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Dr. William Stephen Knapp, DO

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Specializes in: Internal Medicine (Adult Medicine), Family Medicine and Geriatrics (Elderly Care)

A.T. Still University, Kirksville College of Osteopathic Medicine

2137 Charbonier Road Suite B, 2 Locations
Florissant, MO 63031

(636) 441-0067

Dr. William Stephen Knapp, DO is an internist in Florissant, MO specializing in internal medicine (adult medicine), family medicine and geriatrics (elderly care). He graduated from A.T. Still University, Kirksville College of Osteopathic Medicine. Dr. William Stephen Knapp, DO is affiliated with SSM Health DePaul Hospital, Esse Health, SSM Health, Christian Hospital, SSM Health St. Joseph Hospital - St. Charles, DePaul Hospital and AMERICAN MULTISPECIALTY GROUP INC.

Office Locations

2137 Charbonier Road Suite B, 2 Locations
Florissant, MO 63031

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4800 Mexico Road Suite 102
Saint Peters, MO 63376

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Noteworthy Medicare Patient Procedures Performed by Dr. William Stephen Knapp, DO in 2023

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

Top 5%

By Volume:

screening PSA test

By Affordability:

blood count tests

prostate screening

prostate-specific antigen test

screening PSA test

sed rate

vitamin D test

In 2023, among providers in related specialties within Missouri, Dr. William Stephen Knapp, DO performed more screening PSA test procedures for Medicare patients than 95% of them and he also had a list price for blood count tests, prostate screening, prostate-specific antigen (PSA) test, screening PSA test, sed rate (ESR), and vitamin D test that was lower than the list prices billed to Medicare by 95% of them. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Top 10%

By Volume:

lab tests

preventive care

By Affordability:

immunization

vaccines

In 2023, among providers in related specialties within Missouri, Dr. William Stephen Knapp, DO performed more lab tests, and preventive care procedures for Medicare patients than 90% of them and he also had a list price for immunization (preventive vaccines), and vaccines that was lower than the list prices billed to Medicare by 90% of them. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Top 25%

By Volume:

blood draw

lipid profile

phlebotomy for lab tests

By Affordability:

microalbumin urine test

In 2012, among providers in related specialties within Missouri, Dr. William Stephen Knapp, DO performed more blood draw, lipid profile, and phlebotomy for lab tests procedures for Medicare patients than 75% of them and he also had a list price for complete blood count (CBC), flu shot, flu vaccine, lipid profile, metabolic panel, microalbumin test, and microalbumin urine test that was lower than the list prices billed to Medicare by 75% of them. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO during 2012 were lab tests, nursing home care, preventive care and blood draw.

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

blood draw	534
diabetes management	161
diagnostic evaluation	14
doctor visit	709
ear procedures	17
hospital care	458
inpatient care	458
lab tests	2054
nursing home care	663
preventive care	583
rehabilitation	233
thoracic (chest) imaging	13
thyroid function tests	248
vaccines	76
vascular procedures	40
X-rays	13

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO during 2013 were lab tests, preventive care, blood draw and inpatient care.

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

aspiration	28
blood draw	464
diabetes management	129
diagnostic evaluation	24
doctor visit	565
ear procedures	20
hospital care	204
injections	28
inpatient care	204
lab tests	1762
nursing home care	153
preventive care	519
rehabilitation	171
thyroid function tests	195
vaccines	68
vascular procedures	52

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. William Stephen Knapp, DO.

**Gender**
Male	133
Female	147

**Ethnicity**
Non-Hispanic White	250
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	107
From 75 to 84	69
85 and over	70
Less than 65	34

Conditions of Medicare patients treated by Dr. William Stephen Knapp, DO in 2013

Hypertension	75
High Cholesterol	59
Stroke	5
Ischemic Heart Disease	48
Depression	35
Chronic Kidney Disease	33
Asthma	4
Osteoperosis	7
Atrial Fibrilation	10
Heart Failure	23
Chronic Obstructive Pulmonary Disease	24
Diabetes	31
Dementia	24
Cancer	10

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO during 2014 were lab tests, preventive care, blood draw and inpatient care.

