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Dr. Mary Ellen Mahoney, MD

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Specializes in: General Practice and Surgery

Professional interests include: breast cancer screening, galactocele (milk-filled cyst), galactorrhea (nipple discharge), and more.

636 Harris Street
Eureka, CA 95503

(707) 476-0688

Dr. Mary Ellen Mahoney, MD is a general practitioner in Eureka, CA specializing in general practice and surgery. Dr. Mary Ellen Mahoney, MD is affiliated with Providence and Providence St. Joseph Hospital -Eureka.

Office Locations

Providence St. Joseph Hospital -Eureka

636 Harris Street
Eureka, CA 95503

(707) 476-0688

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Some issues Dr. Mary Ellen Mahoney, MD can help you with:

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.

Mastectomy (Breast Removal Surgery)

Mastectomy is the surgical removal of all or part of the breasts, most frequently associated with breast cancer treatment (for both male and female breast cancer patients). Breast cancer patients who receive a mastectomy typically have undergone other treatments, such as chemotherapy, radiation, and less invasive breast-conserving surgery (lumpectomy). If these treatments are unsuccessful, oncologists may eventually prescribe a mastectomy. Other conditions that may prompt a mastectomy include:

Two or more cancerous regions in the same breast
Inability to receive chemotherapy or radiation therapy
High likelihood of recurring breast cancer
Large tumor that is bigger than two inches across
Pregnancy that prohibits radiation therapy
Preexisting conditions like lupus or scleroderma

Notably, some patients may elect to undergo mastectomy without a breast cancer diagnosis. Preventative (prophylactic) mastectomy is performed on those with a high risk of breast cancer, such as having a family history of the disease or carrying the breast cancer BRCA1 or BRCA2 gene. Preventative mastectomy substantially reduces one's chances of developing breast cancer in the future, but it cannot wholly prevent it.

Surgical oncologists perform several types of mastectomies, depending upon the severity of the breast cancer (including factors such as its location and spread), as well as the patients' own aesthetic and personal choices. The six main types of mastectomy include:

Total mastectomy, where the surgical oncologist removes an entire breast, including parts like the pectoral chest muscle, skin, and nipple.
Radical mastectomy, where the surgical oncologist removes the entire breast, underarm lymph nodes, pectoral chest muscles, and outer skin and nipple. One of the most invasive forms of mastectomy, radical mastectomy is infrequently performed.
Modified radical mastectomy, where the surgical oncologist completes a total mastectomy and also removes the underarm lymph nodes. This procedure is slightly less invasive than radical mastectomy.
Skin-sparing mastectomy, where the surgical oncologist removes cancerous breast tissue and nipple, but leaves most of breast skin. This method is used in conjunction with breast reconstruction, as implants can be added below the skin. Skin-sparing mastectomy often requires a treatment team with a surgical oncologist and a plastic surgeon experienced in breast procedures.
Nipple-sparing mastectomy, where the surgical oncologist removes cancerous breast tissue and leaves the nipple and most of the breast skin. This method is only available to patients in the early stages of breast cancer. Similar to skin-sparing mastectomy, this procedure is frequently performed with breast reconstruction.

Any of these procedures can be done on both breasts, in which case the procedure would be known as a double mastectomy. For example, a surgical oncologist might perform a total or nipple-sparing mastectomy on both breasts. Double mastectomies are often used as a preventive surgery for those who are at risk of developing breast cancer later on in life.

Patients have one or two days of hospital stay before returning home from their mastectomy procedures. Full recovery can take several months, but some patients find they are able to resume normal activity within one month of their mastectomy. Patients are advised to limit arm and chest movements whenever possible.

After surgery, patients must also adjust to changes in their appearance. While some patients choose to receive breast reconstruction, other patients may decide to wear prosthetic breasts or will simply embrace their new chest.

Mastectomies permit patients to conquer cancer and lead healthy, thriving lives as breast cancer survivors.

In The News

“Although most specialists queried by the Chronicle were skeptical that a woman could be riding horseback one day and dead of cancer the next, Dr. Mary Ellen Mahoney, a breast cancer surgeon at...”—"Most Breast Cancer Deaths Not as Swift as McCartney's / Patients disturbed that diet, wealth couldn't save her", SFGATE, February 2012

Noteworthy Medicare Patient Procedures Performed by Dr. Mary Ellen Mahoney, MD in 2023

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

Top 5%

By Volume:

axillary lymph node dissection

In 2023, Dr. Mary Ellen Mahoney, MD performed more axillary lymph node dissection (ALND) procedures for Medicare patients than 95% of providers in related specialties within California.

