Dr. Chad Koyanagi, MD

Hospital MedicineMaleAge 52

Dr. Koyanagi
928 Nuuanu Ave Ste 301 Honolulu, HI 96817

Make an Appointment

(808) 479-3200

Dr. Chad Koyanagi, MD is a Hospital Medicine Specialist in Honolulu, HI. He is affiliated with Adventist Health Castle. Be sure to call ahead with Dr. Koyanagi to book an appointment.

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At a Glance

  • Easy Scheduling
    Patients said scheduling was easy. See reviews
  • Practices at Top Hospital
    Outstanding Patient Experience Award™ See hospitals
  • Hospital Satisfaction
    Patients said they were highly satisfied at this doctor's hospital. See hospitals

Experience and Background Checks


Background Check

Healthgrades does not collect malpractice claims information for Hawaii
No disciplinary actions found for the years we collect data
No board actions found for the years we collect data
Learn more about background checks

Experience Check

Check if Dr. Koyanagi treats your condition or procedure

Dr. Koyanagi's conditions and procedures:

  • Abdominal Pain
  • Acidosis
  • Acute Kidney Failure
  • ADHD and-or ADD
  • Alcohol Withdrawal
  • All Headaches (incl. Migraine)
  • Anxiety
  • Asthma
  • Back Pain
  • Bedsores
  • Bell's Palsy
  • Bruise of Face, Scalp, or Neck
  • Cerebrovascular Disease
  • Chest Pain
  • Constipation
  • COPD (Chronic Obstructive Pulmonary Disease)
  • Dehydration
  • Diabetes Type 1
  • Diabetes Type 2
  • Diabetes With Renal Manifestations
  • Diabetic Ketoacidosis
  • Diarrhea
  • Dizziness
  • Drug Withdrawal
  • Dyslipidemia
  • Dysphagia
  • Epilepsy
  • Gastroesophageal Reflux Disease (GERD)
  • Headache
  • Heart Attack (Acute Myocardial Infarction)
  • Hiatal Hernia
  • Hyperlipidemia
  • Hypertension
  • Hypertensive Chronic Kidney Disease
  • Hypokalemia
  • Hyposmolality and Hyponatremia
  • Limb Pain
  • Limb Swelling Caused by Fluid Overload
  • Liver Function Test
  • Low Back Pain
  • Malaise and Fatigue
  • Migraine
  • Nausea
  • Pregnancy Test
  • Priapism
  • Seizure Disorders
  • Sepsis
  • Tobacco Use Disorder
  • Urinary Tract Infection (UTI)
  • Vitamin B Deficiency

Insurance Check

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Dr. Koyanagi accepts

Accepted insurance can change. Please double-check when making an appointment.

(808) 479-3200

Dr. Koyanagi accepts the following insurance:

Choice Plus POS II
National (BlueCard) PPO
Blue Cross Blue Shield
Blue Card PPO
CareFirst Blue Cross Blue Shield
HealthyBlue 2.0
HealthyBlue Advantage
Cigna PPO
Open Access Plus
Hawaii Medical Service Association (HMSA)
Federal Plan 87
Health Plan Hawaii HMO
HMSA Akamai Advantage (PPO and PPO SNP)
Preferred Provider Plan PPO
QUEST Integration

Dr. Koyanagi's Reviews

Likelihood to recommend Dr. Koyanagi


Based on 4 ratings

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Dr. Koyanagi
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My experience with Dr. KOYANAGI left me feeling hopeless & helpless. This doctor should not practice medicine. His explanation to me re my son's psychotic episode/illness was incomplete and entirely unacceptable. I would not recommend him ever. He was impatient, inconsiderate and frankly reprehensible.
What went well
No results
What could be improved
  • Long wait times
5 people found this helpful
Kailua, Hi – Sep 16, 2016
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About Me


Dr. Chad Koyanagi, MD is a Hospital Medicine Specialist in Honolulu, HI. He is affiliated with Adventist Health Castle. Be sure to call ahead with Dr. Koyanagi to book an appointment.


  • Hospital Medicine
  • Addiction Psychiatry

Board Certifications

  • Addiction Psychiatry
  • Psychiatry


Frequently Asked Questions

Does Dr. Chad Koyanagi, MD accept my insurance?

Use the Healthgrades insurance check to verify if Dr. Koyanagi accepts your insurance.

What are Dr. Chad Koyanagi, MD's top areas of care?

Dr. Koyanagi frequently treats Pregnancy Test, Abdominal Pain, and Acidosis. See all procedures and conditions Dr. Koyanagi treats.

Where is Dr. Chad Koyanagi, MD's office located?

Dr. Koyanagi's office is located at 928 Nuuanu Ave Ste 301, Honolulu, HI 96817. Find other locations and directions on Healthgrades.

Does Dr. Chad Koyanagi, MD offer telehealth services?

Dr. Koyanagi has not yet indicated whether they offer telehealth services. Please contact the office to check for availability/eligibility.

How can I make an appointment with Dr. Chad Koyanagi, MD?

Find contact information here to make an appointment.



928 Nuuanu Ave Ste 301 Honolulu, HI 96817

Affiliated Hospitals

Dr. Koyanagi is affiliated with the following hospital. Select the hospital below to learn more.

Learn more about how Healthgrades measuresHospital Quality.

Adventist Health Castle

Kailua, HI

83% Patient Experience Rating, 14% higher than the national average

7 Awards Received

Award Highlight: Outstanding Patient Experience Award™ (2021)