Procedure Volume Patient Data Patient Conditions Reviews General Payments Back to Top

Home > CA Providers

Dr. Corey M. Warner, MD

Accepting New Patients

(Dr. Corey Warner, M.D.)

(501 Ratings)

Specializes in: General Internal Medicine

Oregon Health & Science University School of Medicine (1997)

18990 Coyote Valley Road Hidden Valley
Lake, CA 95467

(707) 987-9024

Dr. Corey M. Warner, MD is a general internist in Clearlake, CA specializing in general internal medicine. He graduated from Oregon Health & Science University School of Medicine in 1997 and has 29 years of experience. Dr. Corey M. Warner, MD is affiliated with Adventist Health System, ADVENTIST HEALTH CLEARLAKE HOSPITAL INC and Network Provider.

Office Locations

15630 18th Avenue
Clearlake, CA 95422

open_in_new

18990 Coyote Valley Road Hidden Valley
Lake, CA 95467

(707) 987-9024

open_in_new

18990 Coyote Valley Road Suite 10
Hidden Valley Lake, CA 95467

(707) 987-8344

open_in_new

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Corey M. Warner, MD treated as a general internist in Clearlake, CA during 2012 were blood draw, preventive care and vaccines.

Volume of procedures performed by Dr. Corey M. Warner, MD for Medicare patients.

blood draw	594
doctor visit	2585
preventive care	197
vaccines	197

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Corey M. Warner, MD treated as a general internist in Clearlake, CA during 2013 were preventive care, lab tests and vaccines.

Volume of procedures performed by Dr. Corey M. Warner, MD for Medicare patients.

doctor visit	2531
lab tests	215
preventive care	251
vaccines	114

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Corey M. Warner, MD.

**Gender**
Male	312
Female	404

**Ethnicity**
Non-Hispanic White	644
Black	22
Hispanic	24
Asian	11
Other	0
Native American	0

**Age**
From 65 to 74	384
From 75 to 84	178
85 and over	67
Less than 65	87

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2013

Hypertension	67
High Cholesterol	55
Stroke	3
Ischemic Heart Disease	39
Depression	23
Chronic Kidney Disease	15
Asthma	8
Osteoperosis	4
Atrial Fibrilation	8
Heart Failure	16
Chronic Obstructive Pulmonary Disease	16
Diabetes	20
Dementia	7
Cancer	7

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Corey M. Warner, MD treated as a general internist in Clearlake, CA during 2014 were preventive care, lab tests and vaccines.

Volume of procedures performed by Dr. Corey M. Warner, MD for Medicare patients.

doctor visit	2797
lab tests	302
preventive care	464
vaccines	246

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Corey M. Warner, MD.

**Gender**
Male	357
Female	457

**Ethnicity**
Non-Hispanic White	727
Black	25
Hispanic	31
Asian	14
Other	0
Native American	0

**Age**
From 65 to 74	438
From 75 to 84	226
85 and over	65
Less than 65	85

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2014

Hypertension	70
High Cholesterol	57
Stroke	3
Ischemic Heart Disease	40
Depression	25
Chronic Kidney Disease	14
Asthma	8
Osteoperosis	6
Atrial Fibrilation	8
Heart Failure	16
Chronic Obstructive Pulmonary Disease	18
Diabetes	20
Dementia	7
Cancer	9

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Corey M. Warner, MD treated as a general internist in Clearlake, CA during 2015 were preventive care, vaccines and lab tests.

Volume of procedures performed by Dr. Corey M. Warner, MD for Medicare patients.

doctor visit	2619
lab tests	158
preventive care	313
vaccines	209

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Corey M. Warner, MD.

**Gender**
Male	804
Female	1022

**Ethnicity**
Non-Hispanic White	1624
Black	64
Hispanic	68
Asian	0
Other	34
Native American	0

**Age**
From 65 to 74	932
From 75 to 84	508
85 and over	158
Less than 65	228

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2015

Hypertension	65
High Cholesterol	53
Stroke	3
Ischemic Heart Disease	40
Depression	24
Chronic Kidney Disease	17
Asthma	11
Osteoperosis	4
Atrial Fibrilation	8
Heart Failure	16
Chronic Obstructive Pulmonary Disease	15
Diabetes	23
Dementia	9
Cancer	8

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

Volume of procedures performed by Dr. Corey M. Warner, MD for Medicare patients.

doctor visit	76

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Corey M. Warner, MD.

