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Home > MI Providers

Dr. William Clark Decker, DO

Accepting New Patients

(382 Ratings)

Specializes in: Adult Pulmonology and Adult Critical Care

Des Moines University, College of Osteopathic Medicine (1985)

777 Kimole Lane #250
Adrian, MI 49221

(517) 265-3411

Dr. William Clark Decker, DO is a pulmonologist in Adrian, MI specializing in adult pulmonology and adult critical care. He graduated from Des Moines University, College of Osteopathic Medicine in 1985 and has 41 years of experience. Dr. William Clark Decker, DO is affiliated with ProMedica, ProMedica Provider and PROMEDICA CENTRAL CORPORATION OF MICHIGAN.

Office Locations

777 Kimole Lane #250
Adrian, MI 49221

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ProMedica Provider

777 Kimole Lane
Suite 100 Adrian, MI 49221

(517) 265-3411

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Noteworthy Medicare Patient Procedures Performed by Dr. William Clark Decker, DO in 2023

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

Top 5%

By Affordability:

lung diffusion capacity test

pulmonary function test

pulmonary testing

In 2023, Dr. William Clark Decker, DO had a list price for lung diffusion capacity test (DLCO), pulmonary function test (PFT), and pulmonary testing that was lower than the list prices billed to Medicare by 95% of providers in related specialties within Michigan. 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 Affordability:

lung volume test

In 2023, Dr. William Clark Decker, DO had a list price for lung volume test that was lower than the list prices billed to Medicare by 90% of providers in related specialties within Michigan. 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:

inpatient hospital care

By Affordability:

hospital care

inpatient care

inpatient hospital care

In 2012, among providers in related specialties within Michigan, Dr. William Clark Decker, DO performed more inpatient hospital care (for patient admitted to hospital) procedures for Medicare patients than 75% of them and he also had a list price for hospital care, inpatient care, and inpatient hospital care (for patient admitted to hospital) 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 Clark Decker, DO treated as a pulmonologist in Adrian, MI during 2012 were hospital care, inpatient care, pulmonary testing and preventive care.

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

bronchoscopy	53
diagnostic procedures	34
doctor visit	2306
hospital care	1800
inpatient care	1800
minimally invasive procedures	53
preventive care	97
pulmonary testing	160
vaccines	97

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. William Clark Decker, DO treated as a pulmonologist in Adrian, MI during 2013 were hospital care, inpatient care, pulmonary testing and preventive care.

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

aspiration	17
bronchoscopy	35
diagnostic procedures	23
doctor visit	2428
hospital care	1458
inpatient care	1458
minimally invasive procedures	35
pleural drainage	17
preventive care	86
pulmonary testing	268
vaccines	86

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. William Clark Decker, DO.

**Gender**
Male	500
Female	655

**Ethnicity**
Non-Hispanic White	1094
Black	16
Hispanic	33
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	432
From 75 to 84	355
85 and over	134
Less than 65	234

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2013

Hypertension	74
High Cholesterol	54
Stroke	6
Ischemic Heart Disease	48
Depression	26
Chronic Kidney Disease	33
Asthma	21
Osteoperosis	9
Atrial Fibrilation	18
Heart Failure	37
Chronic Obstructive Pulmonary Disease	70
Diabetes	42
Dementia	12
Cancer	16

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. William Clark Decker, DO treated as a pulmonologist in Adrian, MI during 2014 were hospital care, inpatient care, pulmonary testing and preventive care.

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

bronchoscopy	24
diagnostic procedures	24
doctor visit	2202
hospital care	1080
inpatient care	1080
minimally invasive procedures	24
preventive care	40
pulmonary testing	236
vaccines	40

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. William Clark Decker, DO.

**Gender**
Male	464
Female	576

**Ethnicity**
Non-Hispanic White	981
Black	14
Hispanic	32
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	408
From 75 to 84	297
85 and over	122
Less than 65	213

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2014

Hypertension	75
High Cholesterol	56
Stroke	6
Ischemic Heart Disease	47
Depression	28
Chronic Kidney Disease	36
Asthma	22
Osteoperosis	11
Atrial Fibrilation	19
Heart Failure	38
Chronic Obstructive Pulmonary Disease	70
Diabetes	43
Dementia	12
Cancer	16

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. William Clark Decker, DO treated as a pulmonologist in Adrian, MI during 2015 were hospital care, inpatient care, pulmonary testing and nursing home care.

