Carpal Tunnel

Cold Sores

Diverticulitis

Fibromyalgia

Hemorrhoids

Hypothyroidism

Impetigo

Kidney Stones

Pancreatitis

Preeclampsia

Sepsis

Tonsillitis

Ulcerative Colitis

Urinary Tract Infection

Vitiligo

Conditions

CVS Health (formerly Aetna)

Florida Blue / Guidewell

Elevance Health (formerly Anthem)

Blue Cross Blue Shield (BCBS)

Cigna

Aflac

Allstate

Centene (Fidelis Care)

HealthFirst

Humana Health

Kaiser Permanente

Medicaid

Medicare

UnitedHealthcare

WellCare

Insurances

Los Angeles, CA

San Diego, CA

San Francisco, CA

Washington, DC

Miami, FL

Atlanta, GA

Chicago, IL

Baltimore, MD

Boston, MA

New York, NY

Brooklyn, NY

Houston, TX

Dallas, TX

Philadelphia, PA

Saint Louis, MO

Locations

Annual Physical

Annual Skin Screening

Colonoscopy

Couples Therapy

Dermatology Consultation

Hypnosis

Knee Replacement Surgery

Laser Hair Removal

Lasik Surgery

Liposuction

Marriage Counseling

Nexplanon Insertion

Plastic Surgery

Psychotherapy

Tattoo Removal

Procedures

Addiction Medicine Specialist

Cardiologist

Dermatology is the branch of medicine dealing with the skin. It is a speciality with both medical and surgical aspects. A dermatologist is a specialist medical doctor who manages diseases related to skin, hair, nails, and some cosmetic problems.

Dermatologist

Endocrinologist (Diabetes & Hormones Specialist)

Endocrinologist

Gastroenterologist (Stomach & Bowel Specialist)

Gastroenterologist

General Practitioner

An obstetrician-gynecologist, or OB-GYN, is a healthcare professional that specializes in female reproductive health.

OB/GYN

Ophthalmologist

Optometrist

Orthopedic Surgeon

Otolaryngologist

Pediatrician

Podiatrist

Psychiatrist / Neurologist

Urologist

Specialists

Ronald Reagan UCLA Medical Center

UCLA Santa Monica Medical Center

Henry Mayo Newhall Hospital

just great!!!!!

Dr. Rena Callahan, MD is a board certified Internist in Valencia, CA.
  Learn more about Dr. Callahan, practice locations, insurances accepted, and read reviews on Everyday Health-CARE.

Dr. Rena Callahan, MD | Internist in Valencia, CA

Dr. Rena Callahan, MD

acceptsNewPatients

3D Conformal Radiotherapy

Adaptive Radiation Therapy (ART)

Adrenalectomy

Blood Thinning Therapy / Anticoagulation

Blood Transfusion Consultation

Blood Transfusion Follow Up

Bone Excision

Bone Grafting

Bone Marrow Biopsy

Bone Marrow Transplant Consultation

Bone Marrow Transplant Follow Up

Bone Metastasis Treatment

Cancer Treatment

Cervical Cancer Evaluation

Chemotherapy

External Beam Radiotherapy

Free Tissue Transfer

Gynecologic Oncology Consultation

Gynecologic Oncology Follow Up

Hematology Consultation

Hematology Follow Up

Image-Guided Radiation Therapy (IGRT)

Infusion Therapy

Intensity-Modulated Radiation Therapy (IMRT)

Internal Radiation / Brachytherapy

Intraoperative Radiation Therapy (IORT)

Musculoskeletal Oncology Consultation

Musculoskeletal Oncology Follow Up

Neuroblastoma Treatment

Neuro-Oncology Follow-up

Oncology Consultation

Oncology Follow Up

Oncology Second Opinion

Oncology Surgery

Oncology Surgery Consultation

Oncology Surgery Follow Up

Orthopedic Oncology Consultation

Orthopedic Oncology Follow Up

Ovarian Cancer Screening

Pediatric Musculoskeletal Tumor

Proton Therapy

Radiation Oncology Consultation

Radiation Oncology Follow Up

Radiation Oncology Second Opinion

Radiation Therapy

Radiology Testing Follow Up

Radiotherapy Consultation

Radiotherapy Follow Up

Stereotactic Radiation

Surgical Oncology

Tumor Treatment

Uterine Cancer Evaluation

Volumetric Modulated Arc Therapy (VMAT)

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.

