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Dr. Rena D. Callahan, MD

Accepting New Patients

(Dr. Rena Desai Callahan, M.D.)

(613 Ratings)

Specializes in: Medical Oncology, Adult Oncology, Adult Hematology and Surgical Oncology (Cancer Surgery)

University of Pennsylvania School of Medicine (2004)

Professional interests include: breast cancer, metastatic breast cancer, male breast cancer

2336 Santa Monica Boulevard
Santa Monica, CA 90404

(310) 998-4747

Dr. Rena D. Callahan, MD is a medical oncologist in Santa Monica, CA specializing in medical oncology, adult oncology, adult hematology and surgical oncology (cancer surgery). She graduated from University of Pennsylvania School of Medicine in 2004 and has 22 years of experience. Dr. Rena D. Callahan, MD is affiliated with UCLA Health, UCLA Santa Monica Medical Center, THE REGENTS OF THE UNIVERSITY OF CALIFORNIA and PARAGON PHYSICAL THERAPY AND REHAB LLC.

Office Locations

UCLA Santa Monica Medical Center

1223 16th Street Suite 3100
Santa Monica, CA 90404

(310) 825-2144

(424) 259-8796

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UCLA Santa Monica Medical Center

2336 Santa Monica Boulevard
Santa Monica, CA 90404

(310) 998-4747

(310) 998-4757

open_in_new

27235 Tourney Road Suite 2400
Valencia, CA 91355

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In The News (see more mentions in the news)

“Following Dr. Slamon's presentation, an impressive panel of UCLA physicians took the stage to delve deeper into the intricacies of cancer care, including Dr. Alexander Black, Dr. Rena Callahan, Dr....”—"Teresa Todd | Shedding Light on Cancer", Santa Clarita Valley Signal, April 2024

“Dr. Rena Callahan, a member of the UCLA Hematology-Oncology Department and Crawford's personal doctor, accredits Crawford's presence, and that of many others living with MBC, to the advances in...”—"METAvivor Met Gala brights light to an invisible disease", Santa Clarita Valley Signal, September 2023

“Dr. Rena Callahan, of the UCLA Hematology-Oncology Department, will be the keynote speaker.”—"METAvivor 2nd Annual Met Gala set for Sept. 9", Santa Clarita Valley Signal, August 2023

Noteworthy Medicare Patient Procedures Performed by Dr. Rena D. Callahan, MD in 2023

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

Top 5%

By Volume:

antineoplastic hormone therapy

biological response modifier therapy

complete blood count

intravenous chemotherapy

intravenous infusion

By Affordability:

intravenous infusion

In 2023, among providers in related specialties within California, Dr. Rena D. Callahan, MD performed more antineoplastic hormone therapy, biological response modifier (BRM) therapy, complete blood count (CBC), intravenous (IV) chemotherapy, and intravenous (IV) infusion procedures for Medicare patients than 95% of them and she also had a list price for intravenous (IV) infusion that was lower than the list prices billed to Medicare by 95% 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.

Top 25%

By Volume:

blood draw

phlebotomy for lab tests

In 2012, Dr. Rena D. Callahan, MD performed more blood draw, and phlebotomy for lab tests 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. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA during 2012 were hospital care, inpatient care, blood draw and lab tests.

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

biological response modifier (BRM) therapy	77
blood draw	124
chemotherapy	77
doctor visit	423
hospital care	386
inpatient care	386
lab tests	88
minimally invasive procedures	77

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA during 2013 were hospital care, inpatient care, blood draw and lab tests.

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

biological response modifier (BRM) therapy	134
blood draw	248
chemotherapy	134
doctor visit	745
hospital care	283
inpatient care	283
lab tests	200
minimally invasive procedures	134

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Rena D. Callahan, MD.

**Gender**
Male	95
Female	234

**Ethnicity**
Non-Hispanic White	221
Black	27
Hispanic	46
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	137
From 75 to 84	107
85 and over	42
Less than 65	43

Conditions of Medicare patients treated by Dr. Rena D. Callahan, MD in 2013

Hypertension	73
High Cholesterol	55
Stroke	7
Ischemic Heart Disease	41
Depression	36
Chronic Kidney Disease	39
Asthma	9
Osteoperosis	16
Atrial Fibrilation	14
Heart Failure	30
Chronic Obstructive Pulmonary Disease	20
Diabetes	32
Dementia	17
Cancer	53

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA during 2014 were lab tests, blood draw, chemotherapy and biological response modifier (BRM) therapy.

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

biological response modifier (BRM) therapy	171
blood draw	358
chemotherapy	171
doctor visit	853
hospital care	140
inpatient care	140
lab tests	570
minimally invasive procedures	171

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Rena D. Callahan, MD.

