Mercedes Tomioka, MD

Mercedes Tomioka, MD

Internal Medicine

Affiliation

  • Hoag Medical Group
  • Hoag Physician Partners

Language

  • Spanish,
  • Japanese

About Dr. Tomioka

A native speaker of Spanish and conversational Japanese, Dr. Tomioka brings cultural diversity, excellent skills, and her compassionate nature to her profession as a physician. Her grandparents immigrated to Peru prior to World War II and that is where Dr. Tomioka spent her early years surrounded by family, which included many physicians. Always concerned about everyone around her, her family encouraged her to become a physician to fulfill her desire to help others.

Practicing since 2003, Dr. Tomioka chose a career in Internal Medicine as she truly appreciates the challenge. She enjoys being exposed to a broad variety of skills and applying her knowledge to help her patients. She is excited to lend her talent and innovative ideas to Hoag Medical Group.

Dr. Tomioka has extensive training and always pursues ways to improve her skills and knowledge. She attended medical school at Universidad Nacional Mayor de San Marcos in Lima, Peru, completed her residency in Internal Medicine at St. Barnabas Hospital (affiliated with The New York Hospital – Cornell Medical Center), and finished with a fellowship in Geriatrics at UC Davis.

Outside of work, Dr. Tomioka enjoys spending time with her husband and daughter. Her focus is on bringing new experiences to her daughter and they often travel and visit museums during their weekend excursions.

