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Home > OR Providers > Gynecologic Oncologists
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Dr. Cassandra Michelle Niemi, MD

Accepting New Patients
Specializes in: Gynecologic Oncology
University of Michigan Medical School (2011)
Professional interests include: endometrial cancer, vulvar cancer, ovarian cancer, and more.
4805 Northeast Glisan Street Suite 11N-1
Portland, OR 97213

Dr. Cassandra Michelle Niemi, MD is a gynecologic oncologist in Portland, OR specializing in gynecologic oncology. She graduated from University of Michigan Medical School in 2011 and has 15 years of experience. Dr. Cassandra Michelle Niemi, MD is affiliated with Providence and Providence Medical Group - Oregon.

View Doctor's Full Profile (503) 215-5696

Office Locations

4805 Northeast Glisan Street Suite 11N-1
Portland, OR 97213
open_in_new

Some issues Dr. Cassandra Michelle Niemi, 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.

Medicare Procedure and Patient Information

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Cassandra Michelle Niemi, MD.

Gender
Male 0
Female 12

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Cassandra Michelle Niemi, MD treated as a gynecologic oncologist in Portland, OR during 2019 were minimally invasive procedures, CT scan, chemotherapy and biological response modifier (BRM) therapy.

Volume of procedures performed by Dr. Cassandra Michelle Niemi, MD for Medicare patients.

abdominal imaging 33
biological response modifier (BRM) therapy 64
chemotherapy 64
CT scan 66
minimally invasive procedures 98
pelvic imaging 33
thoracic (chest) imaging 33

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Cassandra Michelle Niemi, MD.

Gender
Male 59
Female 91
Ethnicity
Non-Hispanic White 127
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 83
From 75 to 84 42
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Cassandra Michelle Niemi, MD in 2019

Hypertension 55
High Cholesterol 42
Stroke 0
Ischemic Heart Disease 32
Depression 21
Chronic Kidney Disease 35
Asthma 0
Osteoperosis 9
Atrial Fibrilation 11
Heart Failure 20
Chronic Obstructive Pulmonary Disease 15
Diabetes 28
Dementia 0
Cancer 32

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Cassandra Michelle Niemi, MD treated as a gynecologic oncologist in Portland, OR during 2020 were lab tests, minimally invasive procedures, chemotherapy and biological response modifier (BRM) therapy.

Volume of procedures performed by Dr. Cassandra Michelle Niemi, MD for Medicare patients.

abdominal imaging 13
biological response modifier (BRM) therapy 103
blood draw 85
chemotherapy 103
CT scan 28
doctor visit 122
gynecologic procedures 16
lab tests 305
minimally invasive procedures 157
pelvic imaging 13
thoracic (chest) imaging 15

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Cassandra Michelle Niemi, MD.

Gender
Male 48
Female 116
Ethnicity
Non-Hispanic White 139
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 98
From 75 to 84 35
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Cassandra Michelle Niemi, MD in 2020

Hypertension 49
High Cholesterol 32
Stroke 0
Ischemic Heart Disease 18
Depression 21
Chronic Kidney Disease 30
Asthma 0
Osteoperosis 10
Atrial Fibrilation 8
Heart Failure 15
Chronic Obstructive Pulmonary Disease 10
Diabetes 18
Dementia 0
Cancer 42

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

Volume of procedures performed by Dr. Cassandra Michelle Niemi, MD for Medicare patients.

doctor visit 56

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Cassandra Michelle Niemi, MD.

Gender
Male 0
Female 30

Conditions of Medicare patients treated by Dr. Cassandra Michelle Niemi, MD in 2021

Hypertension 63
High Cholesterol 43
Stroke 0
Ischemic Heart Disease 0
Depression 0
Chronic Kidney Disease 0
Asthma 0
Osteoperosis 0
Atrial Fibrilation 0
Heart Failure 0
Chronic Obstructive Pulmonary Disease 0
Diabetes 0
Dementia 0
Cancer 0

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

Volume of procedures performed by Dr. Cassandra Michelle Niemi, MD for Medicare patients.

doctor visit 73

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Cassandra Michelle Niemi, MD.

Gender
Male 0
Female 45
Age
From 65 to 74 29
From 75 to 84 0
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Cassandra Michelle Niemi, MD in 2022

Hypertension 71
High Cholesterol 47
Stroke 0
Ischemic Heart Disease 0
Depression 24
Chronic Kidney Disease 0
Asthma 0
Osteoperosis 0
Atrial Fibrilation 0
Heart Failure 0
Chronic Obstructive Pulmonary Disease 0
Diabetes 0
Dementia 0
Cancer 44

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

Volume of procedures performed by Dr. Cassandra Michelle Niemi, MD for Medicare patients.

doctor visit 67

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Cassandra Michelle Niemi, MD.

