Dr. Chad Y. Koyanagi
- Gender: Male
- Experience: 26 years
- Graduated from: University Of Hawaii John A. Burns School Of Medicine
- Graduation year: 1995
- Sole propriator: No
- NPI: 1770536088
Dr. Chad Y. Koyanagi M.D.
Psychiatrist
He is located at 677 Ala Moana Blvd, Suite 1025 in Honolulu, HI 96813. Can help patients with the following: Anxiety, Insomnia, Mood Disorders, Rape and Sexual Assault, Schizoaffective Disorder, Sleepwalking. His National Provider Identifier (NPI) number is 1770536088. Appointment can be made via the phone number (808) 535-5975. He is affiliated with 1 practices and 1 hospitals.
Conditions treated
Dr. Chad Koyanagi, being an psychiatrist, 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. Chad Y. Koyanagi.
- Amnesia
- Anorexia Nervosa
- Antisocial Personality Disorder (ASPD)
- Anxiety
- Aphasia
- Asperger Syndrome (AS)
- Attention-Deficit/Hyperactivity Disorder (ADHD)
- Autism
- Avoidant Personality Disorder
- Binge Eating Disorder
- Bipolar Disorder
- Body Dysmorphic Disorder (BDD)
- Borderline Personality Disorder (BPD)
- Bulimia Nervosa
- Dementia
- Depression
- Dissociative Fugue
- Dissociative Identity Disorder
- Drug Abuse
- Eating Disorder
- Fragile X Syndrome (FXS)
- Grief
- Hypersomnia
- Insomnia
- Isolation
- Learning Disability
- Mental Illness
- Mood Disorders
- Munchausen Syndrome
- Narcissistic Personality Disorder (NPD)
- Obsessive Compulsive Disorder (OCD)
- Online Therapy
- Panic Disorder
- Persistent Depressive Disorder
- Pervasive Developmental Disorders (PDD)
- Phobias
- Postpartum Depression (PPD)
- Posttraumatic Stress Disorder (PTSD)
- Premenstrual Dysphoric Disorder (PMDD)
- Psychotic Disorder
- Rape and Sexual Assault
- Relationship Issues
- Schizoaffective Disorder
- Schizophrenia
- Seasonal Affective Disorder (SAD)
- Sleepwalking
- Speech Disorders
- Stress
- Tardive Dyskinesia
- Tics
- Trauma
- Wilson-Turner Syndrome
Procedures Performed by Dr. Chad Y. Koyanagi
ACA Marketplace (Obamacare/HealthCare.gov) plan networks
Insurers selling ACA Marketplace (HealthCare.gov) plans list Dr. Chad Y. Koyanagi 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. Chad Y. Koyanagi 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. Chad Y. Koyanagi is enrolled to bill Medicare as a Practitioner - Psychiatry .
Bills through: Castle Medical Center
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.
Payments received
Drug payment
| Janssen | $833 |
| Otsuka Pharmaceutical | $767 |
| Alkermes | $251 |
Other
| Food and Beverage | $2118 |
Studies
UNIVERSITY OF HAWAII JOHN A. BURNS SCHOOL OF MEDICINE
Graduated in 1995Additional Specialities
- Specialist
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Questions & Answers
What conditions does Dr. Chad Koyanagi treat?
Dr. Chad Koyanagi provides treatment for Anxiety, Insomnia, Mood Disorders, Rape and Sexual Assault, Schizoaffective Disorder, Sleepwalking. For the full list see this list.
Has Dr. Chad Koyanagi affiliation with hospitals?
Dr. Chad Koyanagi is affiliated with ADVENTIST HEALTH CASTLE.
Does Dr. Chad Koyanagi accept patients with HMSA?
Yes, Dr. Chad Koyanagi is listed in-network for HMSA through the ACA Marketplace (Obamacare/HealthCare.gov). See the Marketplace plans section for details.
Does Dr. Chad Koyanagi have affiliation with practices?
Dr. Chad Koyanagi is affiliated with University Health Partners of Hawaii.
Where can you meet with Dr. Chad Koyanagi?
Dr. Chad Koyanagi's office is located at 677 Ala Moana Blvd, Suite 1025 in Honolulu, HI 96813.