Conditions Treated

  • Abdominal Disorders
  • Abdominal Pain
  • Abnormal Bowel Movement
  • Abnormal Breast Milk
  • Abnormal Weight Loss
  • Abscess
  • Achalasia
  • Achilles Tendon Injury
  • Achilles Tendon Sprain
  • Acquired Immune Deficiency Syndrome
  • Acute Abdomen
  • Acute Carbon Monoxide Poisoning
  • Acute Gastritis
  • Acute Hepatitis C
  • Acute Ischemic Colitis
  • Acute Occupational Illness
  • Acute Occupational Injury
  • Acute Peptic Ulcer Disease
  • Acute Rhinosinusitis
  • Addiction
  • Addiction to Steroids
  • Addison's Anemia
  • Adenomatous Polyps
  • Adenovirus Infection
  • Adult Appendicitis
  • Adult Onset Asthma
  • Adverse Drug Reaction
  • Agammaglobulinemia
  • Aging
  • Alcohol Induced Mental Disorders
  • Alcohol Poisoning
  • Alcohol Use
  • Alcohol Withdrawal
  • Alcohol or Drug Blackouts
  • Alcohol-Induced Disorders
  • Alcoholism
  • Alkhurma hemorrhagic fever
  • Allergic Sinusitis
  • Alopecia Areata
  • Amphetamine Use Disorder
  • Anabolic Steroid Use
  • Anal Disorders
  • Anal Dysplasia
  • Anal Fissure
  • Anal Fistula
  • Anal Itching
  • Anal Pain
  • Anal Pap Smear
  • Anaplasmosis
  • Anemia
  • Angiodysplasia
  • Angular Cheilitis
  • Ankle Arthritis
  • Ankle Impingement
  • Ankle Infection
  • Ankle Pain
  • Antibiotic-Associated Clostridium Difficile Colitis
  • Anticoagulation Management
  • Aphthous Oral Ulcer
  • Argon Plasma Coagulation
  • Arm Arthritis
  • Artery Stenosis
  • Asthma
  • Asthma Management
  • Asymptomatic Bacteriuria
  • Atherosclerosis
  • Athlete's Foot
  • Athletic Pubalgia
  • Atrioventricular Septal Defect
  • Back Muscle Injury
  • Back Problems
  • Bacterial Infection in Mouth
  • Bacterial Infections
  • Bacterial Pink Eye
  • Balanitis
  • Beckwith-Wiedemann Syndrome
  • Bed Bug Bites
  • Bed Sores
  • Benign Chronic Pain Syndrome
  • Benign Neoplasm of the Digestive System
  • Benign Neoplasms of Skin
  • Benign Pancreatic Tumor
  • Benign Skin Lesion
  • Benzodiazepine Overdose
  • Beriberi
  • Bicycle Spoke Injury
  • Big Toe Pain
  • Bile Duct Disorder
  • Biliary Atresia
  • Biliary Tract Problem
  • Birthmarks
  • Bladder Diverticulum
  • Bladder Infection
  • Bleeding Ulcer
  • Blepharitis
  • Blister
  • Blood Clot
  • Boil
  • Borreliosis
  • Botanical Medicine
  • Botulism
  • Bowel And Bladder Management
  • Bowel Issues
  • Bradykinesia
  • Breast Lump
  • Broken Leg
  • Broken Rib
  • Bronchiolitis
  • Bronchitis
  • Bronchospasm
  • Brown Recluse Spider Bite
  • Bruised Face
  • Bruised Nose
  • Bruised Rib
  • Burn Blisters
  • Burn Injuries
  • Burning Sensation In Urine
  • Buttock Pain
  • CON-2672
  • Calf Strain
  • Campylobacter Enterocolitis
  • Cancer Prevention
  • Cancer-Related Diarrhea
  • Candida Esophagitis
  • Candidiasis of Skin and Nails
  • Cannabis Dependence
  • Cannabis Use Disorder
  • Cardiac Angina
  • Cardiac Arrhythmia
  • Cardiovascular Disease in Athletes
  • Cardiovascular Disease in Women
  • Carotidynia
  • Caustic Esophageal Stricture
  • Cecal Volvulus
  • Celiac Artery Compression Syndrome
  • Celiac Disease
  • Chalazion
  • Chemotherapy Side Effects
  • Chest Wall Pain
  • Chicken Pox
  • Chickenpox Vaccine
  • Chigger Bite
  • Chills
  • Cholecystitis
  • Choledochal Cyst
  • Cholelithiasis
  • Chronic Adenoid Infection
  • Chronic Carbon Monoxide Poisoning
  • Chronic Cough
  • Chronic Diarrhea
  • Chronic Earwax Blockage
  • Chronic Fatigue Syndrome
  • Chronic Idiopathic Constipation
  • Chronic Illness
  • Chronic Laryngitis
  • Chronic Mucocutaneous Candidiasis
  • Chronic Neck Pain
  • Chronic Occupational Illness
  • Chronic Pain
  • Chronic Pancreatitis
  • Chronic Postoperative Pain
  • Chronic Rhinitis
  • Clostridium Difficile Colitis
  • Cocaine Dependence
  • Coccygeal Pain
  • Colon Polyps
  • Colon and Rectal Cancer
  • Colonic Dysmotility
  • Color Changes in Nails
  • Combination Drug Dependence
  • Common Cold
  • Community Acquired Pneumonia
  • Congenital Aganglionic Megacolon
  • Congenital Heart Defect