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

bronchoscopy	47
diagnostic procedures	31
doctor visit	2353
hospital care	1335
inpatient care	1335
minimally invasive procedures	47
nursing home care	65
preventive care	31
pulmonary testing	252
vaccines	31

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. William Clark Decker, DO.

**Gender**
Male	940
Female	1196

**Ethnicity**
Non-Hispanic White	1980
Black	36
Hispanic	82
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	848
From 75 to 84	566
85 and over	264
Less than 65	458

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2015

Hypertension	75
High Cholesterol	56
Stroke	7
Ischemic Heart Disease	46
Depression	31
Chronic Kidney Disease	39
Asthma	47
Osteoperosis	12
Atrial Fibrilation	20
Heart Failure	36
Chronic Obstructive Pulmonary Disease	75
Diabetes	42
Dementia	12
Cancer	16

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. William Clark Decker, DO treated as a pulmonologist in Adrian, MI during 2016 were hospital care, inpatient care, pulmonary testing and nursing home care.

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

bronchoscopy	47
diagnostic procedures	21
doctor visit	2253
hospital care	874
inpatient care	874
minimally invasive procedures	47
nursing home care	63
pulmonary testing	274

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. William Clark Decker, DO.

**Gender**
Male	423
Female	538

**Ethnicity**
Non-Hispanic White	898
Black	13
Hispanic	38
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	364
From 75 to 84	286
85 and over	117
Less than 65	194

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2016

Hypertension	75
High Cholesterol	54
Stroke	4
Ischemic Heart Disease	46
Depression	32
Chronic Kidney Disease	39
Asthma	72
Osteoperosis	10
Atrial Fibrilation	20
Heart Failure	36
Chronic Obstructive Pulmonary Disease	73
Diabetes	39
Dementia	12
Cancer	15

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. William Clark Decker, DO treated as a pulmonologist in Adrian, MI during 2017 were hospital care, inpatient care, pulmonary testing and nursing home care.

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

bronchoscopy	45
diagnostic procedures	18
doctor visit	2203
hospital care	792
inpatient care	792
minimally invasive procedures	45
nursing home care	72
pulmonary testing	204

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. William Clark Decker, DO.

**Gender**
Male	385
Female	523

**Ethnicity**
Non-Hispanic White	853
Black	0
Hispanic	34
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	385
From 75 to 84	257
85 and over	107
Less than 65	159

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2017

Hypertension	71
High Cholesterol	51
Stroke	4
Ischemic Heart Disease	45
Depression	32
Chronic Kidney Disease	37
Asthma	19
Osteoperosis	10
Atrial Fibrilation	16
Heart Failure	32
Chronic Obstructive Pulmonary Disease	71
Diabetes	37
Dementia	14
Cancer	14

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. William Clark Decker, DO treated as a pulmonologist in Adrian, MI during 2018 were hospital care, inpatient care, pulmonary testing and nursing home care.

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

bronchoscopy	28
diagnostic procedures	14
doctor visit	1776
hospital care	507
inpatient care	507
minimally invasive procedures	28
nursing home care	55
pulmonary testing	134

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. William Clark Decker, DO.

**Gender**
Male	334
Female	456

**Ethnicity**
Non-Hispanic White	748
Black	0
Hispanic	27
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	315
From 75 to 84	225
85 and over	93
Less than 65	157

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2018

Hypertension	74
High Cholesterol	61
Stroke	5
Ischemic Heart Disease	45
Depression	33
Chronic Kidney Disease	40
Asthma	18
Osteoperosis	12
Atrial Fibrilation	18
Heart Failure	36
Chronic Obstructive Pulmonary Disease	72
Diabetes	38
Dementia	12
Cancer	14

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. William Clark Decker, DO treated as a pulmonologist in Adrian, MI during 2019 were hospital care, inpatient care, pulmonary testing and bronchoscopy.

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

bronchoscopy	34
diagnostic procedures	20
doctor visit	1866
hospital care	335
inpatient care	335
minimally invasive procedures	34
pulmonary testing	133

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. William Clark Decker, DO.

