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Home > CA Providers > Rheumatologists

Dr. Mariko L. Ishimori, MD

Accepting New Patients

(Mariko L. Ishimori, MD)

(148 Ratings)

Specializes in: Rheumatology (Arthritis & Autoimmune Diseases)

New York University (NYU) School of Medicine

Professional interests include: rheumatic diseases, lupus

8723 Alden Drive Spielberg, Suite 250
Los Angeles, CA 90048

(310) 423-6257

Dr. Mariko L. Ishimori, MD is a rheumatologist in Los Angeles, CA specializing in rheumatology (arthritis & autoimmune diseases). She graduated from New York University (NYU) School of Medicine. Dr. Mariko L. Ishimori, MD is affiliated with Cedars-Sinai.

Office Locations

8723 Alden Drive Spielberg, Suite 250
Los Angeles, CA 90048

open_in_new

Noteworthy Medicare Patient Procedures Performed by Dr. Mariko L. Ishimori, MD in 2023

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

Top 5%

By Affordability:

hospital care

inpatient care

inpatient hospital care

In 2023, Dr. Mariko L. Ishimori, MD 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 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.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

doctor visit	118

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

doctor visit	97

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mariko L. Ishimori, MD.

**Gender**
Male	17
Female	40

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

**Age**
From 65 to 74	30
From 75 to 84	0
85 and over	0
Less than 65	16

Conditions of Medicare patients treated by Dr. Mariko L. Ishimori, MD in 2013

Hypertension	68
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	44
Depression	32
Chronic Kidney Disease	30
Asthma	0
Osteoperosis	21
Atrial Fibrilation	0
Heart Failure	19
Chronic Obstructive Pulmonary Disease	0
Diabetes	33
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

doctor visit	167

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mariko L. Ishimori, MD.

**Gender**
Male	22
Female	54

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

**Age**
From 65 to 74	41
From 75 to 84	0
85 and over	0
Less than 65	19

Conditions of Medicare patients treated by Dr. Mariko L. Ishimori, MD in 2014

Hypertension	67
High Cholesterol	57
Stroke	0
Ischemic Heart Disease	46
Depression	32
Chronic Kidney Disease	22
Asthma	0
Osteoperosis	20
Atrial Fibrilation	0
Heart Failure	18
Chronic Obstructive Pulmonary Disease	0
Diabetes	32
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

doctor visit	168

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mariko L. Ishimori, MD.

**Gender**
Male	32
Female	128

**Ethnicity**
Non-Hispanic White	94
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	88
From 75 to 84	0
85 and over	0
Less than 65	32

Conditions of Medicare patients treated by Dr. Mariko L. Ishimori, MD in 2015

Hypertension	64
High Cholesterol	55
Stroke	0
Ischemic Heart Disease	44
Depression	26
Chronic Kidney Disease	28
Asthma	16
Osteoperosis	25
Atrial Fibrilation	16
Heart Failure	23
Chronic Obstructive Pulmonary Disease	0
Diabetes	38
Dementia	0
Cancer	15

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

doctor visit	216

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mariko L. Ishimori, MD.

**Gender**
Male	24
Female	73

**Ethnicity**
Non-Hispanic White	56
Black	11
Hispanic	11
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	50
From 75 to 84	0
85 and over	0
Less than 65	25

Conditions of Medicare patients treated by Dr. Mariko L. Ishimori, MD in 2016

Hypertension	68
High Cholesterol	45
Stroke	0
Ischemic Heart Disease	29
Depression	29
Chronic Kidney Disease	29
Asthma	15
Osteoperosis	28
Atrial Fibrilation	0
Heart Failure	19
Chronic Obstructive Pulmonary Disease	14
Diabetes	35
Dementia	0
Cancer	11

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Mariko L. Ishimori, MD treated as a rheumatologist in Los Angeles, CA during 2017 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

doctor visit	213
hospital care	36
inpatient care	36

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mariko L. Ishimori, MD.

**Gender**
Male	29
Female	91

**Ethnicity**
Non-Hispanic White	65
Black	15
Hispanic	20
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	61
From 75 to 84	0
85 and over	0
Less than 65	34

Conditions of Medicare patients treated by Dr. Mariko L. Ishimori, MD in 2017

Hypertension	68
High Cholesterol	48
Stroke	0
Ischemic Heart Disease	38
Depression	33
Chronic Kidney Disease	30
Asthma	13
Osteoperosis	31
Atrial Fibrilation	9
Heart Failure	26
Chronic Obstructive Pulmonary Disease	17
Diabetes	31
Dementia	10
Cancer	0

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

doctor visit	271

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mariko L. Ishimori, MD.