**Gender**
Male	77
Female	243

**Ethnicity**
Non-Hispanic White	227
Black	27
Hispanic	34
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	146
From 75 to 84	89
85 and over	42
Less than 65	43

Conditions of Medicare patients treated by Dr. Rena D. Callahan, MD in 2014

Hypertension	71
High Cholesterol	51
Stroke	9
Ischemic Heart Disease	33
Depression	33
Chronic Kidney Disease	31
Asthma	10
Osteoperosis	18
Atrial Fibrilation	13
Heart Failure	24
Chronic Obstructive Pulmonary Disease	16
Diabetes	24
Dementia	12
Cancer	56

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA during 2015 were lab tests, blood draw, hospital care and inpatient care.

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

biological response modifier (BRM) therapy	174
blood draw	316
chemotherapy	174
doctor visit	888
hospital care	226
inpatient care	226
lab tests	617
minimally invasive procedures	198
port flush	19

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Rena D. Callahan, MD.

**Gender**
Male	206
Female	502

**Ethnicity**
Non-Hispanic White	514
Black	52
Hispanic	74
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	346
From 75 to 84	188
85 and over	86
Less than 65	88

Conditions of Medicare patients treated by Dr. Rena D. Callahan, MD in 2015

Hypertension	70
High Cholesterol	52
Stroke	10
Ischemic Heart Disease	34
Depression	27
Chronic Kidney Disease	38
Asthma	15
Osteoperosis	16
Atrial Fibrilation	12
Heart Failure	22
Chronic Obstructive Pulmonary Disease	17
Diabetes	27
Dementia	14
Cancer	51

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA during 2016 were lab tests, blood draw, hospital care and inpatient care.

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

biological response modifier (BRM) therapy	146
blood draw	387
chemotherapy	146
doctor visit	863
hormone therapy	64
hospital care	247
inpatient care	247
lab tests	735
minimally invasive procedures	174

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Rena D. Callahan, MD.

**Gender**
Male	126
Female	318

**Ethnicity**
Non-Hispanic White	325
Black	24
Hispanic	49
Asian	28
Other	0
Native American	0

**Age**
From 65 to 74	229
From 75 to 84	115
85 and over	42
Less than 65	58

Conditions of Medicare patients treated by Dr. Rena D. Callahan, MD in 2016

Hypertension	68
High Cholesterol	51
Stroke	9
Ischemic Heart Disease	36
Depression	30
Chronic Kidney Disease	35
Asthma	17
Osteoperosis	16
Atrial Fibrilation	10
Heart Failure	22
Chronic Obstructive Pulmonary Disease	15
Diabetes	26
Dementia	12
Cancer	58

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA during 2017 were lab tests, blood draw, minimally invasive procedures and hospital care.

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

biological response modifier (BRM) therapy	181
blood draw	499
chemotherapy	181
doctor visit	1102
hormone therapy	136
hospital care	198
inpatient care	198
lab tests	711
minimally invasive procedures	228

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Rena D. Callahan, MD.

**Gender**
Male	98
Female	358

**Ethnicity**
Non-Hispanic White	347
Black	20
Hispanic	44
Asian	27
Other	18
Native American	0

**Age**
From 65 to 74	227
From 75 to 84	132
85 and over	47
Less than 65	50

Conditions of Medicare patients treated by Dr. Rena D. Callahan, MD in 2017

Hypertension	68
High Cholesterol	45
Stroke	7
Ischemic Heart Disease	31
Depression	30
Chronic Kidney Disease	34
Asthma	11
Osteoperosis	19
Atrial Fibrilation	13
Heart Failure	20
Chronic Obstructive Pulmonary Disease	14
Diabetes	28
Dementia	11
Cancer	61

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA during 2018 were lab tests, blood draw, chemotherapy and biological response modifier (BRM) therapy.

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

biological response modifier (BRM) therapy	190
blood draw	428
chemotherapy	190
doctor visit	1060
hormone therapy	96
hospital care	114
inpatient care	114
lab tests	483
minimally invasive procedures	182
port flush	14

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Rena D. Callahan, MD.

**Gender**
Male	84
Female	358

**Ethnicity**
Non-Hispanic White	331
Black	26
Hispanic	37
Asian	34
Other	14
Native American	0

**Age**
From 65 to 74	229
From 75 to 84	112
85 and over	42
Less than 65	59

Conditions of Medicare patients treated by Dr. Rena D. Callahan, MD in 2018

Hypertension	61
High Cholesterol	53
Stroke	4
Ischemic Heart Disease	28
Depression	28
Chronic Kidney Disease	33
Asthma	10
Osteoperosis	19
Atrial Fibrilation	11
Heart Failure	19
Chronic Obstructive Pulmonary Disease	14
Diabetes	28
Dementia	10
Cancer	69

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA during 2019 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

biological response modifier (BRM) therapy	140
blood draw	322
chemotherapy	140
doctor visit	1024
hormone therapy	88
hospital care	120
inpatient care	120
lab tests	469
minimally invasive procedures	205

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Rena D. Callahan, MD.

