Dr. Rena Callahan, MD
Valencia, CA
Accepting patients
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. She is board certified. Dr. Callahan is fluent in English, and is currently seeing new patients. Dr. Callahan’s practice accepts Cigna, Kaiser Permanente, Medicaid, Medicare, UnitedHealthcare, Aetna 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 or 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, or 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 Dr. Callahan treat?
As a 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.
Also known as:
- Breast Cancer
- Widespread Left Female Breast Cancer
- Upper-Outer Quadrant Right Female Breast Cancer
- Central Left Female Breast Cancer
- Upper-Inner Quadrant Left Female Breast Cancer
- Central Right Female Breast Cancer
- Early Breast Cancer of the Left Breast
- Lower-Outer Quadrant Right 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
- Right female breast cancer upper-outer
- Upper-outer right female breast tumor
- Malignant growth in upper-outer right female breast
- Left female breast central tumor
- Malignant growth in central left female breast
- Left female breast cancer upper-inner
- Upper-inner left female breast tumor
- Malignant growth in upper-inner left female breast
- Right female breast central tumor
- Malignant growth in central right female breast
- Intraductal carcinoma in situ left breast
- Precancerous cells left breast
- Non-invasive breast cancer left breast
- DCIS left breast
- Right female breast cancer lower-outer
- Lower-outer right female breast tumor
- Malignant growth in lower-outer right 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
- C50411: Malignant neoplasm of upper-outer quadrant of right female breast
- C50412: Malignant neoplasm of upper-outer quadrant of left female breast
- C50112: Malignant neoplasm of central portion of left female breast
- C50212: Malignant neoplasm of upper-inner quadrant of left female breast
- C50111: Malignant neoplasm of central portion of right female breast
- C50819: Malignant neoplasm of overlapping sites of unspecified female breast
- D0512: Intraductal carcinoma in situ of left breast
- C50511: Malignant neoplasm of lower-outer quadrant 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
Also known as:
- Secondary Bone Cancer
- Bone Cancer
- Metastatic bone cancer
- Cancer spread to bone
- Bone metastases
ICD-10 Codes:
- C7951: Secondary malignant neoplasm of bone
Also known as:
- Chronic Lymphocytic Leukemia
- Chronic Lymphocytic Leukemia Treatment (PDQ®)
- CLL
- B-cell chronic lymphocytic leukemia
- Lymphocytic leukemia
ICD-10 Codes:
- C9110: Chronic lymphocytic leukemia of B-cell type not having achieved remission
Also known as:
- Age-Related Osteoporosis
- Fractures
- Osteoporosis
- Senile Osteoporosis
- Primary Osteoporosis
- Bone Thinning from Aging
ICD-10 Codes:
- M810: Age-related osteoporosis without current pathological fracture
Also known as:
- Ovarian Cancer
- Cancer of the ovary
- Ovarian carcinoma
- Female reproductive cancer
ICD-10 Codes:
- C563: Malignant neoplasm of bilateral ovaries
Also known as:
- Iron Deficiency Anemia
- Anemia
- Iron
- Anemia from Iron Lack
- Low Iron Anemia
- Sideropenic Anemia
ICD-10 Codes:
- D509: Iron deficiency anemia, unspecified
Which procedures does Dr. Callahan perform as a Internist?
As a Internist, procedures performed by an Dr. Rena Callahan may include:
- Ambulatory Care Consultation
- Annual Check Up
- Annual Physical
- Aromatherapy
- Bladder and Bowel Management
- Blood Pressure Testing
- Bowel and Bladder Management
- Certified Medical Examination for Commercial Driver / Vessel Master
For detailed information, please contact Dr. Callahan's office.
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
Cigna
City of Los Angeles
CVS Health (formerly Aetna)
Directors Guild of America Employees
Elevance Health Inc. (formerly Anthem)
Medicare
UnitedHealthcare
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.
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.
Contact Dr. Callahan to book an appointment today.Is this Dr. Rena Callahan affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Callahan is affiliated with Ronald Reagan UCLA Medical Center, UCLA Santa Monica Medical Center, Henry Mayo Newhall Hospital 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
Where can I learn more about Internist?
Explore Internist with 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.
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