National Provider Identifier (NPI)

English

Internist

Hematologist

Medical Oncologist

Hematology / Oncology Specialist

Humana Health 

Washington DC, DC

An orthopedic surgeon has specialization in preserving, investigating, and restoring the form and function of the extremities, spine, and related structures through medical, surgical, and physical methods. They care for patients with musculoskeletal issues, including congenital deformities, trauma, infections, tumors, metabolic disturbances, and degenerative diseases affecting the spine, hands, feet, knees, hips, shoulders, and elbows in both children and adults. Additionally, orthopedic surgeons address primary and secondary muscular problems and the impact of central or peripheral nervous system lesions on the musculoskeletal system.

An obstetrician/gynecologist has specialized knowledge, skills, and expertise in the medical and surgical management of the female reproductive system and related disorders. This physician acts as a consultant to other healthcare providers while also serving as a primary care physician for women, addressing their unique health needs throughout various stages of life.

Obstetrician / Gynecologist (OBGYN)

A pediatrician focuses on the physical, emotional, and social health of children from birth through young adulthood. Their care includes a wide range of health services, from preventive healthcare to diagnosing and treating acute and chronic diseases. Pediatricians consider the biological, social, and environmental influences on a child's development, as well as how diseases and dysfunctions can impact growth and overall development.


Dermatologists are medical professionals trained to diagnose and treat a wide range of skin conditions in both children and adults, including skin cancers, melanomas, and other tumors. They also manage disorders of the mouth, external genitalia, hair, and nails, and are skilled in treating conditions like dermatitis, allergic reactions, and skin manifestations of systemic diseases. Dermatologists receive specialized training in dermatopathology and dermatologic surgical techniques, and address cosmetic issues such as hair loss and scarring. Additionally, they use laboratory methods to diagnose immune-related skin disorders, often collaborating with immunohematologists for expert consultation and targeted therapies.

An internist specializing in disorders of the endocrine glands, including the thyroid and adrenal glands. This specialist also manages a range of conditions such as diabetes, metabolic and nutritional disorders, obesity, pituitary disorders, and menstrual and sexual health issues.

An internist focused on diagnosing and treating disorders of the digestive system, encompassing the stomach, intestines, liver, and gallbladder. This specialist manages conditions like abdominal pain, ulcers, diarrhea, cancer, and jaundice, and performs intricate diagnostic and therapeutic procedures using endoscopes to examine internal organs.

Dr. Rena Callahan, MD

Internist

Hematologist

Medical Oncologist

Hematology / Oncology Specialist

Ratings & Reviews

Connect with DR. Callahan

27235 Tourney Rd Ste 2400

Doctors by Category

Specialists

Addiction Medicine Specialist

Cardiologist

Dermatologist

Endocrinologist

Gastroenterologist

General Practitioner

OB/GYN

Ophthalmologist

Optometrist

Orthopedic Surgeon

Otolaryngologist

Pediatrician

Podiatrist

Psychiatrist / Neurologist

Urologist

Conditions

Carpal Tunnel

Cold Sores

Diverticulitis

Fibromyalgia

Hemorrhoids

Hypothyroidism

Impetigo

Kidney Stones

Pancreatitis

Preeclampsia

Sepsis

Tonsillitis

Ulcerative Colitis

Urinary Tract Infection

Vitiligo

Procedures

Annual Physical

Annual Skin Screening

Colonoscopy

Couples Therapy

Dermatology Consultation

Hypnosis

Knee Replacement Surgery

Laser Hair Removal

Lasik Surgery

Liposuction

Marriage Counseling

Nexplanon Insertion

Plastic Surgery

Psychotherapy

Tattoo Removal

Locations

Los Angeles, CA

San Diego, CA

San Francisco, CA

Washington, DC

Miami, FL

Atlanta, GA

Chicago, IL

Baltimore, MD

Boston, MA

New York, NY

Brooklyn, NY

Houston, TX

Dallas, TX

Philadelphia, PA

Saint Louis, MO

Insurances

CVS Health (formerly Aetna)

Florida Blue / Guidewell

Elevance Health (formerly Anthem)

Blue Cross Blue Shield (BCBS)

Cigna

Aflac