**Gender**
Male	37
Female	47

**Age**
From 65 to 74	37
From 75 to 84	29
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2016

Hypertension	75
High Cholesterol	64
Stroke	0
Ischemic Heart Disease	54
Depression	33
Chronic Kidney Disease	31
Asthma	31
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	30
Chronic Obstructive Pulmonary Disease	26
Diabetes	35
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

Volume of procedures performed by Dr. Corey M. Warner, MD for Medicare patients.

doctor visit	176

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Corey M. Warner, MD.

**Gender**
Male	52
Female	66

**Ethnicity**
Non-Hispanic White	101
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	56
From 75 to 84	49
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2018

Hypertension	63
High Cholesterol	59
Stroke	0
Ischemic Heart Disease	33
Depression	18
Chronic Kidney Disease	23
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	18
Chronic Obstructive Pulmonary Disease	9
Diabetes	27
Dementia	0
Cancer	10

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

Volume of procedures performed by Dr. Corey M. Warner, MD for Medicare patients.

doctor visit	243

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Corey M. Warner, MD.

**Gender**
Male	61
Female	70

**Ethnicity**
Non-Hispanic White	115
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	60
From 75 to 84	53
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2019

Hypertension	61
High Cholesterol	58
Stroke	0
Ischemic Heart Disease	34
Depression	16
Chronic Kidney Disease	24
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	21
Chronic Obstructive Pulmonary Disease	8
Diabetes	24
Dementia	0
Cancer	9

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

Volume of procedures performed by Dr. Corey M. Warner, MD for Medicare patients.

doctor visit	81

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Corey M. Warner, MD.

**Gender**
Male	36
Female	43

**Age**
From 65 to 74	41
From 75 to 84	24
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2020

Hypertension	59
High Cholesterol	61
Stroke	0
Ischemic Heart Disease	39
Depression	24
Chronic Kidney Disease	28
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	18
Chronic Obstructive Pulmonary Disease	0
Diabetes	24
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

Volume of procedures performed by Dr. Corey M. Warner, MD for Medicare patients.

doctor visit	43

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Corey M. Warner, MD.

**Gender**
Male	31
Female	31

**Age**
From 65 to 74	27
From 75 to 84	21
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2021

Hypertension	71
High Cholesterol	65
Stroke	0
Ischemic Heart Disease	32
Depression	0
Chronic Kidney Disease	29
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	18
Chronic Obstructive Pulmonary Disease	0
Diabetes	18
Dementia	18
Cancer	0

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2021

Volume of procedures performed by Dr. Corey M. Warner, MD for Medicare patients.

The highest averages for the top procedures that Dr. Corey M. Warner, MD treated as a general internist in Clearlake, CA were blood draw, preventive care, lab tests and vaccines.

blood draw	594
doctor visit	1239
lab tests	225
preventive care	306
vaccines	191

Average Medicare Patient Data From 2012 - 2021

Information about Medicare patients treated by Dr. Corey M. Warner, MD.

**Gender**
Male	187
Female	237

**Ethnicity**
Black / African American	12
Asian / Pacific Islander	2
Non-Hispanic White	356
Hispanic	13
Native American / Alaskan Native	0
Other	3

**Age**
75 to 84	120
85 and over	32
Less than 65	44
65 to 74	219

Average of Total of Conditions of Medicare patients treated by Dr. Corey M. Warner, MD From 2012 - 2021

The highest averages of the most common conditions of Medicare patients that Dr. Corey M. Warner, MD treated were hypertension, high cholesterol, ischemic heart disease and diabetes.