**Gender**
Male	64
Female	317

**Ethnicity**
Non-Hispanic White	287
Black	17
Hispanic	30
Asian	31
Other	0
Native American	0

**Age**
From 65 to 74	189
From 75 to 84	110
85 and over	38
Less than 65	44

Conditions of Medicare patients treated by Dr. Rena D. Callahan, MD in 2019

Hypertension	58
High Cholesterol	50
Stroke	4
Ischemic Heart Disease	25
Depression	25
Chronic Kidney Disease	30
Asthma	9
Osteoperosis	21
Atrial Fibrilation	9
Heart Failure	16
Chronic Obstructive Pulmonary Disease	12
Diabetes	28
Dementia	11
Cancer	71

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA during 2020 were lab tests, blood draw, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

biological response modifier (BRM) therapy	188
blood draw	296
chemotherapy	188
doctor visit	1063
hormone therapy	103
hospital care	50
inpatient care	50
lab tests	446
minimally invasive procedures	265
preventive care	13
vaccines	13

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Rena D. Callahan, MD.

**Gender**
Male	59
Female	323

**Ethnicity**
Non-Hispanic White	290
Black	14
Hispanic	26
Asian	34
Other	18
Native American	0

**Age**
From 65 to 74	204
From 75 to 84	105
85 and over	31
Less than 65	42

Conditions of Medicare patients treated by Dr. Rena D. Callahan, MD in 2020

Hypertension	55
High Cholesterol	47
Stroke	4
Ischemic Heart Disease	23
Depression	25
Chronic Kidney Disease	27
Asthma	9
Osteoperosis	24
Atrial Fibrilation	6
Heart Failure	14
Chronic Obstructive Pulmonary Disease	9
Diabetes	25
Dementia	9
Cancer	72

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA during 2021 were lab tests, minimally invasive procedures, blood draw and chemotherapy.

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

biological response modifier (BRM) therapy	223
blood draw	258
chemotherapy	223
doctor visit	1159
hormone therapy	177
hospital care	95
inpatient care	95
lab tests	468
minimally invasive procedures	290

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Rena D. Callahan, MD.

**Gender**
Male	70
Female	387

**Ethnicity**
Non-Hispanic White	333
Black	20
Hispanic	40
Asian	48
Other	16
Native American	0

**Age**
From 65 to 74	243
From 75 to 84	126
85 and over	30
Less than 65	58

Conditions of Medicare patients treated by Dr. Rena D. Callahan, MD in 2021

Hypertension	56
High Cholesterol	55
Stroke	5
Ischemic Heart Disease	28
Depression	24
Chronic Kidney Disease	28
Asthma	9
Osteoperosis	27
Atrial Fibrilation	7
Heart Failure	14
Chronic Obstructive Pulmonary Disease	12
Diabetes	25
Dementia	8
Cancer	72

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA during 2022 were lab tests, minimally invasive procedures, blood draw and hormone therapy.

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

biological response modifier (BRM) therapy	201
blood draw	287
chemotherapy	201
doctor visit	1261
hormone therapy	221
hospital care	53
inpatient care	53
lab tests	516
minimally invasive procedures	305
port flush	15

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Rena D. Callahan, MD.

**Gender**
Male	68
Female	470

**Ethnicity**
Non-Hispanic White	394
Black	27
Hispanic	42
Asian	49
Other	26
Native American	0

**Age**
From 65 to 74	283
From 75 to 84	169
85 and over	39
Less than 65	47

Conditions of Medicare patients treated by Dr. Rena D. Callahan, MD in 2022

Hypertension	62
High Cholesterol	66
Stroke	7
Ischemic Heart Disease	19
Depression	22
Chronic Kidney Disease	20
Asthma	11
Osteoperosis	34
Atrial Fibrilation	12
Heart Failure	12
Chronic Obstructive Pulmonary Disease	11
Diabetes	27
Dementia	5
Cancer	75

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Rena D. Callahan, MD for Medicare patients.