  • Contractions of the Esophagus
  • Corns
  • Coronavirus
  • Cough
  • Cough Syncope
  • Cough-Variant Asthma
  • Crabs
  • Cramping
  • Cryptosporidium
  • Cuts
  • Cutting Back on Alcohol
  • Cyclic Vomiting Syndrome
  • Cyclosporiasis
  • Cyst
  • Cytomegalovirus
  • Dacryocystitis
  • Defecation Disorders
  • Dehydration
  • Delirium
  • Demodex Mites
  • Diabetic Nephropathy
  • Diaphragmatic Hernia
  • Diarrhea
  • Diffuse Esophageal Spasm
  • Digestive Problem
  • Digestive Tract Perforation
  • Disorders of Cornification 11
  • Disorders of Magnesium Metabolism
  • Diverticulitis
  • Drug Allergy
  • Drug Dependence and Addiction
  • Drug Induced Mental Disorders
  • Drug Reactions
  • Drug Use
  • Drug Withdrawal
  • Drug and Alcohol Dependence
  • Drug or Alcohol Relapse
  • Drug-Induced Pancreatitis
  • Dumping Syndrome
  • Duodenal Atresia
  • Duodenal Ulcer Disease
  • Duodenitis
  • Dysentery
  • Dyshydrosis
  • Dysnatremias
  • Dyspepsia
  • Dysphagia
  • E. Coli
  • Ear Ache
  • Ear Discharge
  • Ear Fullness
  • Ectropion
  • Elbow Pain
  • Elbow Problems
  • Elbow Sprain
  • Encopresis
  • Enlarged Lymph Nodes
  • Enteroatmospheric Fistula
  • Enterocutaenous Fistula
  • Enterohemorrhagic Escherichia Coli Infection
  • Enuresis
  • Environmental Exposure Evaluation
  • Eosinophilic Disease
  • Eosinophilic Esophagitis
  • Eosinophilic Gastroenteritis
  • Erysipelas
  • Erythema
  • Erythema Multiforme Major
  • Esophageal Atresia and Tracheoesophageal Fistula
  • Esophageal Diseases
  • Esophageal Diverticulum
  • Esophageal Fistula
  • Esophageal Impaction
  • Esophageal Motility
  • Esophageal Motility Disorder
  • Esophageal Obstruction
  • Esophageal Problems
  • Esophageal Ulcer
  • Esophageal Varices
  • Esophagitis
  • Exomphalos
  • Facial Pain
  • Family History of Heart Issues
  • Fatigue
  • Feeding Disorders
  • Femoral Hernia
  • Fertility Counseling
  • Fever
  • Fingernail Problem
  • Flushing
  • Folliculitis
  • Food Poisoning
  • Foot Callus
  • Foot Infection
  • Foreign Body Aspiration
  • Foreign Body Ingestion
  • Frailty
  • Frontal Headache
  • Frostbite
  • Fructose Intolerance
  • Functional Bowel Disease
  • Functional Gastrointestinal Disorder
  • Functional decline
  • Fungal Infection
  • Gallbladder Disease
  • Gallbladder Polyp
  • Gambling Addiction
  • Ganglion Cyst
  • Gas
  • Gastric Polyps
  • Gastric Volvulus
  • Gastroenteritis
  • Gastroesophageal Reflux Disease
  • Gastrointestinal Atony
  • Gastrointestinal Bleed
  • Gastrointestinal Conditions
  • Gastrointestinal Diseases
  • Gastrointestinal Fistula
  • Gastrointestinal Hemorrhage
  • Gastrointestinal Infections
  • Gastrointestinal Motility Disorders
  • Gastrointestinal Problem
  • Gastrointestinal Stromal Tumor
  • Gastrojejunal Ulcer
  • Gastroparesis
  • Gastroschisis
  • Gaucher Disease
  • Giardiasis
  • Gluteal Strain
  • Gluten-Free Diet
  • Gout
  • Groin Injury
  • Hair Disorders
  • Hallucinogen Dependence
  • Hamartomatous Polyposis
  • Hand Skin Problem
  • Hand Warts
  • Head Lice
  • Heart Attack Prevention
  • Heartburn
  • Heat Exhaustion From Salt Depletion
  • Heat Exhaustion From Water Depletion
  • Heat Illness
  • Helicobacter Pylori Infection
  • Hematochezia
  • Hemoptysis
  • Hemorrhoid External
  • Hemorrhoid Internal
  • Hemorrhoids
  • Henoch-Schonlein Purpura
  • Hepatitis
  • Hepatitis A
  • Hepatitis B
  • Hepatitis C
  • Hepatitis D
  • Hepatitis E
  • Heredopathia Atactica Polyneuritiformis
  • Herpes Labialis
  • Herpes Simplex Virus
  • Herpes Zoster
  • Hiatal Hernia
  • High Cholesterol
  • Hip Pointer
  • Holiday Depression & Stress
  • Hordeolum
  • Human Anaplasmosis
  • Hydrocele
  • Hymenoptera Sting Allergy
  • Hyperplastic Polyps
  • Hyperplastic Sinusitis
  • Hypertriglyceridemia
  • Hypocalcemia
  • Hypochondriasis
  • Hypoglycemia
  • Idiopathic Erythroderma
  • Ileitis
  • Illness
  • Imperforate Anus
  • Infected Hair on Scrotum
  • Infected Skin
  • Infections in solid organ transplantation