Gender
Male 0
Female 59
Ethnicity
Non-Hispanic White 45
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 34
From 75 to 84 12
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Cassandra Michelle Niemi, MD in 2023

Hypertension 75
High Cholesterol 69
Stroke 0
Ischemic Heart Disease 0
Depression 31
Chronic Kidney Disease 24
Asthma 0
Osteoperosis 24
Atrial Fibrilation 19
Heart Failure 25
Chronic Obstructive Pulmonary Disease 0
Diabetes 34
Dementia 0
Cancer 44

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

Volume of procedures performed by Dr. Cassandra Michelle Niemi, MD for Medicare patients.

doctor visit 135

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Cassandra Michelle Niemi, MD.

Gender
Male 0
Female 72
Ethnicity
Non-Hispanic White 60
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 39
From 75 to 84 19
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Cassandra Michelle Niemi, MD in 2024

Hypertension 72
High Cholesterol 58
Stroke 0
Ischemic Heart Disease 17
Depression 29
Chronic Kidney Disease 15
Asthma 0
Osteoperosis 28
Atrial Fibrilation 21
Heart Failure 22
Chronic Obstructive Pulmonary Disease 0
Diabetes 19
Dementia 0
Cancer 40

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2018 - 2024

Volume of procedures performed by Dr. Cassandra Michelle Niemi, MD for Medicare patients.

The highest averages for the top procedures that Dr. Cassandra Michelle Niemi, MD treated as a gynecologic oncologist in Portland, OR were lab tests, minimally invasive procedures, blood draw and chemotherapy.

abdominal imaging 23
biological response modifier (BRM) therapy 83
blood draw 85
chemotherapy 83
CT scan 47
doctor visit 90
gynecologic procedures 16
lab tests 305
minimally invasive procedures 127
pelvic imaging 23
thoracic (chest) imaging 24

Average Medicare Patient Data From 2018 - 2024

Information about Medicare patients treated by Dr. Cassandra Michelle Niemi, MD.

Gender
Male 15
Female 60
Ethnicity
Black / African American 0
Asian / Pacific Islander 0
Non-Hispanic White 53
Native American / Alaskan Native 0
Hispanic 0
Other 0
Age
75 to 84 15
85 and over 0
Less than 65 0
65 to 74 40

Average of Total of Conditions of Medicare patients treated by Dr. Cassandra Michelle Niemi, MD From 2018 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. Cassandra Michelle Niemi, MD treated were hypertension, high cholesterol, cancer and depression.

Hypertension 55
High Cholesterol 41
Stroke 0
Ischemic Heart Disease 9
Depression 18
Chronic Kidney Disease 14
Asthma 0
Osteoporosis 10
Heart Failure 11
Chronic Obstructive Pulmonary Disease 3
Diabetes 14
Atrial Fibrillation 8
Dementia 0
Cancer 28

Education & Training

Dr. Cassandra Michelle Niemi, MD graduated from University of Michigan Medical School in 2011. She completed residency at Oregon Health & Science University Affiliated Hospitals. She is certified by the American Board of Obstetrics and Gynecology, Obstetrics and Gynecology and has a state license in Oregon.

Medical School: University of Michigan Medical School (2011)

Residency: Oregon Health & Science University Affiliated Hospitals (2015)

Board Certification: American Board of Obstetrics and Gynecology, Obstetrics and Gynecology

Licensed In: Oregon

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. Cassandra Michelle Niemi, MD appears to accept the following insurance providers: First Choice Health, TRICARE Prime, TRICARE For Life, CIGNA PPO, Medicare Advantage, CIGNA Open Access Plus, United Healthcare, Medicaid, Blue Cross/Blue Shield, CHAMPVA, United Healthcare PPO, United Healthcare POS, Providence, Regence, US Family Health Plan, Tricare West, Medicare AB, Aetna PROV Employee POS, Tricare Select, Moda Connexus Network, Age Right Marquis Advantage and Samaritan Health Plan Med Advantage.

Insurance Accepted by Provider includes:

According to our sources, Dr. Cassandra Michelle Niemi, MD accepts the following insurance providers:

First Choice Health
TRICARE Prime
TRICARE For Life
CIGNA PPO
Medicare Advantage
CIGNA Open Access Plus
United Healthcare
Medicaid
Blue Cross/Blue Shield
CHAMPVA
United Healthcare PPO
United Healthcare POS
Providence
Regence
US Family Health Plan
Tricare West
Medicare AB
Aetna PROV Employee POS
Tricare Select
Moda Connexus Network
Age Right Marquis Advantage
Samaritan Health Plan Med Advantage

Ratings & Reviews

Dr. Cassandra Michelle Niemi, MD has an exceptional overall rating with an average of 5.0 out of 5 stars based on 260 ratings. We collect ratings and reviews of Dr. Cassandra Michelle Niemi, MD from all over the web to help you find the right in Portland, OR. 

