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Dr. Michael Z. Koontz, MD

(Dr. Michael Zach Koontz, MD)

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Specializes in: Medical Oncology and Internal Medicine (Adult Medicine)

University of California, Irvine, School of Medicine (2007)

5 Harris Court Building T 201
Monterey, CA 93940

(831) 375-4105

Dr. Michael Z. Koontz, MD is a medical oncologist in Monterey, CA specializing in medical oncology and internal medicine (adult medicine). He graduated from University of California, Irvine, School of Medicine in 2007 and has 19 years of experience. Dr. Michael Z. Koontz, MD is affiliated with MONTEREY BAY ONCOLOGY A MEDICAL CORPORATION.

Office Locations

5 Harris Court Building T 201
Monterey, CA 93940

(831) 375-4105

(831) 655-1277

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In The News

“Doug and Terri would like to thank Dr. M. Zach Koontz, Dharma Naidu, PharmD and the many dedicated nurses at Pacific Cancer Care, as well as Rn Desiree from VNA Monterey for all their heartfelt...”—"Douglas Charles Holley", Mercury News, October 2017

“Charlie's family is grateful for the excellent care he received from M. Zach Koontz, M.D. and the staff at the Pacific Cancer Care Treatment Center and from Patrick E. Feehan, D.O., Margaret...”—"Charles William Brown", Monterey Herald, November 2016

Noteworthy Medicare Patient Procedures Performed by Dr. Michael Z. Koontz, MD in 2023

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

Top 5%

By Affordability:

antigen tests

In 2023, Dr. Michael Z. Koontz, MD had a list price for antigen tests that was lower than the list prices billed to Medicare by 95% of providers in related specialties within California. 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:

prostate-specific antigen test

total PSA test

In 2023, Dr. Michael Z. Koontz, MD had a list price for prostate-specific antigen (PSA) test, and total PSA test that was lower than the list prices billed to Medicare by 90% of providers in related specialties within California. 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:

antineoplastic hormone therapy

biological response modifier therapy

blood draw

complete blood count

intravenous chemotherapy

intravenous infusion

phlebotomy for lab tests

By Affordability:

antineoplastic hormone therapy

hormone therapy

intravenous infusion therapy

In 2012, among providers in related specialties within California, Dr. Michael Z. Koontz, MD performed more antineoplastic hormone therapy, biological response modifier (BRM) therapy, blood draw, complete blood count (CBC), intravenous (IV) chemotherapy, intravenous (IV) infusion, and phlebotomy for lab tests procedures for Medicare patients than 75% of them and he also had a list price for antineoplastic hormone therapy, hormone therapy, intravenous infusion therapy, intravenous (IV) infusion, metabolic panel, port flush, and urine tests 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

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

doctor visit	24

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Michael Z. Koontz, MD treated as a medical oncologist in Monterey, CA during 2013 were hospital care and inpatient care.

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

doctor visit	298
hospital care	472
inpatient care	472

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael Z. Koontz, MD.

**Gender**
Male	104
Female	71

**Ethnicity**
Non-Hispanic White	108
Black	0
Hispanic	20
Asian	36
Other	0
Native American	0

**Age**
From 65 to 74	85
From 75 to 84	58
85 and over	13
Less than 65	19

Conditions of Medicare patients treated by Dr. Michael Z. Koontz, MD in 2013

Hypertension	71
High Cholesterol	50
Stroke	6
Ischemic Heart Disease	34
Depression	26
Chronic Kidney Disease	41
Asthma	10
Osteoperosis	9
Atrial Fibrilation	14
Heart Failure	21
Chronic Obstructive Pulmonary Disease	12
Diabetes	37
Dementia	0
Cancer	32

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Michael Z. Koontz, MD treated as a medical oncologist in Monterey, CA during 2014 were blood draw, lab tests, hospital care and inpatient care.

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

biological response modifier (BRM) therapy	233
blood draw	397
chemotherapy	233
doctor visit	825
hospital care	311
inpatient care	311
lab tests	362
minimally invasive procedures	258

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael Z. Koontz, MD.