Top 25%

By Volume:

lymph node procedures

In 2012, Dr. Mary Ellen Mahoney, MD performed more lymph node procedures procedures for Medicare patients than 75% of providers in related specialties within California.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA during 2012 were excision, lymph node procedures, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

breast procedures	29
cancer surgery	29
diagnostic procedures	24
doctor visit	173
excision	53
lymph node procedures	48
open surgery	24

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA during 2013 were excision, lymph node procedures, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

breast procedures	23
cancer surgery	23
diagnostic procedures	14
doctor visit	157
excision	37
lymph node procedures	31
open surgery	14

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mary Ellen Mahoney, MD.

**Ethnicity**
Non-Hispanic White	116
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	61
From 75 to 84	41
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mary Ellen Mahoney, MD in 2013

Hypertension	49
High Cholesterol	34
Stroke	0
Ischemic Heart Disease	16
Depression	26
Chronic Kidney Disease	9
Asthma	0
Osteoperosis	0
Atrial Fibrilation	9
Heart Failure	13
Chronic Obstructive Pulmonary Disease	0
Diabetes	19
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA during 2014 were lymph node procedures, breast procedures, cancer surgery and excision.

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

breast procedures	12
cancer surgery	12
doctor visit	138
excision	12
lymph node procedures	22

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mary Ellen Mahoney, MD.

**Age**
From 65 to 74	55
From 75 to 84	28
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mary Ellen Mahoney, MD in 2014

Hypertension	49
High Cholesterol	31
Stroke	0
Ischemic Heart Disease	12
Depression	22
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	12
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	19
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA during 2015 were lymph node procedures, dissection, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

breast procedures	15
cancer surgery	15
dissection	15
excision	15
lymph node procedures	42

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mary Ellen Mahoney, MD.

**Gender**
Male	0
Female	100

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

Conditions of Medicare patients treated by Dr. Mary Ellen Mahoney, MD in 2015

Hypertension	50
High Cholesterol	40
Stroke	0
Ischemic Heart Disease	0
Depression	32
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA during 2016 were lymph node procedures, dissection, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

breast procedures	12
cancer surgery	12
dissection	12
doctor visit	24
excision	12
lymph node procedures	30

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mary Ellen Mahoney, MD.

**Gender**
Male	0
Female	49

**Age**
From 65 to 74	26
From 75 to 84	11
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mary Ellen Mahoney, MD in 2016

Hypertension	53
High Cholesterol	33
Stroke	0
Ischemic Heart Disease	0
Depression	0
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	22
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA during 2017 were lymph node procedures, excision, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

breast procedures	18
cancer surgery	18
diagnostic procedures	11
doctor visit	141
excision	29
lymph node procedures	33
open surgery	11

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mary Ellen Mahoney, MD.

**Ethnicity**
Non-Hispanic White	97
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	59
From 75 to 84	26
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mary Ellen Mahoney, MD in 2017

Hypertension	53
High Cholesterol	34
Stroke	0
Ischemic Heart Disease	16
Depression	23
Chronic Kidney Disease	17
Asthma	0
Osteoperosis	14
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	17
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA during 2018 were lymph node procedures, excision, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

breast procedures	31
cancer surgery	31
diagnostic procedures	19
dissection	16
doctor visit	97
excision	50
lymph node procedures	60
open surgery	19

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mary Ellen Mahoney, MD.

**Ethnicity**
Non-Hispanic White	81
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	53
From 75 to 84	26
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mary Ellen Mahoney, MD in 2018

Hypertension	48
High Cholesterol	33
Stroke	0
Ischemic Heart Disease	20
Depression	22
Chronic Kidney Disease	21
Asthma	0
Osteoperosis	14
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	15
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA during 2019 were lymph node procedures, breast procedures, cancer surgery and excision.

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

breast procedures	12
cancer surgery	12
doctor visit	72
excision	12
lymph node procedures	13

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mary Ellen Mahoney, MD.