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

blood draw	456
diabetes management	122
diagnostic evaluation	11
doctor visit	563
ear procedures	16
hospital care	244
inpatient care	244
lab tests	1670
nursing home care	134
preventive care	468
rehabilitation	112
thyroid function tests	199
vaccines	84
vascular procedures	44

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. William Stephen Knapp, DO.

**Gender**
Male	121
Female	133

**Ethnicity**
Non-Hispanic White	220
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	103
From 75 to 84	62
85 and over	55
Less than 65	34

Conditions of Medicare patients treated by Dr. William Stephen Knapp, DO in 2014

Hypertension	75
High Cholesterol	61
Stroke	7
Ischemic Heart Disease	52
Depression	34
Chronic Kidney Disease	32
Asthma	0
Osteoperosis	8
Atrial Fibrilation	15
Heart Failure	21
Chronic Obstructive Pulmonary Disease	25
Diabetes	30
Dementia	22
Cancer	8

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO during 2015 were lab tests, preventive care, blood draw and thyroid function tests.

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

blood draw	426
diabetes management	123
diagnostic evaluation	14
doctor visit	522
hospital care	182
inpatient care	182
lab tests	1574
nursing home care	62
preventive care	466
rehabilitation	150
thyroid function tests	204
vaccines	81
vascular procedures	19

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. William Stephen Knapp, DO.

**Gender**
Male	224
Female	218

**Ethnicity**
Non-Hispanic White	392
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	176
From 75 to 84	112
85 and over	94
Less than 65	60

Conditions of Medicare patients treated by Dr. William Stephen Knapp, DO in 2015

Hypertension	75
High Cholesterol	66
Stroke	5
Ischemic Heart Disease	50
Depression	29
Chronic Kidney Disease	32
Asthma	12
Osteoperosis	7
Atrial Fibrilation	11
Heart Failure	20
Chronic Obstructive Pulmonary Disease	29
Diabetes	33
Dementia	17
Cancer	7

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO during 2016 were lab tests, blood draw, preventive care and thyroid function tests.

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

blood draw	420
diabetes management	115
doctor visit	494
ear procedures	13
hospital care	183
inpatient care	183
lab tests	1484
nursing home care	27
preventive care	383
thyroid function tests	193
vaccines	56
vascular procedures	13

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. William Stephen Knapp, DO.

**Gender**
Male	106
Female	109

**Ethnicity**
Non-Hispanic White	189
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	87
From 75 to 84	55
85 and over	41
Less than 65	32

Conditions of Medicare patients treated by Dr. William Stephen Knapp, DO in 2016

Hypertension	75
High Cholesterol	59
Stroke	0
Ischemic Heart Disease	46
Depression	29
Chronic Kidney Disease	39
Asthma	28
Osteoperosis	7
Atrial Fibrilation	13
Heart Failure	22
Chronic Obstructive Pulmonary Disease	27
Diabetes	33
Dementia	18
Cancer	6

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO during 2017 were lab tests, blood draw, preventive care and thyroid function tests.

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

aspiration	13
blood draw	441
diabetes management	114
doctor visit	512
ear procedures	28
hospital care	62
injections	13
inpatient care	62
lab tests	1474
musculoskeletal imaging	18
preventive care	357
thyroid function tests	218
vaccines	112
vascular procedures	12
X-rays	18

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. William Stephen Knapp, DO.

**Gender**
Male	103
Female	102

**Ethnicity**
Non-Hispanic White	180
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	98
From 75 to 84	55
85 and over	25
Less than 65	27

Conditions of Medicare patients treated by Dr. William Stephen Knapp, DO in 2017

Hypertension	75
High Cholesterol	64
Stroke	0
Ischemic Heart Disease	40
Depression	31
Chronic Kidney Disease	38
Asthma	0
Osteoperosis	8
Atrial Fibrilation	12
Heart Failure	21
Chronic Obstructive Pulmonary Disease	26
Diabetes	29
Dementia	13
Cancer	9

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO during 2018 were lab tests, blood draw, preventive care and thyroid function tests.