  • Influenza
  • Inguinal Hernia
  • Insect Bite
  • Insect Sting Allergies
  • Interstitial Cystitis
  • Intertrigo
  • Intestinal Abscess
  • Intestinal Failure
  • Intestinal Malabsorption
  • Intestinal Ulcer
  • Intractable Hiccups
  • Intussusception
  • Iron Deficiency Anemia
  • Irritable Bowel Syndrome
  • Isovaleric Acidemia
  • Itchy Scalp
  • Joint Sprain
  • Keratoderma
  • Kidney Atrophy
  • Knee Injury
  • LGBT Care
  • Laceration
  • Lactose Intolerance
  • Large Local Reaction
  • Large Local Reaction to Fire Ant Bite
  • Laryngitis
  • Lateral Epicondylitis
  • Latrogenic Exfoliative Dermatitis
  • Leaky Gut Syndrome
  • Leg Cramps
  • Leg Swelling
  • Li-Fraumeni Syndrome
  • Lichen Ruber Planus
  • Light Headed
  • Lipid Disorders
  • Lipoma
  • Liver Abscess
  • Liver Masses
  • Lodged Foreign Body
  • Loss Of Appetite
  • Lower Extremity Pain
  • Lower Extremity Swelling
  • Lower Gastrointestinal Bleeding
  • Lumbar Sprain
  • Lysergic Acid Diethylamide
  • Magnesium Metabolism Disorder
  • Male Fertility
  • Malignant Hypertension
  • Malignant Hyperthermia
  • Mallory-Weiss Tear
  • Malnutrition
  • Marijuana Abuse
  • Marijuana Use
  • Measles
  • Meckel's Diverticulum
  • Meconium Ileus
  • Medical Device Infections
  • Medication Induced Constipation
  • Melena
  • Membranous Nephropathy
  • Men's Health
  • Menopause
  • Menstrual Migraine
  • Mesenteric Adenitis
  • Mesenteric Ischemia
  • Mesenteric Panniculitis
  • Metabolic Syndrome
  • Microalbuminuria
  • Microscopic Colitis
  • Mild Hypothermia
  • Mitochondrial Diseases
  • Motion Sickness
  • Multiple Drug Misuse
  • Muscle Cramps
  • Muscle Pain
  • Mycosis Fungoides
  • Myocarditis
  • Myoclonus
  • Nasal Allergies
  • Nasal Congestion
  • Nasal Tumor
  • Nasopharyngitis
  • Nausea
  • Neck Problems
  • Neck Strain
  • Night Sweats
  • Nightmares
  • Non-Celiac Gluten Sensitivity
  • Nose Inflammation
  • Obesity
  • Occipital Neuralgia
  • Onychia
  • Opioid Dependence and Addiction
  • Opioid Induced Constipation
  • Opioid Misuse
  • Opioid Overdose
  • Opioid Tapering or Discontinuation
  • Opioid Withdrawal
  • Opioids and Acute Pain
  • Oral Allergy Syndrome
  • Organophosphate Poisoning
  • Osteitis Deformans
  • Osteoporosis
  • Otalgia
  • Oxygen-Dependent
  • Pain Behind Ear
  • Pain In Extremities
  • Pancreas Problem
  • Pancreatic Diseases
  • Pancreatic Neuroendocrine Tumor
  • Pancreaticobiliary Disease
  • Pancreatitis
  • Pancreatobiliary Disease
  • Paraesophageal Diverticulum
  • Parapsoriasis
  • Parastomal Hernia
  • Paronychia
  • Partial Thickness Burn
  • Pathological Gambling
  • Peanut Allergy
  • Pemphigoid
  • Penicillin Allergy
  • Peritonitis
  • Peritonitis from Peritoneal Dialysis
  • Persistent Singultus
  • Pes Cavus
  • Pharyngeal Pouch
  • Phlebitis
  • Physical Abuse
  • Physiologic Breast Discharge
  • Pigmented Lesions
  • Pityriasis Rosea
  • Pityriasis Versicolor
  • Pneumococcal Vaccine
  • Poison Ivy Exposure
  • Poison Oak Exposure
  • Pollen Allergy
  • Polyarteritis Nodosa
  • Polyneuropathy due to Alcohol and Drugs
  • Polyp Screening
  • Post-Nasal Drip
  • Postcholecystectomy Syndrome
  • Postnasal Drip
  • Pouchitis
  • Pre-Sports Physical
  • Pre-Travel Checkup
  • Prescription Medicine Misuse
  • Primary Biliary Cholangitis
  • Primary Sclerosing Cholangitis
  • Proctalgia Fugax
  • Proctitis
  • Prurigo
  • Pruritus
  • Pyloric Stenosis
  • Pyoderma Gangrenosum
  • Radial Head Subluxation
  • Radiation Colitis
  • Radiation Proctitis
  • Radiation Therapy Side Effects
  • Rash from Swimsuit
  • Raynaud's Disease
  • Rectal Bleeding
  • Rectal Prolapse
  • Red Burning Skin Syndrome
  • Removal of Short Intestine
  • Renal Colic
  • Renal Cyst
  • Renal Osteodystrophy
  • Respiratory Syncytial Virus
  • Respiratory Viruses
  • Retropharyngeal Abscess
  • Rhinorrhea
  • Rib Pain
  • Risk Factor Management
  • Root Nerve Compression
  • Rosacea
  • Roseola
  • Rotavirus Gastroenteritis
  • Salivary Gland Disorders
