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Dr. John D. Oholleran, MD

(22 Ratings)

Specializes in: General Surgery

University of Nebraska College of Medicine (1987)

Professional interests include: partial splenectomy, muscle biopsy, laparoscopic splenectomy, and more.

1510 Division Street Suite 210
Oregon City, OR 97045

(503) 723-6525

Dr. John D. Oholleran, MD is a general surgeon in Oregon City, OR specializing in general surgery. He graduated from University of Nebraska College of Medicine in 1987 and has 39 years of experience. Dr. John D. Oholleran, MD is affiliated with Providence and Providence Willamette Falls Medical Center.

Office Locations

Providence Willamette Falls Medical Center

1510 Division Street Suite 210
Oregon City, OR 97045

(503) 723-6525

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Some issues Dr. John D. Oholleran, MD can help you with:

Biopsy

A biopsy is a procedure performed to remove a small sample of cells for testing. The cells are examined in a laboratory to check for disease, or sometimes to see how badly a known disease is affecting them. Biopsy can be performed on any part of the body.

Although biopsy is most often associated with cancer, it can also be used to check for other diseases, such as infections. A biopsy sample can be scraped, cut, collected with a needle, taken with a machine that punches out a tiny piece, or removed with the tiny tools in an endoscope.

In most cases, a biopsy is a simple outpatient procedure. Depending on the procedure, patients may need to stop taking certain medications beforehand, such as blood thinners. It is important for patients to tell doctors if they are pregnant, as certain biopsies require the use of x-rays to guide the needle to the right location. There is usually very little pain associated with a biopsy. Patients will have to wait a few days to hear the results.

Breast Biopsy

Breast biopsy is a procedure where a small sample of tissue is collected from the breast for testing. A physician may prescribe a breast biopsy for a variety of reasons, but they are most frequently prescribed for a lump found in the breast. Biopsy samples extracted are examined by pathologists in a laboratory setting and are tested to determine if they are cancerous or benign, or indicative of some other condition. Depending on the lab results, physicians may prescribe additional treatment. Other circumstances which may prompt a breast biopsy include:

Mammograms that detect other unusual features in the chest, such as a cyst or calcium deposit
Breast scans or ultrasounds that display abnormalities
Nipple changes, such as scaling, crusting, or bloody discharge

Breast biopsies are collected through several different procedures and the specific type of biopsy that a patient receives depends on the size, location, and features of a breast lump or irregularity. The three main methods of collecting a breast biopsy include:

Fine needle aspiration (FNA biopsy), where a thin needle is directed into a breast lump or abnormality, extracting a small sample of tissue or liquid
Core needle biopsy (CNB biopsy), where a hollow needle is directed into a breast lump or abnormality, extracting cylinders of tissue called "cores"
Open (surgical) biopsy, where a breast lump is removed through an incision in the breast

Fine needle aspiration (FNA) and core needle biopsy (CNB) are sometimes image-guided, where a mammogram, ultrasound, or MRI helps direct the physician performing the needle extraction.

Fine needle aspiration, the most common biopsy method, generally requires few patient preparations. It is recommended patients avoid using lotion, deodorant, and perfume prior to their biopsy procedure. FNA biopsy is performed with local anesthesia (topical numbing cream) and typically has a quick recovery, but patients may experience soreness for a few days. Core needle biopsy extracts slightly more tissue than an FNA biopsy.

Open (surgical) biopsy is more invasive and requires general anesthesia, where patients are put to sleep during the procedure. Patients must fast prior to the surgery. After the biopsy is performed, patients are monitored in a recovery room for a time before being discharged, when they will need someone else to provide transportation.

Although some may consider breast biopsy to be a simple procedure, it can catch critical issues - particularly breast cancer - that impact wellness. If a breast biopsy reveals an underlying condition like life-threatening cancer, patients can receive the diagnosis and medical treatment that is necessary for their long-term health.

Pancreatectomy (Pancreas Removal)

Pancreatectomy is surgery to remove part or all of the pancreas to treat pancreatitis, tumors, or cancer. The pancreas is located behind the stomach and near the small intestine and spleen. There are three sections of the pancreas:

The head, which is the portion closest to the intestines
The body, which is the middle portion of the pancreas
The tail, which is the portion nearest the spleen

Pancreas removal procedures differ based on how much of the pancreas and surrounding organs are removed. There are three types of pancreatectomy:

Distal pancreatectomy removes the tail and body of the pancreas. This procedure treats tumors confined to these areas.
Pancreaticoduodenectomy, or the Whipple procedure, removes the pancreas, duodenum, bile duct, and, sometimes, part of the stomach. The Whipple procedure is used for pancreatic tumors that have not spread past the head of the pancreas and for other conditions affecting the pancreas, duodenum, and bile duct.
Total pancreatectomy removes the whole pancreas along with the duodenum, gallbladder, parts of the stomach and bile duct, surrounding lymph nodes, and, potentially, the spleen. Rarely performed, total pancreatectomy treats conditions that involve the entire pancreas, such as tumors found in multiple sites on the pancreas, or for rare tumors such as intraductal papillary mucinous neoplasms (IPMN).