**Age**
From 65 to 74	32
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mary Ellen Mahoney, MD in 2019

Hypertension	49
High Cholesterol	25
Stroke	0
Ischemic Heart Disease	19
Depression	24
Chronic Kidney Disease	25
Asthma	0
Osteoperosis	19
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	22
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA during 2020 were breast procedures, lymph node procedures, excision and reconstructive surgery.

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

breast procedures	41
cancer surgery	15
diagnostic procedures	13
doctor visit	79
excision	28
lymph node procedures	36
open surgery	13
plastic surgery procedures	26
reconstructive surgery	26

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mary Ellen Mahoney, MD.

**Gender**
Male	0
Female	71

**Age**
From 65 to 74	37
From 75 to 84	22
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mary Ellen Mahoney, MD in 2020

Hypertension	45
High Cholesterol	30
Stroke	0
Ischemic Heart Disease	0
Depression	27
Chronic Kidney Disease	25
Asthma	0
Osteoperosis	25
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	23
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA during 2021 were breast procedures, cancer surgery, excision and lymph node procedures.

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

breast procedures	15
cancer surgery	15
doctor visit	70
excision	15
lymph node procedures	12

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mary Ellen Mahoney, MD.

**Age**
From 65 to 74	37
From 75 to 84	22
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mary Ellen Mahoney, MD in 2021

Hypertension	47
High Cholesterol	29
Stroke	0
Ischemic Heart Disease	0
Depression	26
Chronic Kidney Disease	24
Asthma	0
Osteoperosis	17
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	21
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA during 2022 were lymph node procedures, excision, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

breast procedures	35
cancer surgery	35
diagnostic procedures	13
dissection	17
doctor visit	101
excision	48
lymph node procedures	57
open surgery	13

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mary Ellen Mahoney, MD.

**Age**
From 65 to 74	42
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mary Ellen Mahoney, MD in 2022

Hypertension	68
High Cholesterol	64
Stroke	0
Ischemic Heart Disease	0
Depression	25
Chronic Kidney Disease	0
Asthma	14
Osteoperosis	28
Atrial Fibrilation	15
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	26
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Mary Ellen Mahoney, MD for Medicare patients.

The highest averages for the top procedures that Dr. Mary Ellen Mahoney, MD treated as a general practitioner in Eureka, CA were lymph node procedures, excision, reconstructive surgery and plastic surgery procedures.

breast procedures	22
cancer surgery	19
diagnostic procedures	15
dissection	15
doctor visit	105
excision	28
lymph node procedures	34
open surgery	15
plastic surgery procedures	26
reconstructive surgery	26

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Mary Ellen Mahoney, MD.

**Gender**
Female	20
Male	0

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	26
Hispanic	0
Native American / Alaskan Native	0
Other	0

**Age**
85 and over	0
75 to 84	16
Less than 65	0
65 to 74	42

Average of Total of Conditions of Medicare patients treated by Dr. Mary Ellen Mahoney, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Mary Ellen Mahoney, MD treated were cancer, hypertension, high cholesterol and depression.

Hypertension	46
High Cholesterol	32
Stroke	0
Ischemic Heart Disease	7
Depression	20
Chronic Kidney Disease	11
Asthma	1
Osteoporosis	11
Heart Failure	3
Chronic Obstructive Pulmonary Disease	0
Diabetes	14
Atrial Fibrillation	2
Dementia	0
Cancer	68

Education & Training

She has a state license in California.

Licensed In: California

Affiliations & Hospitals

Dr. Mary Ellen Mahoney, MD is associated with these hospitals and organizations:

Providence

Providence St. Joseph Hospital -Eureka

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General Payments

These charts describe general payments received by Dr. Mary Ellen Mahoney, 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.	$120 Pomalyst $91	OPDIVO $29
Merck Sharp & Dohme LLC	$115 KEYTRUDA $115
Amgen Inc.	$95 LUMAKRAS $95
GlaxoSmithKline, LLC.	$70 NUCALA $70

**Types of Payments**
Food and Beverage	$400

Biography

Dr. Mary Mahoney's areas of specialization are general practice and surgery; she sees patients in Eureka, CA. These areas are among her clinical interests: prosthetics, fine needle aspiration (FNA), and bloodless medicine/transfusion-free surgery. Dr. Mahoney attended medical school at Stanford University School of Medicine. She is professionally affiliated with Providence.