  • Salivary Gland Swelling
  • Salivary Gland Tumor
  • Salmonella
  • Sarcoptic Mange
  • Scapular Fracture
  • Schatzki's Ring
  • Scrotal Abscess
  • Seasonal Affective Disorder
  • Seborrheic Keratosis
  • Selective IgA Deficiency
  • Selective IgM Deficiency
  • Septic Shock
  • Sexual Abuse Counseling
  • Sexual Dysfunction
  • Sexual and Gender Identity Disorders
  • Shin Pain
  • Short Bowel Syndrome
  • Shoulder Blade Pain
  • Shoulder Bursitis
  • Shoulder Disorders
  • Shoulder Fracture
  • Shoulder Impingement Syndrome
  • Shoulder Tenosynovitis
  • Side Effects of Chemotherapy
  • Sigmoid Volvulus
  • Silicone Problems
  • Sinonasal Tumors
  • Sinus Tumor
  • Sjogren's syndrome
  • Skeletal Dysplasia
  • Skin Discoloration
  • Skin Disease
  • Skin Tumors
  • Skull Fracture
  • Sleep Apnea
  • Sleep Walking
  • Slow Weight Gain
  • Small Bowel Tumors
  • Small Intestinal Bacterial Overgrowth
  • Small Intestinal Cancer
  • Smoking
  • Smoking Relapse
  • Somnambulism
  • Sorbitol Intolerance
  • Sphincter of Oddi Dysfunction
  • Spigelian Hernia
  • Spleen Injury
  • Splinter
  • Sprain
  • Status Epilepticus
  • Stellate Ganglion Block
  • Stenosis
  • Steroid-Induced Rosacea-like Dermatitis
  • Stiff Neck
  • Stiff-Man Syndrome
  • Stiffness
  • Still's Disease
  • Stomach Ache
  • Stomach Bloating
  • Stomach Diseases
  • Stomach Tumor
  • Stomatitis
  • Strain
  • Strangulated Hernia
  • Strep Throat
  • Stress
  • Stress Fracture
  • Stress Management
  • Stretch Marks
  • Stricture or Kinking of Ureter
  • Subglottic Stenosis
  • Sulfonamide Allergy
  • Sunburn
  • Superior Labral Tear from Anterior to Posterior
  • Superior Semicircular Canal Dehiscence
  • Swallowed Foreign Body
  • Sweat Gland Disorders
  • Swelling In Legs
  • Swollen Ankles
  • Symptomatic Menopause
  • Tapeworm
  • Tear Duct Disorders
  • Teenage Pregnancy
  • Telogen Effluvium
  • Tension Headache
  • Testicle Pain
  • Throbbing Headache
  • Thrombocytopenia
  • Tinea Corporis
  • Tinea Cruris
  • Tingling
  • Tonsillitis
  • Tonsillolith
  • Top Of Foot Pain
  • Toxic Megacolon
  • Toxic Shock Syndrome
  • Travel Medicine
  • Traveler's Diarrhea
  • Tuberose Sclerosis
  • Tumor Benign
  • Ulnar Nerve Compression
  • Underarm Pain
  • Unexplained Medical Symptoms
  • Upper Esophageal Sphincter Dysfunction
  • Upper Gastrointestinal Bleeding
  • Uterine Myoma
  • Vascular Insufficiency
  • Vascular Tumors
  • Vasomotor Symptoms
  • Vasospastic Disorders
  • Vein Diseases
  • Venous Disease
  • Venous Hypertension
  • Venous Ulcer
  • Ventral Hernia
  • Viral Exanthem
  • Vitiligo
  • Vomiting
  • Vulvar Abscess
  • Weight Control
  • Weight Management
  • Wellness Care
  • West Nile Virus
  • Whipple's Disease
  • Workplace injuries
  • Worry
  • Wound Healing
  • Wrist Fractures
  • Wrist Ligament Injuries
  • Wrist Pain
  • Writer's cramp
  • Yeast infections
  • Yersinia Enterocolitis
  • Youth Sports Injury
  • Zollinger-Ellison Syndrome
  • mucocele
  • mumps
  • muscular soreness
  • recurrent patellar dislocation
  • shedding of Skin

Insurance

Check to see if your insurance is accepted by this health care provider.

Please contact your insurance provider to confirm if your health plan is accepted.

  • Aetna - 7691697
  • Anthem - Z64420
  • Blue Shield - 100036422017
  • Cigna - 8576503040
  • Scan - 996-135989
  • United Healthcare - 0326600044

National Provider ID (NPI): 1275639262

Education

  • Medical Education - Universidad Nacional Mayor de San Marcos (Medical Doctor)
  • Internship - St. Barnabas Hospital (Internal Medicine)
  • Residency - National Hospital (Internal Medicine)
  • Fellowship - University of CA Davis Med Center (Geriatrics)
  • Residency - St. Barnabas Hospital (Internal Medicine)

Board Certification

  • American Board of Internal Medicine - Geriatric Medicine
  • American Board of Internal Medicine - Internal Medicine

Affiliations

  • Hoag Medical Group
  • Hoag Physician Partners

Area of Focus

  • Internal Medicine