**Gender**
Male	341
Female	442

**Ethnicity**
Non-Hispanic White	739
Black	0
Hispanic	27
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	330
From 75 to 84	242
85 and over	72
Less than 65	139

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2019

Hypertension	73
High Cholesterol	58
Stroke	4
Ischemic Heart Disease	44
Depression	32
Chronic Kidney Disease	36
Asthma	18
Osteoperosis	11
Atrial Fibrilation	17
Heart Failure	33
Chronic Obstructive Pulmonary Disease	68
Diabetes	35
Dementia	12
Cancer	13

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. William Clark Decker, DO treated as a pulmonologist in Adrian, MI during 2020 were hospital care, inpatient care, pulmonary testing and bronchoscopy.

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

bronchoscopy	16
doctor visit	1183
hospital care	377
inpatient care	377
minimally invasive procedures	16
preventive care	11
pulmonary testing	91
vaccines	11

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. William Clark Decker, DO.

**Gender**
Male	313
Female	395

**Ethnicity**
Non-Hispanic White	666
Black	0
Hispanic	30
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	295
From 75 to 84	215
85 and over	76
Less than 65	122

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2020

Hypertension	68
High Cholesterol	53
Stroke	4
Ischemic Heart Disease	41
Depression	29
Chronic Kidney Disease	41
Asthma	21
Osteoperosis	10
Atrial Fibrilation	16
Heart Failure	36
Chronic Obstructive Pulmonary Disease	60
Diabetes	33
Dementia	14
Cancer	11

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. William Clark Decker, DO treated as a pulmonologist in Adrian, MI during 2021 were hospital care, inpatient care and pulmonary testing.

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

doctor visit	994
hospital care	369
inpatient care	369
pulmonary testing	99

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. William Clark Decker, DO.

**Gender**
Male	320
Female	381

**Ethnicity**
Non-Hispanic White	665
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	303
From 75 to 84	217
85 and over	75
Less than 65	106

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2021

Hypertension	69
High Cholesterol	58
Stroke	5
Ischemic Heart Disease	41
Depression	26
Chronic Kidney Disease	39
Asthma	19
Osteoperosis	10
Atrial Fibrilation	18
Heart Failure	34
Chronic Obstructive Pulmonary Disease	54
Diabetes	35
Dementia	12
Cancer	15

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. William Clark Decker, DO treated as a pulmonologist in Adrian, MI during 2022 were hospital care, inpatient care and pulmonary testing.

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

doctor visit	875
hospital care	315
inpatient care	315
pulmonary testing	114

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. William Clark Decker, DO.

**Gender**
Male	264
Female	325

**Ethnicity**
Non-Hispanic White	563
Black	0
Hispanic	14
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	250
From 75 to 84	196
85 and over	59
Less than 65	84

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2022

Hypertension	75
High Cholesterol	71
Stroke	6
Ischemic Heart Disease	34
Depression	29
Chronic Kidney Disease	28
Asthma	26
Osteoperosis	15
Atrial Fibrilation	25
Heart Failure	35
Chronic Obstructive Pulmonary Disease	61
Diabetes	37
Dementia	7
Cancer	16

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. William Clark Decker, DO for Medicare patients.

The highest averages for the top procedures that Dr. William Clark Decker, DO treated as a pulmonologist in Adrian, MI were hospital care, inpatient care, pulmonary testing and nursing home care.

aspiration	17
bronchoscopy	36
diagnostic procedures	23
doctor visit	1858
hospital care	840
inpatient care	840
minimally invasive procedures	36
nursing home care	63
pleural drainage	17
preventive care	53
pulmonary testing	178
vaccines	53

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. William Clark Decker, DO.

**Gender**
Male	389
Female	498

**Ethnicity**
Black / African American	7
Asian / Pacific Islander	0
Non-Hispanic White	835
Hispanic	28
Native American / Alaskan Native	0
Other	0

**Age**
75 to 84	259
85 and over	101
Less than 65	169
65 to 74	357

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

The highest averages of the most common conditions of Medicare patients that Dr. William Clark Decker, DO treated were hypertension, chronic obstructive pulmonary disease, high cholesterol and ischemic heart disease.