**Gender**
Male	195
Female	233

**Ethnicity**
Non-Hispanic White	311
Black	22
Hispanic	32
Asian	48
Other	0
Native American	0

**Age**
From 65 to 74	188
From 75 to 84	143
85 and over	56
Less than 65	41

Conditions of Medicare patients treated by Dr. Michael Z. Koontz, MD in 2014

Hypertension	65
High Cholesterol	52
Stroke	5
Ischemic Heart Disease	30
Depression	18
Chronic Kidney Disease	36
Asthma	9
Osteoperosis	10
Atrial Fibrilation	13
Heart Failure	15
Chronic Obstructive Pulmonary Disease	13
Diabetes	30
Dementia	7
Cancer	41

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Michael Z. Koontz, MD treated as a medical oncologist in Monterey, CA during 2015 were blood draw, lab tests, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

aspiration	12
biological response modifier (BRM) therapy	429
blood draw	937
bone marrow tests	24
chemotherapy	429
diagnostic procedures	24
doctor visit	1718
hormone therapy	46
hospital care	336
inpatient care	336
lab tests	823
minimally invasive procedures	513
port flush	93
preventive care	19
vaccines	19

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael Z. Koontz, MD.

**Gender**
Male	494
Female	590

**Ethnicity**
Non-Hispanic White	822
Black	54
Hispanic	102
Asian	78
Other	0
Native American	0

**Age**
From 65 to 74	466
From 75 to 84	374
85 and over	170
Less than 65	74

Conditions of Medicare patients treated by Dr. Michael Z. Koontz, MD in 2015

Hypertension	60
High Cholesterol	53
Stroke	5
Ischemic Heart Disease	33
Depression	20
Chronic Kidney Disease	36
Asthma	11
Osteoperosis	12
Atrial Fibrilation	15
Heart Failure	16
Chronic Obstructive Pulmonary Disease	14
Diabetes	27
Dementia	9
Cancer	40

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Michael Z. Koontz, MD treated as a medical oncologist in Monterey, CA during 2016 were blood draw, lab tests, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

biological response modifier (BRM) therapy	458
blood draw	1095
chemotherapy	458
doctor visit	2045
hormone therapy	61
hospital care	429
inpatient care	429
lab tests	981
minimally invasive procedures	566
port flush	107
preventive care	31
vaccines	31

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael Z. Koontz, MD.

**Gender**
Male	300
Female	407

**Ethnicity**
Non-Hispanic White	524
Black	33
Hispanic	75
Asian	54
Other	0
Native American	0

**Age**
From 65 to 74	305
From 75 to 84	238
85 and over	118
Less than 65	46

Conditions of Medicare patients treated by Dr. Michael Z. Koontz, MD in 2016

Hypertension	65
High Cholesterol	57
Stroke	4
Ischemic Heart Disease	33
Depression	20
Chronic Kidney Disease	40
Asthma	20
Osteoperosis	14
Atrial Fibrilation	15
Heart Failure	17
Chronic Obstructive Pulmonary Disease	17
Diabetes	30
Dementia	11
Cancer	42

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Michael Z. Koontz, MD treated as a medical oncologist in Monterey, CA during 2017 were blood draw, lab tests, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

aspiration	13
biological response modifier (BRM) therapy	586
blood draw	1507
bone marrow tests	26
chemotherapy	586
diagnostic procedures	26
doctor visit	2664
hormone therapy	70
hospital care	424
inpatient care	424
lab tests	1323
minimally invasive procedures	640
port flush	69
preventive care	45
vaccines	45

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael Z. Koontz, MD.

**Gender**
Male	385
Female	476

**Ethnicity**
Non-Hispanic White	643
Black	34
Hispanic	91
Asian	64
Other	0
Native American	0

**Age**
From 65 to 74	358
From 75 to 84	274
85 and over	164
Less than 65	65

Conditions of Medicare patients treated by Dr. Michael Z. Koontz, MD in 2017

Hypertension	64
High Cholesterol	50
Stroke	3
Ischemic Heart Disease	37
Depression	18
Chronic Kidney Disease	36
Asthma	8
Osteoperosis	16
Atrial Fibrilation	16
Heart Failure	16
Chronic Obstructive Pulmonary Disease	15
Diabetes	25
Dementia	11
Cancer	42

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Michael Z. Koontz, MD treated as a medical oncologist in Monterey, CA during 2018 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

biological response modifier (BRM) therapy	821
blood draw	1853
chemotherapy	821
doctor visit	3391
hormone therapy	115
hospital care	407
inpatient care	407
lab tests	2256
minimally invasive procedures	839
port flush	109
preventive care	73
vaccines	73

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael Z. Koontz, MD.