Hypertension	59
High Cholesterol	52
Stroke	1
Ischemic Heart Disease	34
Depression	18
Chronic Kidney Disease	20
Asthma	6
Osteoporosis	1
Heart Failure	17
Chronic Obstructive Pulmonary Disease	10
Diabetes	21
Atrial Fibrillation	2
Cancer	4
Dementia	4

Education & Training

Dr. Corey M. Warner, MD graduated from Oregon Health & Science University School of Medicine in 1997. He completed residency at Legacy Emanuel Medical Center. He is certified by the American Board of Internal Medicine and has a state license in Illinois.

Medical School: Oregon Health & Science University School of Medicine (1997)

Residency: Legacy Emanuel Medical Center

Board Certification: American Board of Internal Medicine

Licensed In: Illinois

Insurance Information

Please note: Insurance information may change at any time, and the provider may accept your insurance plan even if it is not listed below. Please contact the provider's office to confirm that your insurance is accepted.

Dr. Corey M. Warner, MD appears to accept the following insurance providers: TRICARE, Cigna, Partnership HealthPlan of California, Medi-Cal, Aetna, United Healthcare, TriWest, Health Net, BLUE CROSS CA, HEALTH NET MEDICARE MANAGED, ADVENTIST HEALTH and BLUE SHIELD CA.

Insurance Accepted by Provider includes:

According to our sources, Dr. Corey M. Warner, MD accepts the following insurance providers:

TRICARE

Cigna

Partnership HealthPlan of California

Medi-Cal

Aetna

United Healthcare

TriWest

Health Net

BLUE CROSS CA

HEALTH NET MEDICARE MANAGED

ADVENTIST HEALTH

BLUE SHIELD CA

Ratings & Reviews

Dr. Corey M. Warner, MD has an exceptional overall rating with an average of 4.9 out of 5 stars based on 501 ratings. We collect ratings and reviews of Dr. Corey M. Warner, MD from all over the web to help you find the right in Clearlake, CA.

4.9

Overall Rating

(501 Ratings)

Leave a Review

Reviews Left On DocSpot

Overall Rating: 5.0 2025-09-09

I have always come back as a patient to Dr. Warners when I can for easily over a decade may two because of changing insurance. I am now retired and back with him as my out of network Doctor. I have always felt well cared for by everyone in his office and I now know most of the staff by name and they know me. I have always been greeted with a smile even in my difficult times.  I have never seen any other patients with anything less than respect and satisfaction.

General Payments

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

**Payments by Company**
Janssen Pharmaceuticals, Inc	$2,654 INVOKANA $1,562	XARELTO $1,087	$6
Novo Nordisk Inc	$2,171 Victoza $443	Ozempic $331	Tresiba $313	Saxenda $248	Xultophy 100/3.6 $172	Other $665
Boehringer Ingelheim Pharmaceuticals, Inc.	$1,877 GLYXAMBI $766	JARDIANCE $444	SPIRIVA RESPIMAT $348	STIOLTO $112	TRADJENTA $45	Other $164
AstraZeneca Pharmaceuticals LP	$1,628 SYMBICORT $395	BYDUREON $384	FARXIGA $274	BREZTRI $136	MOVANTIK $89	Other $351
GlaxoSmithKline, LLC.	$1,081 BREO $260	TANZEUM $222	ANORO $174	TRELEGY ELLIPTA $162	ANORO ELLIPTA $98	Other $166
Other	$8,981 VRAYLAR $885	ENTRESTO $486	ELIQUIS $375	Brintellix $367	Contrave $364	Other $6,504

**Types of Payments**
Food and Beverage	$17,665
Education	$728

Biography

Dr. Corey Warner obtained a license to practice in California.

Select Year:

Dr. Corey M. Warner, 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. Corey M. Warner, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2016

Medicare Procedure and Patient Information

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Corey M. Warner, MD in 2021

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2021

Average Medicare Patient Data From 2012 - 2021

Average of Total of Conditions of Medicare patients treated by Dr. Corey M. Warner, MD From 2012 - 2021

Education & Training

Insurance Information

Ratings & Reviews

General Payments

Biography

Other Providers in Clearlake, CA