Pancreatectomy can be done by open or minimally invasive surgery. During a laparoscopic pancreatectomy, the surgeon will use tiny incisions to insert a thin tube with a camera, or laparoscope, into the abdomen. Open surgery, or a laparotomy, is performed through a larger incision on the abdomen. If additional organs are removed, some procedures may require that the small intestine be reconnected to the stomach.

The hospital for pancreatectomy stay may be between 1-3 weeks. Generally, laparoscopic surgeries require shorter recovery periods. Whether patients undergo an open or laparoscopic procedure is determined by factors such as their condition and the extent of their procedure. For example, open surgery tends to be more common for distal pancreatectomies. If patients have difficulty eating, they may require a nasogastric tube, inserted through the nose, to carry food to their stomachs. A catheter can be inserted into the bladder if patients have trouble urinating. Full recovery may take about two months.

Noteworthy Medicare Patient Procedures Performed by Dr. John D. Oholleran, MD 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

By Affordability:

hospital care

inpatient care

inpatient hospital care

In 2012, among providers in related specialties within Oregon, Dr. John D. Oholleran, MD 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. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR during 2012 were hospital care, inpatient care and catheterization.

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

catheterization	11
doctor visit	348
hospital care	217
inpatient care	217

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR during 2013 were hospital care and inpatient care.

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

doctor visit	337
hospital care	157
inpatient care	157

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John D. Oholleran, MD.

**Gender**
Male	94
Female	141

**Ethnicity**
Non-Hispanic White	190
Black	0
Hispanic	26
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	100
From 75 to 84	64
85 and over	52
Less than 65	19

Conditions of Medicare patients treated by Dr. John D. Oholleran, MD in 2013

Hypertension	69
High Cholesterol	63
Stroke	0
Ischemic Heart Disease	31
Depression	17
Chronic Kidney Disease	27
Asthma	12
Osteoperosis	16
Atrial Fibrilation	17
Heart Failure	26
Chronic Obstructive Pulmonary Disease	17
Diabetes	29
Dementia	8
Cancer	27

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR during 2014 were hospital care and inpatient care.

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

doctor visit	320
hospital care	98
inpatient care	98

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John D. Oholleran, MD.

**Gender**
Male	95
Female	158

**Ethnicity**
Non-Hispanic White	206
Black	0
Hispanic	22
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	102
From 75 to 84	82
85 and over	57
Less than 65	12

Conditions of Medicare patients treated by Dr. John D. Oholleran, MD in 2014

Hypertension	74
High Cholesterol	65
Stroke	0
Ischemic Heart Disease	32
Depression	16
Chronic Kidney Disease	34
Asthma	6
Osteoperosis	13
Atrial Fibrilation	16
Heart Failure	24
Chronic Obstructive Pulmonary Disease	13
Diabetes	28
Dementia	8
Cancer	21

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR during 2015 were hospital care and inpatient care.

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

doctor visit	286
hospital care	150
inpatient care	150

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John D. Oholleran, MD.

**Gender**
Male	198
Female	272

**Ethnicity**
Non-Hispanic White	390
Black	0
Hispanic	34
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	176
From 75 to 84	160
85 and over	112
Less than 65	22

Conditions of Medicare patients treated by Dr. John D. Oholleran, MD in 2015

Hypertension	73
High Cholesterol	63
Stroke	0
Ischemic Heart Disease	34
Depression	19
Chronic Kidney Disease	33
Asthma	12
Osteoperosis	12
Atrial Fibrilation	21
Heart Failure	28
Chronic Obstructive Pulmonary Disease	15
Diabetes	32
Dementia	9
Cancer	25

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR during 2016 were hospital care and inpatient care.

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

doctor visit	304
hospital care	171
inpatient care	171

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John D. Oholleran, MD.

**Gender**
Male	103
Female	134

**Ethnicity**
Non-Hispanic White	206
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	86
From 75 to 84	81
85 and over	53
Less than 65	17

Conditions of Medicare patients treated by Dr. John D. Oholleran, MD in 2016

Hypertension	74
High Cholesterol	58
Stroke	7
Ischemic Heart Disease	31
Depression	22
Chronic Kidney Disease	36
Asthma	22
Osteoperosis	14
Atrial Fibrilation	17
Heart Failure	22
Chronic Obstructive Pulmonary Disease	19
Diabetes	28
Dementia	11
Cancer	29

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR during 2017 were hospital care and inpatient care.