**Gender**
Male	36
Female	100

**Ethnicity**
Non-Hispanic White	78
Black	18
Hispanic	15
Asian	11
Other	14
Native American	0

**Age**
From 65 to 74	71
From 75 to 84	31
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mariko L. Ishimori, MD in 2018

Hypertension	68
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	40
Depression	34
Chronic Kidney Disease	29
Asthma	10
Osteoperosis	29
Atrial Fibrilation	0
Heart Failure	18
Chronic Obstructive Pulmonary Disease	8
Diabetes	28
Dementia	0
Cancer	12

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Mariko L. Ishimori, MD treated as a rheumatologist in Los Angeles, CA during 2019 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

doctor visit	230
hospital care	33
inpatient care	33

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mariko L. Ishimori, MD.

**Gender**
Male	35
Female	80

**Ethnicity**
Non-Hispanic White	70
Black	0
Hispanic	15
Asian	11
Other	0
Native American	0

**Age**
From 65 to 74	63
From 75 to 84	0
85 and over	0
Less than 65	29

Conditions of Medicare patients treated by Dr. Mariko L. Ishimori, MD in 2019

Hypertension	0
High Cholesterol	53
Stroke	0
Ischemic Heart Disease	35
Depression	35
Chronic Kidney Disease	28
Asthma	12
Osteoperosis	27
Atrial Fibrilation	0
Heart Failure	21
Chronic Obstructive Pulmonary Disease	11
Diabetes	33
Dementia	11
Cancer	14

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Mariko L. Ishimori, MD treated as a rheumatologist in Los Angeles, CA during 2020 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

doctor visit	183
hospital care	36
inpatient care	36

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mariko L. Ishimori, MD.

**Gender**
Male	40
Female	84

**Ethnicity**
Non-Hispanic White	71
Black	15
Hispanic	15
Asian	11
Other	12
Native American	0

**Age**
From 65 to 74	61
From 75 to 84	0
85 and over	0
Less than 65	31

Conditions of Medicare patients treated by Dr. Mariko L. Ishimori, MD in 2020

Hypertension	66
High Cholesterol	61
Stroke	0
Ischemic Heart Disease	37
Depression	33
Chronic Kidney Disease	28
Asthma	12
Osteoperosis	24
Atrial Fibrilation	11
Heart Failure	24
Chronic Obstructive Pulmonary Disease	0
Diabetes	35
Dementia	16
Cancer	10

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Mariko L. Ishimori, MD treated as a rheumatologist in Los Angeles, CA during 2021 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

doctor visit	205
hospital care	42
inpatient care	42

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mariko L. Ishimori, MD.

**Gender**
Male	34
Female	88

**Ethnicity**
Non-Hispanic White	69
Black	0
Hispanic	18
Asian	0
Other	14
Native American	0

**Age**
From 65 to 74	52
From 75 to 84	33
85 and over	11
Less than 65	26

Conditions of Medicare patients treated by Dr. Mariko L. Ishimori, MD in 2021

Hypertension	67
High Cholesterol	61
Stroke	0
Ischemic Heart Disease	43
Depression	25
Chronic Kidney Disease	30
Asthma	0
Osteoperosis	30
Atrial Fibrilation	9
Heart Failure	24
Chronic Obstructive Pulmonary Disease	0
Diabetes	35
Dementia	15
Cancer	0

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mariko L. Ishimori, MD treated as a rheumatologist in Los Angeles, CA during 2022 were hospital care and inpatient care.

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

doctor visit	215
hospital care	14
inpatient care	14

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mariko L. Ishimori, MD.

**Gender**
Male	29
Female	92

**Ethnicity**
Non-Hispanic White	79
Black	13
Hispanic	14
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	51
From 75 to 84	37
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Mariko L. Ishimori, MD in 2022

Hypertension	69
High Cholesterol	71
Stroke	0
Ischemic Heart Disease	31
Depression	23
Chronic Kidney Disease	21
Asthma	15
Osteoperosis	36
Atrial Fibrilation	12
Heart Failure	18
Chronic Obstructive Pulmonary Disease	17
Diabetes	34
Dementia	9
Cancer	19

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Mariko L. Ishimori, MD for Medicare patients.

The highest averages for the top procedures that Dr. Mariko L. Ishimori, MD treated as a rheumatologist in Los Angeles, CA were hospital care and inpatient care.

doctor visit	189
hospital care	32
inpatient care	32

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Mariko L. Ishimori, MD.

**Gender**
Male	27
Female	75

**Ethnicity**
Black / African American	6
Asian / Pacific Islander	3
Non-Hispanic White	61
Hispanic	9
Native American / Alaskan Native	0
Other	3

**Age**
75 to 84	9
85 and over	1
Less than 65	19
65 to 74	51

Average of Total of Conditions of Medicare patients treated by Dr. Mariko L. Ishimori, MD From 2012 - 2022

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

Hypertension	55
High Cholesterol	50
Stroke	0
Ischemic Heart Disease	35
Depression	27
Chronic Kidney Disease	25
Asthma	8
Osteoporosis	24
Heart Failure	19
Chronic Obstructive Pulmonary Disease	6
Diabetes	30
Atrial Fibrillation	5
Cancer	7
Dementia	5

Education & Training

Dr. Mariko L. Ishimori, MD graduated from New York University (NYU) School of Medicine. She completed residency at Cedars-Sinai Medical Center. She is certified by the IM/Rheumatology, American Board of Internal Medicine General Internal Medicine, American Board of Internal Medicine and has a state license in California.