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

aspiration	17
blood draw	379
diabetes management	95
doctor visit	419
ear procedures	20
hospital care	49
injections	17
inpatient care	49
lab tests	1337
musculoskeletal imaging	14
preventive care	358
thyroid function tests	161
vaccines	78
X-rays	14

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. William Stephen Knapp, DO.

**Gender**
Male	91
Female	102

**Ethnicity**
Non-Hispanic White	165
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	89
From 75 to 84	51
85 and over	28
Less than 65	25

Conditions of Medicare patients treated by Dr. William Stephen Knapp, DO in 2018

Hypertension	75
High Cholesterol	75
Stroke	6
Ischemic Heart Disease	36
Depression	31
Chronic Kidney Disease	39
Asthma	0
Osteoperosis	10
Atrial Fibrilation	12
Heart Failure	23
Chronic Obstructive Pulmonary Disease	30
Diabetes	28
Dementia	13
Cancer	12

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO during 2019 were lab tests, preventive care, blood draw and thyroid function tests.

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

blood draw	182
diabetes management	37
doctor visit	168
lab tests	606
preventive care	182
thyroid function tests	81
vaccines	34

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. William Stephen Knapp, DO.

**Gender**
Male	71
Female	65

**Ethnicity**
Non-Hispanic White	123
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	75
From 75 to 84	36
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Stephen Knapp, DO in 2019

Hypertension	75
High Cholesterol	72
Stroke	0
Ischemic Heart Disease	31
Depression	33
Chronic Kidney Disease	40
Asthma	0
Osteoperosis	9
Atrial Fibrilation	10
Heart Failure	23
Chronic Obstructive Pulmonary Disease	29
Diabetes	25
Dementia	10
Cancer	13

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO during 2020 were lab tests, preventive care, blood draw and thyroid function tests.

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

blood draw	267
diabetes management	60
doctor visit	295
lab tests	966
preventive care	278
thyroid function tests	133
vaccines	57

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. William Stephen Knapp, DO.

**Gender**
Male	74
Female	78

**Ethnicity**
Non-Hispanic White	127
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	68
From 75 to 84	55
85 and over	14
Less than 65	15

Conditions of Medicare patients treated by Dr. William Stephen Knapp, DO in 2020

Hypertension	75
High Cholesterol	72
Stroke	0
Ischemic Heart Disease	32
Depression	29
Chronic Kidney Disease	36
Asthma	0
Osteoperosis	7
Atrial Fibrilation	7
Heart Failure	20
Chronic Obstructive Pulmonary Disease	24
Diabetes	24
Dementia	13
Cancer	9

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO during 2021 were lab tests, blood draw, preventive care and thyroid function tests.

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

blood draw	285
diabetes management	63
doctor visit	325
lab tests	1070
preventive care	272
thyroid function tests	135
vaccines	52

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. William Stephen Knapp, DO.

**Gender**
Male	83
Female	90

**Ethnicity**
Non-Hispanic White	151
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	76
From 75 to 84	73
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Stephen Knapp, DO in 2021

Hypertension	70
High Cholesterol	67
Stroke	0
Ischemic Heart Disease	29
Depression	28
Chronic Kidney Disease	32
Asthma	0
Osteoperosis	13
Atrial Fibrilation	10
Heart Failure	17
Chronic Obstructive Pulmonary Disease	20
Diabetes	20
Dementia	10
Cancer	10

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO during 2022 were lab tests, blood draw, preventive care and thyroid function tests.

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

blood draw	271
diabetes management	53
doctor visit	280
lab tests	1062
preventive care	259
thyroid function tests	137
vaccines	40

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. William Stephen Knapp, DO.

**Gender**
Male	73
Female	70

**Ethnicity**
Non-Hispanic White	127
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	60
From 75 to 84	62
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Stephen Knapp, DO in 2022

Hypertension	75
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	31
Depression	29
Chronic Kidney Disease	32
Asthma	8
Osteoperosis	22
Atrial Fibrilation	21
Heart Failure	20
Chronic Obstructive Pulmonary Disease	29
Diabetes	22
Dementia	8
Cancer	15

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. William Stephen Knapp, DO for Medicare patients.