The highest averages for the top procedures that Dr. Rena D. Callahan, MD treated as a medical oncologist in Santa Monica, CA were lab tests, blood draw, minimally invasive procedures and hospital care.

biological response modifier (BRM) therapy	165
blood draw	320
chemotherapy	165
doctor visit	949
hormone therapy	126
hospital care	173
inpatient care	173
lab tests	482
minimally invasive procedures	202
preventive care	13
vaccines	13

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Rena D. Callahan, MD.

**Gender**
Male	86
Female	319

**Ethnicity**
Black / African American	23
Asian / Pacific Islander	22
Non-Hispanic White	297
Native American / Alaskan Native	0
Hispanic	38
Other	8

**Age**
75 to 84	113
85 and over	39
Less than 65	48
65 to 74	203

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

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

Hypertension	58
High Cholesterol	47
Stroke	6
Ischemic Heart Disease	27
Depression	25
Chronic Kidney Disease	28
Asthma	10
Osteoporosis	19
Heart Failure	17
Chronic Obstructive Pulmonary Disease	12
Diabetes	24
Atrial Fibrillation	9
Dementia	9
Cancer	58

Education & Training

Dr. Rena D. Callahan, MD graduated from University of Pennsylvania School of Medicine in 2004. She completed residency at Yale University Affiliated Hospitals. She is certified by the Medical Oncology, American Board of Internal Medicine and has a state license in California.

Medical School: University of Pennsylvania School of Medicine (2004)

Residency: Yale University Affiliated Hospitals

Board Certification: Medical Oncology, American Board of Internal Medicine (2011)

Licensed In: California

Affiliations & Hospitals

Dr. Rena D. Callahan, MD is associated with these hospitals and organizations:

UCLA Health

UCLA Santa Monica Medical Center

THE REGENTS OF THE UNIVERSITY OF CALIFORNIA

PARAGON PHYSICAL THERAPY AND REHAB LLC

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. Rena D. Callahan, MD appears to accept the following insurance providers: Cigna, TRICARE, Private Healthcare Systems (PHCS), Aetna, Blue Shield of California, MultiPlan, Anthem, UnitedHealthcare, Medicare Advantage, Prime Health, First Health, HealthSmart, Health Net of California, Centivo and UFCM Health System.

Insurance Accepted by Provider includes:

According to our sources, Dr. Rena D. Callahan, MD accepts the following insurance providers:

Cigna

TRICARE

Private Healthcare Systems (PHCS)

Aetna

Blue Shield of California

MultiPlan

Anthem

UnitedHealthcare

Medicare Advantage

Prime Health

First Health

HealthSmart

Health Net of California

Centivo

UFCM Health System

Ratings & Reviews

Dr. Rena D. Callahan, MD has an exceptional overall rating with an average of 4.99 out of 5 stars based on 613 ratings. We collect ratings and reviews of Dr. Rena D. Callahan, MD from all over the web to help you find the right in Santa Monica, CA.

4.99

Overall Rating

(613 Ratings)

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General Payments

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

**Payments by Company**
Gilead Sciences, Inc.	$140,954 Trodelvy $140,806	$148
Pfizer Inc.	$119,410 IBRANCE $67,978	TALZENNA $38,241	BOSULIF $34	INLYTA $26	MYLOTARG $20	Other $13,112
Seagen Inc.	$70,668 TUKYSA $70,668
Stemline Therapeutics Inc.	$67,866 Orserdu $65,826	$2,040
Lilly USA, LLC	$39,513 VERZENIO $32,607	CYRAMZA $21	$6,885
Other	$22,729 KISQALI $8,372	Nerlynx $4,328	TALZENNA $4,000	Trodelvy $2,250	TECENTRIQ $455	Other $3,324

**Types of Payments**
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$360,202
Travel and Lodging	$45,843
Consulting Fee	$30,412
Compensation for serving as faculty or as a speaker for an accredited or certified continuing education program	$10,500
Food and Beverage	$8,187
Other	$5,995

Research Payments

Dr. Rena D. Callahan, MD has received 2 research payments totaling $17,822.

Biography

Dr. Rena Callahan practices surgical oncology (cancer surgery), adult hematology, and adult oncology. On average, patients gave her a rating of 5.0 stars (out of 5). These areas are among Dr. Callahan's clinical interests: male breast cancer and metastatic breast cancer. She is professionally affiliated with UCLA Health. She accepts several insurance carriers, including Anthem, UnitedHealthcare, and Blue California. Dr. Callahan has an open panel in Santa Monica, CA according to UCLA Health. She attended the University of Pennsylvania School of Medicine and then went on to complete her residency at a hospital affiliated with Yale University and a hospital affiliated with the University of California, Los Angeles (UCLA). She has received distinctions including Super Doctors Southern California; Castle Connolly Top Doctors; and Super Doctors Southern California Rising Stars.