**Gender**
Male	443
Female	573

**Ethnicity**
Non-Hispanic White	776
Black	44
Hispanic	102
Asian	59
Other	0
Native American	0

**Age**
From 65 to 74	387
From 75 to 84	357
85 and over	200
Less than 65	72

Conditions of Medicare patients treated by Dr. Michael Z. Koontz, MD in 2018

Hypertension	65
High Cholesterol	61
Stroke	4
Ischemic Heart Disease	38
Depression	17
Chronic Kidney Disease	37
Asthma	7
Osteoperosis	18
Atrial Fibrilation	14
Heart Failure	18
Chronic Obstructive Pulmonary Disease	14
Diabetes	26
Dementia	12
Cancer	42

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Michael Z. Koontz, MD treated as a medical oncologist in Monterey, CA during 2019 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

biological response modifier (BRM) therapy	1023
blood draw	2194
chemotherapy	1023
doctor visit	3640
hormone therapy	131
hospital care	537
inpatient care	537
lab tests	5057
minimally invasive procedures	1187
port flush	70
preventive care	40
thyroid function tests	183
vaccines	40

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael Z. Koontz, MD.

**Gender**
Male	489
Female	637

**Ethnicity**
Non-Hispanic White	854
Black	0
Hispanic	111
Asian	70
Other	46
Native American	0

**Age**
From 65 to 74	448
From 75 to 84	397
85 and over	214
Less than 65	67

Conditions of Medicare patients treated by Dr. Michael Z. Koontz, MD in 2019

Hypertension	65
High Cholesterol	62
Stroke	5
Ischemic Heart Disease	39
Depression	17
Chronic Kidney Disease	39
Asthma	6
Osteoperosis	18
Atrial Fibrilation	13
Heart Failure	17
Chronic Obstructive Pulmonary Disease	15
Diabetes	26
Dementia	12
Cancer	40

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Michael Z. Koontz, MD treated as a medical oncologist in Monterey, CA during 2020 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

biological response modifier (BRM) therapy	772
blood draw	1570
chemotherapy	772
chronic care	79
doctor visit	2532
hormone therapy	90
hospital care	351
inpatient care	351
lab tests	3987
minimally invasive procedures	925
port flush	55
thyroid function tests	213

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael Z. Koontz, MD.

**Gender**
Male	440
Female	511

**Ethnicity**
Non-Hispanic White	731
Black	42
Hispanic	86
Asian	56
Other	0
Native American	0

**Age**
From 65 to 74	388
From 75 to 84	337
85 and over	169
Less than 65	57

Conditions of Medicare patients treated by Dr. Michael Z. Koontz, MD in 2020

Hypertension	64
High Cholesterol	60
Stroke	3
Ischemic Heart Disease	39
Depression	17
Chronic Kidney Disease	40
Asthma	7
Osteoperosis	16
Atrial Fibrilation	13
Heart Failure	18
Chronic Obstructive Pulmonary Disease	16
Diabetes	27
Dementia	10
Cancer	44

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Michael Z. Koontz, MD treated as a medical oncologist in Monterey, CA during 2021 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

biological response modifier (BRM) therapy	464
blood draw	1406
chemotherapy	464
doctor visit	2275
hormone therapy	93
hospital care	351
inpatient care	351
lab tests	3528
minimally invasive procedures	547
port flush	29
thyroid function tests	181

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael Z. Koontz, MD.