Hypertension	66
High Cholesterol	52
Stroke	4
Ischemic Heart Disease	39
Depression	27
Chronic Kidney Disease	33
Asthma	25
Osteoporosis	10
Heart Failure	32
Chronic Obstructive Pulmonary Disease	61
Diabetes	34
Atrial Fibrillation	17
Cancer	13
Dementia	10

Education & Training

Dr. William Clark Decker, DO graduated from Des Moines University, College of Osteopathic Medicine in 1985. He completed residency at St. John's Episcopal Hospital. He has a state license in Ohio.

Medical School: Des Moines University, College of Osteopathic Medicine (1985)

Residency: St. John's Episcopal Hospital

Licensed In: Ohio

Affiliations & Hospitals

Dr. William Clark Decker, DO is associated with these hospitals and organizations:

ProMedica

ProMedica Provider

PROMEDICA CENTRAL CORPORATION OF MICHIGAN

Ratings & Reviews

Dr. William Clark Decker, DO has an exceptional overall rating with an average of 4.88 out of 5 stars based on 382 ratings. We collect ratings and reviews of Dr. William Clark Decker, DO from all over the web to help you find the right in Adrian, MI.

4.88

Overall Rating

(382 Ratings)

Leave a Review

Reviews Left On DocSpot

Overall Rating: 5.0 2024-05-08

I have been a patient of Dr. Decker for almost 20 years with many episodes of Pneumonia and Asthma.  I am so blessed to be a one of his patients because he has helped me to have a much better quality of life with his knowledge and experience sand compassion!

Reviews From Around The Web

Overall Rating: 5.0 2024-10-18

Patient verified via Press Ganey

This was my first office visit in several years with this provider, Dr William Decker. He was my Pulmonary Dr several years ago. I had moved to another city and county, and was unable to continue to b continue under his care. Now I am able to continue under his care for my pulmonary condition. Dr William Decker comes highly recommended and is the best in his field of medicine.

Overall Rating: 5.0 2026-02-11

Patient verified via Press Ganey

Very thorough. Talked in layman terms. Easy for me to understand.

Overall Rating: 5.0 2026-03-15

Patient verified via Press Ganey

Dr Decker is incredibly caring and competent.

Overall Rating: 5.0 2026-02-12

Patient verified via Press Ganey

Best doctor I have

Overall Rating: 5.0 2025-11-08

Patient verified via Press Ganey

Brutally frank.

General Payments

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

**Payments by Company**
FOREST PHARMACEUTICALS, INC.	$6,752 DALIRESP $6,752
AstraZeneca Pharmaceuticals LP	$2,312 SYMBICORT $1,168	FASENRA $401	BREZTRI $325	BEVESPI AEROSPHERE $117	TEZSPIRE $93	Other $208
Boehringer Ingelheim Pharmaceuticals, Inc.	$1,305 OFEV $583	SPIRIVA RESPIMAT $471	COMBIVENT RESPIMAT $125	STIOLTO RESPIMAT $57	STIOLTO $44	Other $25
Mylan Specialty L.P.	$1,091 Yupelri $558	Perforomist $408	EpiPen $24	$101
Genentech USA, Inc.	$825 Esbriet $695	XOLAIR $130
Other	$4,906 DUPIXENT $1,185	Hizentra $372	XARELTO $256	TRELEGY ELLIPTA $209	NUCALA $192	Other $2,692

**Types of Payments**
Food and Beverage	$10,130
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$6,450
Education	$470
Travel and Lodging	$141

Biography

Dr. William Decker is a specialist in adult critical care and adult pulmonology. He works in Adrian, MI and Suite 100 Adrian, MI. He is professionally affiliated with ProMedica. After attending Des Moines University, College of Osteopathic Medicine for medical school, Dr. Decker completed his residency training at St. John's Episcopal Hospital and St. John Macomb-Oakland Hospital. On average, patients gave him a rating of 5.0 stars (out of 5). He has an open panel in Adrian, MI according to Doctor.com.

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Dr. William Clark Decker, DO

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. William Clark Decker, DO in 2023

By Affordability:

By Affordability:

By Volume:

By Affordability:

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. William Clark Decker, DO in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. William Clark Decker, DO in 2022

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Average Medicare Patient Data From 2012 - 2022

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

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography

Other Providers in Adrian, MI