5
Overall Rating
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Reviews From Around The Web
Overall Rating: 5.0 2024-10-07
Patient verified via Press Ganey
I sought out Dr Naomi for a 2nd opinion for a surgery I needed. After the consult, I decide to change my previous scheduled surgery (at a different hospital) and go with Dr Neimi. I'm so glad I did. Dr Neimi put me at ease - was patient, thorough, explained everything to me, made sure I had all my questions answered, and made me feel comfortable and confident in the decision I made and her care. Her warm presence and bedside manner was reassuring. Post-operative follow up visit proved the same. Her surgical nursing staff team was also top notch. Excellent care all around and will gladly recommend Dr Neimi and Providence Hospital.
Overall Rating: 5.0 2024-04-12
Patient verified via Press Ganey
Dr. Nieme is one of the most patient, easy, well informed, direct Drs. I have met. She makes it easy to share your concerns and takes a genuine interest in your care. She was open to Alternative medicine when I broached the topic. I do appreciate her, she remained very positive through the lab corp transition, which was anything but smooth. Pretty much a-good team supporting her.. Leave it at that.
Overall Rating: 5.0 2026-06-30
Patient verified via Press Ganey
I am so grateful to be Dr Niemi's patient, and receive care from her entire team as well. I am alive because of them. Dr. Niemi and all of her care team give us the very best care, And value our lives. I am a cancer patient, and I do not go through this alone because of Dr Niemi and her team. My primary physician promised me that he would send me to the very best. And he did.
Overall Rating: 5.0 2025-10-22
Patient verified via Press Ganey
I think Dr. Niemi is a shining of example of how all doctors should interact with their patients. She is very calm, explains things well, and provides a very logical explanation of what is happening, why, and when. I feel like my medical concern was handled by her in a way that was very reassuring that I was in excellent hands and I had nothing to worry about.
Overall Rating: 5.0 2023-09-12
Patient verified via Press Ganey
I feel safe with Dr. Niemi. I have had some incredibly bad experiences involving medical professionals. I developed PTSD because of my skin color. It has taken decades to resolve the issues and I recently encountered an incident that triggered my PTSD. Dr. Niemi treated me with respect and saw me as a human being. She treated me as an equal. I trust her.
Overall Rating: 5.0 2023-02-03
Patient verified via Press Ganey
From the beginning of my diagnosis to the completion of the surgery & to the the last follow up visit Dr. Niemi & all the staff in her department treated me with compassion, respect & were very helpful in guiding me through my treatment and any concerns I had. I was very apprehensive & nervous about the procedure and everyone was so very helpful .
Overall Rating: 5.0 2025-11-24
Patient verified via Press Ganey
I think Dr Neimi might be the best doctor I've ever had. She got me into surgery as soon as possible and I am feeling better than I have in years. I'd also like to thank my ER Doctor at Willamette Falls, I forget his name, for getting me in to see her the next morning after my ER visit. If you could pass that along for me, I'd appreciate it)
Overall Rating: 5.0 2024-05-11
Patient verified via Press Ganey
Dr Niemi was the most impressive physician I've been exposed to maybe EVER. She has been the bright smart light who has kept me grounded and enlightened/informed straight out of the gate in regards to a recent diagnosis I'm still in the process of learning about. Thank god for medical professionals like her, who are also, deeply human.
Overall Rating: 5.0 2024-05-13
Patient verified via Press Ganey
Dr. Niemi is a wonderful doctor! She always makes me feel as if she has ALL the time in the world for me-never rushed. She is thoughtful, a good listener, she knows about my case and what to offer to help me moving forward. She is honest, yet kind as she shares sometimes difficult information to hear. I'm so thankful for her.
Overall Rating: 5.0 2026-03-23
Patient verified via Press Ganey
Dr Niemi is an excellent doctor. She is very caring and connects with her patients by knowing their history and needs. She is willing to discuss any questions or concerns. She is very knowledgeable and explains information about your healthcare in plain language. I would highly recommend her. She is excellent in her field.

To see all 260 reviews for Dr. Cassandra Michelle Niemi, MD, view their full profile.

General Payments

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

Payments by Company
AstraZeneca Pharmaceuticals LP $316 LYNPARZA
$157
$159
TESARO, Inc. $243 ZEJULA
$243
Merck Sharp & Dohme LLC $241 LYNPARZA
$124 		KEYTRUDA
$118
EISAI INC. $120 Lenvima
$120
Intuitive Surgical, Inc. $114 Da Vinci Surgical System
$114
Other $227 FOUNDATIONONE LIQUID
$104 		Echelon Powered Circular
$87 		TIVDAK
$26 		Rubraca
$11
Types of Payments
Food and Beverage $1,251
Education $11

Biography

Dr. Cassandra Niemi is a gynecologic oncology specialist in Portland, OR. Her average patient rating is 5.0 stars (out of 5). These areas are among Dr. Niemi's clinical interests: fallopian tube cancer, ovarian cancer surgery, and ovarian cancer. She is affiliated with Providence St. Vincent Medical Center. Dr. Niemi appears to be an in-network provider for Regence, Blue Cross/Blue Shield, United Healthcare POS, and more. Her practice in Portland, OR is open to new patients as reported by Providence. Before performing her residency at a hospital affiliated with Oregon Health & Science University, Dr. Niemi attended the University of Michigan Medical School.

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