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

doctor visit	276
hospital care	167
inpatient care	167

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John D. Oholleran, MD.

**Gender**
Male	101
Female	131

**Ethnicity**
Non-Hispanic White	199
Black	0
Hispanic	14
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	96
From 75 to 84	82
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John D. Oholleran, MD in 2017

Hypertension	72
High Cholesterol	60
Stroke	6
Ischemic Heart Disease	32
Depression	16
Chronic Kidney Disease	35
Asthma	11
Osteoperosis	14
Atrial Fibrilation	16
Heart Failure	21
Chronic Obstructive Pulmonary Disease	19
Diabetes	28
Dementia	8
Cancer	30

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR during 2018 were hospital care and inpatient care.

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

doctor visit	288
hospital care	134
inpatient care	134

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John D. Oholleran, MD.

**Gender**
Male	99
Female	133

**Ethnicity**
Non-Hispanic White	186
Black	0
Hispanic	17
Asian	14
Other	0
Native American	0

**Age**
From 65 to 74	77
From 75 to 84	91
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John D. Oholleran, MD in 2018

Hypertension	74
High Cholesterol	67
Stroke	6
Ischemic Heart Disease	33
Depression	17
Chronic Kidney Disease	33
Asthma	13
Osteoperosis	13
Atrial Fibrilation	17
Heart Failure	23
Chronic Obstructive Pulmonary Disease	18
Diabetes	25
Dementia	9
Cancer	31

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR during 2019 were hospital care and inpatient care.

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

doctor visit	183
hospital care	104
inpatient care	104

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John D. Oholleran, MD.

**Gender**
Male	94
Female	93

**Ethnicity**
Non-Hispanic White	156
Black	0
Hispanic	0
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	78
From 75 to 84	61
85 and over	37
Less than 65	11

Conditions of Medicare patients treated by Dr. John D. Oholleran, MD in 2019

Hypertension	75
High Cholesterol	70
Stroke	0
Ischemic Heart Disease	39
Depression	21
Chronic Kidney Disease	29
Asthma	11
Osteoperosis	11
Atrial Fibrilation	16
Heart Failure	28
Chronic Obstructive Pulmonary Disease	14
Diabetes	29
Dementia	12
Cancer	25

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR during 2020 were debridement (removal of unhealthy tissue), excision, hospital care and inpatient care.

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

debridement (removal of unhealthy tissue)	57
doctor visit	73
excision	57
hospital care	56
inpatient care	56

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John D. Oholleran, MD.

**Gender**
Male	73
Female	53

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

**Age**
From 65 to 74	45
From 75 to 84	37
85 and over	18
Less than 65	26

Conditions of Medicare patients treated by Dr. John D. Oholleran, MD in 2020

Hypertension	75
High Cholesterol	68
Stroke	0
Ischemic Heart Disease	49
Depression	31
Chronic Kidney Disease	47
Asthma	0
Osteoperosis	9
Atrial Fibrilation	19
Heart Failure	31
Chronic Obstructive Pulmonary Disease	29
Diabetes	38
Dementia	16
Cancer	11

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR during 2021 were debridement (removal of unhealthy tissue), excision, hospital care and inpatient care.

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

debridement (removal of unhealthy tissue)	147
doctor visit	133
excision	147
hospital care	99
inpatient care	99

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John D. Oholleran, MD.

**Gender**
Male	86
Female	73

**Ethnicity**
Non-Hispanic White	143
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	56
From 75 to 84	50
85 and over	27
Less than 65	26

Conditions of Medicare patients treated by Dr. John D. Oholleran, MD in 2021

Hypertension	75
High Cholesterol	69
Stroke	0
Ischemic Heart Disease	48
Depression	25
Chronic Kidney Disease	47
Asthma	12
Osteoperosis	13
Atrial Fibrilation	17
Heart Failure	27
Chronic Obstructive Pulmonary Disease	30
Diabetes	35
Dementia	14
Cancer	9

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR during 2022 were hospital care and inpatient care.

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

hospital care	12
inpatient care	12

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John D. Oholleran, MD.

**Gender**
Male	29
Female	16

**Age**
From 65 to 74	22
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John D. Oholleran, MD in 2022

Hypertension	69
High Cholesterol	64
Stroke	0
Ischemic Heart Disease	33
Depression	24
Chronic Kidney Disease	31
Asthma	0
Osteoperosis	0
Atrial Fibrilation	27
Heart Failure	31
Chronic Obstructive Pulmonary Disease	36
Diabetes	31
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. John D. Oholleran, MD for Medicare patients.

The highest averages for the top procedures that Dr. John D. Oholleran, MD treated as a general surgeon in Oregon City, OR were hospital care, inpatient care, debridement (removal of unhealthy tissue) and excision.

catheterization	11
debridement (removal of unhealthy tissue)	102
doctor visit	254
excision	102
hospital care	124
inpatient care	124

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John D. Oholleran, MD.

