growth) 14

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael A. Keller, MD, FACS.

Gender
Male 70
Female 114
Ethnicity
Non-Hispanic White 124
Black 0
Hispanic 49
Asian 0
Other 0
Native American 0
Age
From 65 to 74 79
From 75 to 84 51
85 and over 25
Less than 65 29

Conditions of Medicare patients treated by Dr. Michael A. Keller, MD, FACS in 2014

Hypertension 75
High Cholesterol 64
Stroke 0
Ischemic Heart Disease 42
Depression 29
Chronic Kidney Disease 38
Asthma 13
Osteoperosis 13
Atrial Fibrilation 11
Heart Failure 24
Chronic Obstructive Pulmonary Disease 15
Diabetes 33
Dementia 14
Cancer 25

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX during 2015 were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

doctor visit 166
gastrointestinal procedures 37
hospital care 66
inpatient care 66
minimally invasive procedures 37

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael A. Keller, MD, FACS.

Gender
Male 148
Female 206
Ethnicity
Non-Hispanic White 246
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 176
From 75 to 84 92
85 and over 30
Less than 65 56

Conditions of Medicare patients treated by Dr. Michael A. Keller, MD, FACS in 2015

Hypertension 71
High Cholesterol 59
Stroke 0
Ischemic Heart Disease 44
Depression 22
Chronic Kidney Disease 37
Asthma 14
Osteoperosis 11
Atrial Fibrilation 11
Heart Failure 16
Chronic Obstructive Pulmonary Disease 14
Diabetes 34
Dementia 11
Cancer 28

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX during 2016 were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

doctor visit 146
gastrointestinal procedures 19
hospital care 83
inpatient care 83
minimally invasive procedures 19

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael A. Keller, MD, FACS.

Gender
Male 68
Female 87
Ethnicity
Non-Hispanic White 100
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 80
From 75 to 84 41
85 and over 12
Less than 65 22

Conditions of Medicare patients treated by Dr. Michael A. Keller, MD, FACS in 2016

Hypertension 66
High Cholesterol 62
Stroke 0
Ischemic Heart Disease 35
Depression 25
Chronic Kidney Disease 41
Asthma 20
Osteoperosis 15
Atrial Fibrilation 10
Heart Failure 15
Chronic Obstructive Pulmonary Disease 18
Diabetes 30
Dementia 17
Cancer 21

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX during 2017 were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

doctor visit 191
gastrointestinal procedures 46
hospital care 88
inpatient care 88
minimally invasive procedures 46
preventive care 31

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael A. Keller, MD, FACS.

Gender
Male 83
Female 124
Ethnicity
Non-Hispanic White 137
Black 0
Hispanic 48
Asian 0
Other 0
Native American 0
Age
From 65 to 74 98
From 75 to 84 66
85 and over 12
Less than 65 31

Conditions of Medicare patients treated by Dr. Michael A. Keller, MD, FACS in 2017

Hypertension 75
High Cholesterol 61
Stroke 0
Ischemic Heart Disease 40
Depression 27
Chronic Kidney Disease 45
Asthma 9
Osteoperosis 10
Atrial Fibrilation 10
Heart Failure 21
Chronic Obstructive Pulmonary Disease 13
Diabetes 36
Dementia 14
Cancer 29

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX during 2018 were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

doctor visit 194
gastrointestinal procedures 33
hospital care 138
inpatient care 138
minimally invasive procedures 33
preventive care 15

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael A. Keller, MD, FACS.

Gender
Male 93
Female 123
Ethnicity
Non-Hispanic White 133
Black 0
Hispanic 66
Asian 0
Other 0
Native American 0
Age
From 65 to 74 97
From 75 to 84 74
85 and over 15
Less than 65 30

Conditions of Medicare patients treated by Dr. Michael A. Keller, MD, FACS in 2018

Hypertension 73
High Cholesterol 60
Stroke 6
Ischemic Heart Disease 38
Depression 30
Chronic Kidney Disease 46
Asthma 13
Osteoperosis 6
Atrial Fibrilation 8
Heart Failure 20
Chronic Obstructive Pulmonary Disease 15
Diabetes 34
Dementia 19
Cancer 33

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX during 2019 were hospital care, inpatient care, gastrointestinal procedures and minimally invasive procedures.