**Gender**
Male	452
Female	515

**Ethnicity**
Non-Hispanic White	754
Black	0
Hispanic	82
Asian	53
Other	41
Native American	0

**Age**
From 65 to 74	385
From 75 to 84	375
85 and over	169
Less than 65	38

Conditions of Medicare patients treated by Dr. Michael Z. Koontz, MD in 2021

Hypertension	65
High Cholesterol	62
Stroke	3
Ischemic Heart Disease	41
Depression	18
Chronic Kidney Disease	39
Asthma	7
Osteoperosis	16
Atrial Fibrilation	14
Heart Failure	19
Chronic Obstructive Pulmonary Disease	14
Diabetes	27
Dementia	10
Cancer	44

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Michael Z. Koontz, MD treated as a medical oncologist in Monterey, CA during 2022 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

biological response modifier (BRM) therapy	449
blood draw	1210
chemotherapy	449
doctor visit	1824
hormone therapy	88
hospital care	227
inpatient care	227
lab tests	3022
minimally invasive procedures	528
port flush	40
thyroid function tests	138

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Michael Z. Koontz, MD.

**Gender**
Male	386
Female	440

**Ethnicity**
Non-Hispanic White	627
Black	0
Hispanic	70
Asian	54
Other	41
Native American	0

**Age**
From 65 to 74	311
From 75 to 84	335
85 and over	139
Less than 65	41

Conditions of Medicare patients treated by Dr. Michael Z. Koontz, MD in 2022

Hypertension	72
High Cholesterol	75
Stroke	7
Ischemic Heart Disease	35
Depression	16
Chronic Kidney Disease	27
Asthma	9
Osteoperosis	22
Atrial Fibrilation	20
Heart Failure	16
Chronic Obstructive Pulmonary Disease	17
Diabetes	27
Dementia	7
Cancer	50

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Michael Z. Koontz, MD for Medicare patients.

The highest averages for the top procedures that Dr. Michael Z. Koontz, MD treated as a medical oncologist in Monterey, CA were lab tests, blood draw, minimally invasive procedures and chemotherapy.

aspiration	12
biological response modifier (BRM) therapy	581
blood draw	1352
bone marrow tests	25
chemotherapy	581
chronic care	79
diagnostic procedures	25
doctor visit	1930
hormone therapy	86
hospital care	384
inpatient care	384
lab tests	2371
minimally invasive procedures	667
preventive care	41
thyroid function tests	178
vaccines	41

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Michael Z. Koontz, MD.

**Gender**
Male	335
Female	404

**Ethnicity**
Black / African American	20
Asian / Pacific Islander	52
Non-Hispanic White	559
Native American / Alaskan Native	0
Hispanic	70
Other	11

**Age**
75 to 84	262
85 and over	128
Less than 65	47
65 to 74	301

Average of Total of Conditions of Medicare patients treated by Dr. Michael Z. Koontz, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Michael Z. Koontz, MD treated were hypertension, high cholesterol, cancer and chronic kidney disease.

Hypertension	59
High Cholesterol	52
Stroke	4
Ischemic Heart Disease	32
Depression	17
Chronic Kidney Disease	33
Asthma	8
Osteoporosis	13
Heart Failure	15
Chronic Obstructive Pulmonary Disease	13
Diabetes	25
Atrial Fibrillation	13
Dementia	8
Cancer	37

Education & Training

Dr. Michael Z. Koontz, MD graduated from University of California, Irvine, School of Medicine in 2007. He has a state license in California.

Medical School: University of California, Irvine, School of Medicine (2007)

Licensed In: California

Affiliations & Hospitals

Dr. Michael Z. Koontz, MD is associated with these hospitals and organizations:

MONTEREY BAY ONCOLOGY A MEDICAL CORPORATION

Ratings & Reviews

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General Payments

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

**Payments by Company**
E.R. Squibb & Sons, L.L.C.	$268 OPDIVO $268
Pfizer Inc.	$242 XALKORI $126	IBRANCE $96	MYLOTARG $20
Alexion Pharmaceuticals, Inc.	$97 SOLIRIS $97
Exelixis Inc.	$64 Cabometyx $64
Celgene Corporation	$63 Revlimid $18	Abraxane $14	$30
Other	$640 ZEJULA $64	Alphanate $51	JAKAFI $48	FARYDAK $29	Vonjo $27	Other $421

**Types of Payments**
Food and Beverage	$1,069
Education	$305

Research Payments

Dr. Michael Z. Koontz, MD has received 109 research payments totaling $1,545,472.

Biography

Dr. Michael Koontz's area of specialization is medical oncology. He attended medical school at the University of California, Irvine, School of Medicine.