**Gender**
Male	88
Female	109

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	1
Non-Hispanic White	162
Native American / Alaskan Native	0
Hispanic	10
Other	1

**Age**
75 to 84	64
85 and over	32
Less than 65	12
65 to 74	76

Average of Total of Conditions of Medicare patients treated by Dr. John D. Oholleran, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. John D. Oholleran, MD treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension	66
High Cholesterol	58
Stroke	1
Ischemic Heart Disease	32
Depression	18
Chronic Kidney Disease	32
Asthma	9
Osteoporosis	10
Heart Failure	23
Chronic Obstructive Pulmonary Disease	19
Diabetes	27
Atrial Fibrillation	16
Cancer	18
Dementia	8

Education & Training

Dr. John D. Oholleran, MD graduated from University of Nebraska College of Medicine in 1987. He completed residency at Exempla Saint Joseph Hospital, Denver. He is certified by the American Board of Surgery, Surgery (General Surgery) and has a state license in Illinois.

Medical School: University of Nebraska College of Medicine (1987)

Residency: Exempla Saint Joseph Hospital, Denver (1992)

Board Certification: American Board of Surgery, Surgery (General Surgery)

Licensed In: Illinois

Affiliations & Hospitals

Dr. John D. Oholleran, MD is associated with these hospitals and organizations:

Providence

Providence Willamette Falls Medical Center

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. John D. Oholleran, MD appears to accept the following insurance providers: First Choice Health, TRICARE Prime, TRICARE For Life, CIGNA PPO, CIGNA Open Access Plus, United Healthcare, TRICARE, Medicaid, Blue California, CHAMPVA, United Healthcare PPO, United Healthcare POS, Providence, Regence, US Family Health Plan, Medicare AB, Aetna PROV Employee POS, Moda Connexus Network, Age Right Marquis Advantage and Samaritan Health Plan Med Advantage.

Insurance Accepted by Provider includes:

According to our sources, Dr. John D. Oholleran, MD accepts the following insurance providers:

First Choice Health

TRICARE Prime

TRICARE For Life

CIGNA PPO

CIGNA Open Access Plus

United Healthcare

TRICARE

Medicaid

Blue California

CHAMPVA

United Healthcare PPO

United Healthcare POS

Providence

Regence

US Family Health Plan

Medicare AB

Aetna PROV Employee POS

Moda Connexus Network

Age Right Marquis Advantage

Samaritan Health Plan Med Advantage

Ratings & Reviews

Dr. John D. Oholleran, MD has an exceptional overall rating with an average of 5.0 out of 5 stars based on 22 ratings. We collect ratings and reviews of Dr. John D. Oholleran, MD from all over the web to help you find the right in Oregon City, OR.

Overall Rating

(22 Ratings)

Leave a Review

Reviews Left On DocSpot

Overall Rating: 5.0 2017-03-20

Dr. O'Holleran was recommended to us by our trusted primary care doctor when my wife was diagnosed with breast cancer, and we were getting LOTS of unsolicited advice from people about the doctors we "must see". It was scary and overwhelming, and we had no idea how to choose... until our primary care doc was firm about who he'd see. She is 10 years cancer free this year, and Dr. O has continued to be our go-to with some of the surgeries that followed given her specific situation. We are very grateful to have him and his commitment to us.

General Payments

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

**Payments by Company**
Intuitive Surgical, Inc.	$3,964 Da Vinci Surgical System $3,964
Novadaq Technologies Inc.	$3,840 DERMACELL $1,919	LUNA $1,742	PINPOINT $179
Davol Inc.	$1,860 3DMAX $1,601	DAV-OptiFixTM $127	PHASIX $75	$57
KCI USA, Inc	$800 VAC THERAPY $800
Stryker Corporation	$550 New Product Development $550
Other	$1,210 Sports Med Coblation & Fixation $420	PHASIX $369	ENTEREG $145	OviTex Reinforced Bioscaffold With Permanent Polymer (OviTex) $144	ENT Coblation, RR & Sinus $105	Other $26

**Types of Payments**
Travel and Lodging	$7,622
Food and Beverage	$3,253
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$1,350

Biography

Dr. John Oholleran specializes in general surgery. Clinical interests for Dr. Oholleran include laparoscopic gastrostomy, fine needle aspiration (FNA), and pancreatectomy (pancreas removal). He is professionally affiliated with Providence Willamette Falls Medical Center. Before completing his residency at Exempla Saint Joseph Hospital, Denver, Dr. Oholleran attended medical school at the University of Nebraska College of Medicine. He has a 5.0 out of 5 star average patient rating. Dr. Oholleran is in-network for several insurance carriers, including Regence, Blue California, and United Healthcare POS.