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

anorectal procedures 13
doctor visit 195
gastrointestinal procedures 37
hospital care 152
inpatient care 152
manometry 13
minimally invasive procedures 24
preventive care 24

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael A. Keller, MD, FACS.

Gender
Male 98
Female 124
Ethnicity
Non-Hispanic White 135
Black 0
Hispanic 65
Asian 0
Other 0
Native American 0
Age
From 65 to 74 110
From 75 to 84 57
85 and over 16
Less than 65 39

Conditions of Medicare patients treated by Dr. Michael A. Keller, MD, FACS in 2019

Hypertension 75
High Cholesterol 65
Stroke 6
Ischemic Heart Disease 42
Depression 28
Chronic Kidney Disease 53
Asthma 8
Osteoperosis 9
Atrial Fibrilation 10
Heart Failure 24
Chronic Obstructive Pulmonary Disease 18
Diabetes 37
Dementia 15
Cancer 35

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX during 2020 were hospital care, inpatient care, catheterization and minimally invasive procedures.

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

catheterization 24
doctor visit 182
gastrointestinal procedures 23
hospital care 86
inpatient care 86
minimally invasive procedures 23
preventive care 11

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael A. Keller, MD, FACS.

Gender
Male 91
Female 115
Ethnicity
Non-Hispanic White 133
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 97
From 75 to 84 56
85 and over 22
Less than 65 31

Conditions of Medicare patients treated by Dr. Michael A. Keller, MD, FACS in 2020

Hypertension 75
High Cholesterol 70
Stroke 7
Ischemic Heart Disease 47
Depression 33
Chronic Kidney Disease 60
Asthma 9
Osteoperosis 11
Atrial Fibrilation 17
Heart Failure 26
Chronic Obstructive Pulmonary Disease 17
Diabetes 43
Dementia 20
Cancer 41

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX during 2021 were hospital care, inpatient care, catheterization and minimally invasive procedures.

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

catheterization 17
doctor visit 214
gastrointestinal procedures 12
hospital care 132
inpatient care 132
minimally invasive procedures 12
preventive care 12

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael A. Keller, MD, FACS.

Gender
Male 101
Female 119
Ethnicity
Non-Hispanic White 132
Black 0
Hispanic 71
Asian 0
Other 0
Native American 0
Age
From 65 to 74 96
From 75 to 84 66
85 and over 30
Less than 65 28

Conditions of Medicare patients treated by Dr. Michael A. Keller, MD, FACS in 2021

Hypertension 75
High Cholesterol 73
Stroke 5
Ischemic Heart Disease 42
Depression 29
Chronic Kidney Disease 53
Asthma 11
Osteoperosis 14
Atrial Fibrilation 12
Heart Failure 26
Chronic Obstructive Pulmonary Disease 12
Diabetes 40
Dementia 18
Cancer 38

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX during 2022 were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

abdominal surgery 12
catheterization 16
diagnostic procedures 14
doctor visit 246
gastrointestinal procedures 44
hospital care 126
inpatient care 126
minimally invasive procedures 44
removal of lesion (e.g. growth) 14

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael A. Keller, MD, FACS.

Gender
Male 105
Female 126
Ethnicity
Non-Hispanic White 148
Black 0
Hispanic 66
Asian 0
Other 0
Native American 0
Age
From 65 to 74 119
From 75 to 84 71
85 and over 20
Less than 65 21

Conditions of Medicare patients treated by Dr. Michael A. Keller, MD, FACS in 2022

Hypertension 75
High Cholesterol 75
Stroke 10
Ischemic Heart Disease 36
Depression 24
Chronic Kidney Disease 35
Asthma 13
Osteoperosis 13
Atrial Fibrilation 21
Heart Failure 16
Chronic Obstructive Pulmonary Disease 14
Diabetes 36
Dementia 9
Cancer 47

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Michael A. Keller, MD, FACS for Medicare patients.

