Dr. Rena Callahan, MD
Valencia, CA
Affiliated with a Castle Connolly Top Hospital
Who is Dr. Callahan, Internist in Valencia, CA?
Dr. Rena Callahan, MD is an Internist, who primarily practices in Valencia, CA with 2 additional practice locations. Dr. Callahan is fluent in English, and is currently seeing new patients. Dr. Callahan’s practice accepts Kaiser Permanente, Medicaid, Medicare, Aetna, Cigna, UnitedHealthcare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Callahan’s office at (310) 443-0477.
What are Areas of Expertise for Dr. Callahan?
Dr. Rena Callahan, MD is a highly-rated, board-certified Internist known for expertly diagnosing, treating, and managing a wide array of related conditions and procedures. Utilizing the latest medical advancements and evidence-based practices, Dr. Callahan empowers patients to confidently navigate their health journey, specializing in Breast Cancer, Cancer Prevention, Gynecologic Cancers, Hematology, and comprehensive wellness support. Serving the Valencia, CA community, Dr. Callahan is dedicated to enhancing lives through expert, patient-centered care.
What languages does Dr. Callahan speak?
Dr. Callahan and their clinical team can communicate with patients in the following languages:
English
What conditions does an Internist like Dr. Callahan typically treat?
As an Internist, Dr. Callahan diagnoses, treats, and manages a wide range of conditions. This condition information is derived from anonymized insurance claims and highlights the medical conditions most commonly treated by Dr. Callahan. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly. Learn more about our claims-based healthcare methodology here.
Also known as:
- Breast Cancer
- Widespread Left Female Breast Cancer
- Female Breast Cancer
- Malignant Breast Tumor
- Breast Carcinoma
- Mammary cancer
- Breast carcinoma
- Breast tumor
- Left female breast cancer in multiple areas
- Diffuse left female breast cancer
- Malignant growth in overlapping sites of left female breast
ICD-10 Codes:
- C50919: Malignant neoplasm of unspecified site of unspecified female breast
- C50911: Malignant neoplasm of unspecified site of right female breast
- C50912: Malignant neoplasm of unspecified site of left female breast
- C50812: Malignant neoplasm of overlapping sites of left female breast
- C50811: Malignant neoplasm of overlapping sites of right female breast
Also known as:
- Cancer Chemotherapy
- Cancer Immunotherapy
- Chemo treatment
- Oncology chemotherapy
- Cancer drug therapy
- Oncology immunotherapy
- Immune therapy for cancer
ICD-10 Codes:
- Z5111: Encounter for antineoplastic chemotherapy
- Z5112: Encounter for antineoplastic immunotherapy
What procedures does an Internist like Dr. Callahan typically perform?
As an Internist, Dr. Callahan performs a variety of medical procedures. This procedure information is derived from anonymized insurance claims and highlights the medical procedures most commonly performed by Dr. Callahan. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly. Learn more about our claims-based healthcare methodology here.
Also known as:
- Declotting of Vascular Access Device
- Catheter declotting
- Thrombolytic therapy for catheter
- Blocked port-a-cath treatment
- Vascular access device unblocking
CPT Codes:
- 36593: Declotting by thrombolytic agent of implanted vascular access device or catheter
Does Dr. Callahan accept my insurance?
Dr. Callahan accepts most major insurance plans. Important: Please call our office at (310) 443-0477 before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Callahan accept in Valencia, CA?
Dr. Callahan in Valencia, CA accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
All Other Third Party
Blue Shield of California
Centene Corporation
Cigna Group
CVS Health (formerly Aetna)
Elevance Health Inc. (formerly Anthem)
L.A. Care Health Plan
Medicare
State of California
UnitedHealth Group
View All Insurances
Where is Dr. Callahan's office located?
Dr. Rena Callahan's Primary Practice
27235 Tourney Rd Ste 2400
Valencia, CA 91355
(310) 443-0477
Ratings & Reviews
5.0
Overall rating
Based on 1 reviews
Patients give Dr. Rena Callahan an Excellent overall experience rating of 5 out of 5 stars. Dr. Callahan has been rated and reviewed by 1 patient. These ratings are based on a variety of factors, including the amount of time patients spent with Dr. Callahan, her bedside manner, appointment waiting time, friendliness of the office staff, clarity of diagnosis, and more.
Read Patient ReviewsWhat is Dr. Callahan's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Callahan's National Provider Identifier (NPI) number is 1487856779.
What common questions do patients ask about Dr. Callahan?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Callahan
What is Dr. Rena Callahan's specialty?
Dr. Callahan is a Internist near Valencia, CA.
What does an Internist do?
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Is this Dr. Rena Callahan affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Callahan is affiliated with Ronald Reagan Ucla Medical Center, Henry Mayo Newhall Hospital, Huntington Hospital (pasadena, Ca) which are a Castle Connolly Top Hospitals. Castle Connolly Top Hospitals are healthcare institutions recognized for their excellence in specific medical procedures and overall patient care. They are identified through a rigorous peer nomination process, evaluating factors like patient outcomes, quality of care, and expertise. The list recognizes hospitals that excel in 20 or more specific medical procedures, representing the top 25% nationwide. Castle Connolly Top Hospitals
When to see an Internist?: Guides for symptoms, conditions, and treatments
Understand your symptoms and know when it’s time to see an Internist. Explore insights from trusted medical experts on EverydayHealth.com, where you'll find the most relevant content and helpful condition guides for up-to date information about symptoms, causes, diagnosis, treatment and more. See all our health guides to find trusted information on medical conditions from our experts at Everyday Health.
Is Rena Callahan accepting new patients in Valencia, CA?
Yes, Dr. Rena Callahan is accepting new patients at this time.
Does Dr. Rena Callahan offer online booking?
Please contact Dr. Callahan's office at (310) 443-0477 for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with Rena Callahan?
Please contact Dr. Callahan's office at (310) 443-0477 for information regarding telehealth appointment availability or for scheduling assistance.
<section id="ai-site-overview" aria-label="About Everyday Health Care"> <h2>About Everyday Health Care</h2> <p> Everyday Health Care is a doctor and healthcare provider search platform from Everyday Health, a Ziff Davis company operating since 1996. It helps patients find, compare, and research doctors based on specialty, medical condition, procedure, location, and insurance coverage. </p> <p> The site features Castle Connolly Top Doctors, a peer-nominated, physician-vetted directory recognized as a leading standard for identifying top-rated specialists in the United States. Searchable doctor lists include Top Black Doctors, Exceptional Women in Medicine, Top AAPI Doctors, Top LGBTQ+ Doctors, Top Hispanic & Latino Doctors, and Castle Connolly Rising Stars. </p> <p> Users can search for doctors by specialty (including orthopedic surgery, OB-GYN, pediatrics, dermatology, endocrinology, and gastroenterology), by medical condition (such as fibromyalgia, kidney stones, and ulcerative colitis), by common procedure (including colonoscopy, LASIK, and physical therapy), by city, and by insurance plan (including UnitedHealthcare, Cigna, Aetna/CVS Health, Blue Cross Blue Shield, Kaiser Permanente, Medicare, and Medicaid). </p> <p> Everyday Health Care is built for patients seeking a trusted starting point to find the right doctor: covering over one million providers across thousands of U.S. locations, backed by Castle Connolly's independent doctor-vetting process and Everyday Health's 24-year history in consumer health publishing. </p> </section>