Medical School: New York University (NYU) School of Medicine

Residency: Cedars-Sinai Medical Center

Board Certification: IM/Rheumatology, American Board of Internal Medicine General Internal Medicine, American Board of Internal Medicine

Licensed In: California

Affiliations & Hospitals

Dr. Mariko L. Ishimori, MD is associated with these hospitals and organizations:

Cedars-Sinai

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. Mariko L. Ishimori, MD appears to accept the following insurance providers: CIGNA PPO, CIGNA HMO, MultiPlan PPO, MultiPlan, United Healthcare PPO, Coventry PPO, United Healthcare HMO, Railroad Medicare, United Healthcare, Anthem Blue Cross HMO, Anthem Blue Cross PPO, Humana, Cigna, Medi-Cal, Anthem, Health Net PPO, Health Net HMO, HealthSmart PPO, HealthSmart, Optima Health, First Health, Beech Street, Aetna PPO, Aetna HMO, Aetna ACO, Aids Healthcare Foundation HMO, Gold Coast PPO, Aids Healthcare Foundation PPO, Blue Shield California HMO, Health Net MAH, Aids Healthcare Foundation MAH, CareMore HMO, Blue Shield California PPO, Medicare MCR, Blue Shield California MAH and CareMore MAH.

Insurance Accepted by Provider includes:

According to our sources, Dr. Mariko L. Ishimori, MD accepts the following insurance providers:

CIGNA PPO

CIGNA HMO

MultiPlan PPO

MultiPlan

United Healthcare PPO

Coventry PPO

United Healthcare HMO

Railroad Medicare

United Healthcare

Anthem Blue Cross HMO

Anthem Blue Cross PPO

Humana

Cigna

Medi-Cal

Anthem

Health Net PPO

Health Net HMO

HealthSmart PPO

HealthSmart

Optima Health

First Health

Beech Street

Aetna PPO

Aetna HMO

Aetna ACO

Aids Healthcare Foundation HMO

Gold Coast PPO

Aids Healthcare Foundation PPO

Blue Shield California HMO

Health Net MAH

Aids Healthcare Foundation MAH

CareMore HMO

Blue Shield California PPO

Medicare MCR

Blue Shield California MAH

CareMore MAH

Ratings & Reviews

Dr. Mariko L. Ishimori, MD has an exceptional overall rating with an average of 4.89 out of 5 stars based on 148 ratings. We collect ratings and reviews of Dr. Mariko L. Ishimori, MD from all over the web to help you find the right in Los Angeles, CA.

4.89

Overall Rating

(148 Ratings)

Leave a Review

Reviews From Around The Web

Overall Rating: 4.0 2025-07-09

Patient verified via Press Ganey

I was expecting the worst because her med student/fellow wasn't fully listening to me and continuously cutting me off while doing my intake. I was pleasantly surprised that the actually doctor was so much more helpful, thorough, and welcoming. The doctor even mentioned that she reviewed my file the night before, which I found very impressive.

Overall Rating: 5.0 2024-02-16

Patient verified via Press Ganey

I actually had more time to ask questions and receive detailed information than with an in office appointment.

Overall Rating: 5.0 2025-11-21

Patient verified via Press Ganey

Really listened to my concerns to try and figure out what Is going on. Very thorough and takes her time.

Overall Rating: 5.0 2024-08-30

Patient verified via Press Ganey

Dr. Ishimori is so patient and listens to my questions. The nurse is so friendly.

Overall Rating: 5.0 2024-02-03

Patient verified via Press Ganey

Dr.Mariko Ishimori is one of the best physicians I know.

Overall Rating: 5.0 2025-10-24

Patient verified via Press Ganey

Excellent and caring service by physician.

Overall Rating: 5.0 2025-03-28

Patient verified via Press Ganey

Good interaction with Dr Ishimori

Overall Rating: 5.0 2024-12-20

Patient verified via Press Ganey

Always the best

Overall Rating: 5.0 2023-12-12

Patient verified via Press Ganey

Good visit

Biography

Dr. Mariko Ishimori practices rheumatology (arthritis & autoimmune diseases). She has a 5.0 out of 5 star average patient rating. Dr. Ishimori is especially interested in lupus. She is affiliated with Cedars-Sinai. Anthem, Blue California, and HealthSmart appears to be the insurance carriers that Dr. Ishimori takes. Dr. Ishimori has an open panel in Los Angeles, CA according to Yext. She studied medicine at New York Medical College and New York University (NYU) School of Medicine. Her medical residency was performed at Cedars-Sinai Medical Center. Dr. Ishimori has received distinctions including Member, Curriculum Subcommittee, Training Program in Translational Science; Reviewer: Lupus Reviewer: Arthritis Care and Research; and Fellow, American College of Rheumatology.