The highest averages for the top procedures that Dr. William Stephen Knapp, DO treated as an internist in Florissant, MO were lab tests, preventive care, blood draw and nursing home care.

aspiration	19
blood draw	375
diabetes management	97
diagnostic evaluation	15
doctor visit	441
ear procedures	19
hospital care	197
injections	19
inpatient care	197
lab tests	1369
musculoskeletal imaging	16
nursing home care	207
preventive care	375
rehabilitation	166
thoracic (chest) imaging	13
thyroid function tests	173
vaccines	67
vascular procedures	30
X-rays	15

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. William Stephen Knapp, DO.

**Gender**
Male	98
Female	101

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	174
Hispanic	0
Native American / Alaskan Native	0
Other	0

**Age**
75 to 84	57
85 and over	29
Less than 65	20
65 to 74	85

Average of Total of Conditions of Medicare patients treated by Dr. William Stephen Knapp, DO From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. William Stephen Knapp, DO treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension	67
High Cholesterol	60
Stroke	2
Ischemic Heart Disease	35
Depression	28
Chronic Kidney Disease	32
Asthma	4
Osteoporosis	8
Heart Failure	19
Chronic Obstructive Pulmonary Disease	23
Diabetes	25
Atrial Fibrillation	11
Cancer	9
Dementia	13

Education & Training

Dr. William Stephen Knapp, DO graduated from A.T. Still University, Kirksville College of Osteopathic Medicine. He completed residency at Normandy Osteopathic Hospital. He is certified by the American Osteopathic Board Geriatric (FP) American Osteopathic Board of Family Physicians Drug Enforcement Administration Missouri Dept of Health/Narcotics&Dangerous Drugs Missouri State Board of Registration and has a state license in Missouri.

Medical School: A.T. Still University, Kirksville College of Osteopathic Medicine

Residency: Normandy Osteopathic Hospital

Board Certification: American Osteopathic Board Geriatric (FP) American Osteopathic Board of Family Physicians Drug Enforcement Administration Missouri Dept of Health/Narcotics&Dangerous Drugs Missouri State Board of Registration

Licensed In: Missouri

Affiliations & Hospitals

Dr. William Stephen Knapp, DO is associated with these hospitals and organizations:

SSM Health DePaul Hospital

Esse Health

SSM Health

Christian Hospital

SSM Health St. Joseph Hospital - St. Charles

DePaul Hospital

AMERICAN MULTISPECIALTY GROUP INC

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General Payments

These charts describe general payments received by Dr. William Stephen Knapp, DO. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
Actelion Pharmaceuticals, Ltd	$2,444 $2,444
Boehringer Ingelheim Pharmaceuticals, Inc.	$2,017 JARDIANCE $1,210	STIOLTO $227	SPIRIVA RESPIMAT $118	GLYXAMBI $105	Spiriva $91	Other $266
AstraZeneca UK Limited	$1,617 $1,617
Novo Nordisk Inc	$1,275 Victoza $358	Tresiba $233	Ozempic $229	NovoLog $178	Xultophy 100/3.6 $75	Other $203
Lilly USA, LLC	$1,250 BASAGLAR $410	JARDIANCE $288	TRULICITY $146	MOUNJARO $112	GLYXAMBI $100	Other $193
Other	$9,859 Tresiba $991	INVOKANA $738	FARXIGA $598	ConZip 100mg $500	XARELTO $346	Other $6,687

**Types of Payments**
Food and Beverage	$12,954
Travel and Lodging	$4,472
Honoraria	$500
Consulting Fee	$276
Education	$261

Research Payments

Dr. William Stephen Knapp, DO has received 87 research payments totaling $356,085.

Biography

Dr. W. Knapp is a family medicine and geriatrics (elderly care) specialist in Florissant, MO and Saint Peters, MO. Dr. Knapp's hospital/clinic affiliations include SSM Health DePaul Hospital, SSM Health St. Joseph Hospital - St. Charles, and Christian Hospital. After completing medical school at A.T. Still University, Kirksville College of Osteopathic Medicine, he performed his residency at Normandy Osteopathic Hospital.