Dr. Willis J. Chang
- Gender: Male
- Experience: 35 years
- Graduated from: University Of Hawaii John A. Burns School Of Medicine
- Graduation year: 1986
- Sole propriator: No
- NPI: 1558306720
Dr. Willis J. Chang M.D.
Infectious Disease Specialist
He is located at 91-2139 Fort Weaver Road #213 in Ewa Beach, HI 96706. Can help patients with the following: Coronavirus, Cystitis, Encephalitis, Peptic Ulcer, Strep Throat, Typhoid Fever. His National Provider Identifier (NPI) number is 1558306720. Appointment can be made via the phone number (808) 671-2456. He is affiliated with 1 practices and 1 hospitals.
Conditions treated
Dr. Willis Chang, being an infectious disease specialist, treats the following conditions. Please be advised that this list may not be complete. For the full list of conditions treated, consult directly with Dr. Willis J. Chang.
- Abdominal Pain
- Acquired Immunodeficiency Syndrome (AIDS)
- Acute Pain
- Anemia
- Anthrax
- Arthritis
- Asthma
- Atherosclerosis
- Bacterial Vaginosis
- Bladder Control
- Boils
- Botulism
- Bronchitis
- Brucellosis
- Cancer
- Candida Auris
- Cat Scratch Disease
- Cellulitis
- Chagas Disease
- Chest Pain
- Chickenpox
- Chlamydia
- Cholecystitis
- Cholera
- Chronic Obstructive Pulmonary Disease (COPD)
- Chronic Rhinitis
- Common Cold
- Constipation
- Coronavirus
- Cryptococcosis
- Cystitis
- Cytomegalovirus (CMV)
- Dengue Fever
- Diarrhea
- Diphtheria
- E. Coli Infection
- Eastern Equine Encephalitis (EEE)
- Ebola Hemorrhagic Fever
- Edema
- Encephalitis
- Endocarditis
- Epididymitis
- Fever
- Fifth Disease
- Food Poisoning
- Gangrene
- Gastroesophageal Reflux Disease (GERD)
- General Care
- Genital Herpes
- Giardiasis
- Gonorrhea
- Guinea Worm Disease
- Hand, Foot, and Mouth Disease (HFMD)
- Headache
- Heart Disease
- Helicobacter Pylori Infection
- Hepatitis A (HAV)
- Hepatitis B (HBV)
- Hepatitis C (HCV)
- Herpes Simplex Virus
- Hiatal Hernia
- High Blood Pressure
- Histoplasmosis
- Hot Flashes
- Human Immunodeficiency Virus (HIV)
- Human Papillomavirus (HPV)
- Hyperlipidemia
- Hyponatremia
- Impetigo
- Infectious Diseases
- Infectious Mononucleosis
- Influenza
- Inguinal Hernia
- Leishmaniasis
- Leprosy
- Leptospirosis
- Listeriosis
- Lyme Disease
- Mad Cow Disease
- Malaria
- Measles
- Meningitis
- Migraine
- Mumps
- Nail Fungus
- Nausea and Vomiting
- Necrotizing Fasciitis (NF)
- Neutropenia
- Obesity
- Osteomyelitis
- Osteoporosis
- Peptic Ulcer
- Pinworm Infection
- Pityriasis Rosea
- Pneumonia
- Polio
- Prescription Refill
- Rabies
- Rocky Mountain Spotted Fever (RMSF)
- Roseola
- Rubella
- Salmonella Food Poisoning
- Scabies
- Scarlet Fever
- Schistosomiasis
- Sepsis
- Severe Acute Respiratory Syndrome (SARS)
- Sexually Transmitted Diseases (STDs)
- Smallpox
- Sore Throat
- Staph Infection
- Stomach Flu
- Strep Throat
- Swine Flu
- Syphilis
- Tetanus
- Thrush
- Tonsillitis
- Toxic Shock Syndrome (TSS)
- Toxoplasmosis
- Trichinosis
- Tuberculosis (TB)
- Typhoid Fever
- Upper Respiratory Infection (URI)
- Urethritis
- Urinary Tract Infection (UTI)
- Valley Fever
- Viral Hemorrhagic Fever (VHF)
- West Nile Virus
- Whooping Cough
- Yaws
- Yeast Infection
- Yellow Fever
- Zika Virus
ACA Marketplace (Obamacare/HealthCare.gov) plan networks
Insurers selling ACA Marketplace (HealthCare.gov) plans list Dr. Willis J. Chang as in-network for the following 2026 plans.
Health plans
HMSA
Network data as of Sep 14, 2026, as reported by the insurer.
Show all 7 plans from HMSA
| Plan | Plan type | Network tier | New patients |
|---|---|---|---|
| HMSA Bronze PPO I | PPO · Expanded Bronze | Preferred Provider Plan | Accepting new patients |
| HMSA Bronze PPO II HSA | PPO · Expanded Bronze | Preferred Provider Plan | Accepting new patients |
| HMSA Catastrophic Plan | PPO · Catastrophic | Preferred Provider Plan | Accepting new patients |
| HMSA Gold PPO I | PPO · Gold | Preferred Provider Plan | Accepting new patients |
| HMSA Gold PPO II | PPO · Gold | Preferred Provider Plan | Accepting new patients |
| HMSA Platinum PPO | PPO · Platinum | Preferred Provider Plan | Accepting new patients |
| HMSA Silver PPO | PPO · Silver | Preferred Provider Plan | Accepting new patients |
This covers ACA Marketplace plans only, as reported by each insurer. It does not include employer, Medicare Advantage, or state-run exchange plans, and a plan missing from this list does not mean Dr. Willis J. Chang is out of network. Insurer directories can be out of date, so always confirm with the insurer and the office before your visit.
Medicare Enrollment
Dr. Willis J. Chang is enrolled to bill Medicare as a Practitioner - Infectious Disease (also registered under: Practitioner - Internal Medicine) .
Medicare practice location(s) (city/state/zip only, as reported to Medicare):
- AIEA, HI, 96701-4713
- WAIPAHU, HI, 96797-1922
Based on Medicare's public enrollment records as of Jul 17, 2026. This reflects Medicare fee-for-service enrollment only and says nothing about other insurance, quality, outcomes, or board certification.
Studies
UNIVERSITY OF HAWAII JOHN A. BURNS SCHOOL OF MEDICINE
Graduated in 1986Additional Specialities
- Internist
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Questions & Answers
Has Dr. Willis Chang affiliation with hospitals?
Dr. Willis Chang is affiliated with PALI MOMI MEDICAL CENTER.
Does Dr. Willis Chang have affiliation with practices?
Dr. Willis Chang is affiliated with West Oahu Primary Care.
Where can you meet with Dr. Willis Chang?
Dr. Willis Chang's office is located at 91-2139 Fort Weaver Road #213 in Ewa Beach, HI 96706.
Does Dr. Willis Chang accept insurance?
Dr. Willis Chang is listed in-network for 7 ACA Marketplace (Obamacare/HealthCare.gov) plans from HMSA. See the Marketplace plans section for details.
What conditions does Dr. Willis Chang treat?
Dr. Willis Chang provides treatment for Coronavirus, Cystitis, Encephalitis, Peptic Ulcer, Strep Throat, Typhoid Fever. For the full list see this list.