The highest averages for the top procedures that Dr. Michael A. Keller, MD, FACS treated as a colon and rectal surgeon in San Antonio, TX were hospital care, inpatient care, gastrointestinal procedures and minimally invasive procedures.

abdominal surgery 11
anorectal procedures 13
catheterization 19
diagnostic procedures 14
doctor visit 162
gastrointestinal procedures 33
hospital care 94
inpatient care 94
manometry 13
minimally invasive procedures 31
open surgery 11
preventive care 17
removal of lesion (e.g. growth) 14

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Michael A. Keller, MD, FACS.

Gender
Male 81
Female 108
Ethnicity
Black / African American 0
Asian / Pacific Islander 0
Non-Hispanic White 124
Native American / Alaskan Native 0
Hispanic 33
Other 0
Age
75 to 84 54
85 and over 16
Less than 65 26
65 to 74 91

Average of Total of Conditions of Medicare patients treated by Dr. Michael A. Keller, MD, FACS From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Michael A. Keller, MD, FACS treated were hypertension, high cholesterol, chronic kidney disease and ischemic heart disease.

Hypertension 66
High Cholesterol 58
Stroke 3
Ischemic Heart Disease 36
Depression 25
Chronic Kidney Disease 40
Asthma 10
Osteoporosis 10
Heart Failure 19
Chronic Obstructive Pulmonary Disease 13
Diabetes 31
Atrial Fibrillation 10
Dementia 13
Cancer 29

Education & Training

Dr. Michael A. Keller, MD, FACS graduated from University of Texas Medical School at Houston. He completed residency at University of Mississippi Medical Center. He is certified by the Board Certification: General Surgery and has a state license in Texas.

Medical School: University of Texas Medical School at Houston

Residency: University of Mississippi Medical Center

Board Certification: Board Certification: General Surgery

Licensed In: Texas

Affiliations & Hospitals

Dr. Michael A. Keller, MD, FACS is associated with these hospitals and organizations:

Methodist Health System
CHRISTUS Health
Texas Oncology
Methodist Hospital Methodist Hospital Stone Oak Methodist Hospital Specialty and Transplant Methodist Hospital Westover Hills
Texas Oncology - Boerne

Ratings & Reviews

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General Payments

These charts describe general payments received by Dr. Michael A. Keller, MD, FACS. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

Payments by Company
Intuitive Surgical, Inc. $164,067 Da Vinci Surgical System
$164,067
Biom'Up SA $6,205 Hemoblast
$6,205
Novadaq Technologies Inc. $1,552 LUNA
$1,539 		PINPOINT
$13
TELA Bio, Inc. $1,369 OviTex Reinforced Bioscaffold With Permanent Polymer (OviTex)
$1,353 		Ovitex
$16
Salix Pharmaceuticals, Ltd $1,294 Solesta
$1,294
Other $6,790 STRATTICE
$1,203 		STRATTICE LAP
$1,159 		vitagel
$1,132 		GELPOINT PATH
$622 		HEMOBLAST Bellows
$387 		Other
$2,287
Types of Payments
Education $141,011
Travel and Lodging $19,832
Food and Beverage $15,634
Consulting Fee $4,500
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program $300

Biography

Dr. Michael Keller is a specialist in surgical oncology (cancer surgery) and colon & rectal surgery. He works in Boerne, TX, San Antonio, TX, and New Braunfels, TX. His areas of expertise include the following: rectocele (posterior prolapse), rectal cancer, and pain. Dr. Keller's professional affiliations include North Central Baptist Hospital, Texas Colon & Rectal Specialists, and Methodist Health System. He attended the University of Texas Medical School at Houston for medical school and subsequently trained at the University of Mississippi Medical Center for residency. Dr. Keller's distinctions include: Texas Super Doctors and Texas Rising Stars.

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