Dr. Koji Iizuka, MD
- Medicare services, 2024
- 105
- Medicare patients, 2024
- 28
- Part D claims, 2024
- 272
- Industry payments
- $23
- Medical group
- 1
- Practice address
- 459 Patterson Rd, Honolulu, HI 96819
- Practice phone
- Call (671) 646-8881
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Guam Seventh-day Adventist Clinic
Hospital · Honolulu, Hawaii
Find Dr. Iizuka's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Koji Iizuka is a psychiatrist in Honolulu, Hawaii
Dr. Iizuka practices at Guam Seventh-day Adventist Clinic in Honolulu, Hawaii.
Dr. Iizuka's NPI, 1811213523, was assigned on April 20, 2010. Dr. Iizuka graduated from Loma Linda University School of Medicine in 2010. Dr. Iizuka holds Hawaii license 16581.
- NPI
- 1811213523NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6103242706
- NPI enumeration date
- April 20, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (671) 646-8881
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 42
- Medical school graduation
- 2010
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Koji Iizuka practices at Guam Seventh-day Adventist Clinic in Honolulu, Hawaii
Dr. Iizuka's primary practice is Guam Seventh-day Adventist Clinic, at 459 Patterson Rd, Honolulu, HI 96819. The practice phone is (671) 646-8881.
- Guam Seventh-day Adventist Clinic459 Patterson Rd, Honolulu, HI 96819Phone(671) 646-8881
Source: Doctors and Clinicians National Downloadable File (CMS)
Dr. Koji Iizuka is affiliated with 1 site of care and 1 medical group
Dr. Iizuka's primary practice is Guam Seventh-day Adventist Clinic in Honolulu, Hawaii. The medical group on file is Guam Seventh-day Adventist Clinic.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Koji Iizuka's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Iizuka practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Guam Seventh-day Adventist Clinic | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Koji Iizuka is one of 236 psychiatrists in Hawaii
Psychiatry is Dr. Iizuka's primary specialty in the NPI Registry, under taxonomy code 2084P0800X. Dmand AI has Dr. Iizuka's licenses on file in 2 states: Hawaii and Guam.
Specialties and state licenses
- Psychiatry, HawaiiPrimary
- Guam license
Psychiatrists near Dr. Iizuka
Counts of psychiatrists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Koji Iizuka billed Medicare for 105 services in 2024
CMS data shows 105 Medicare services from Dr. Iizuka across 2 procedure codes in 2024, for 28 Medicare patients. Medicare paid $7,350 for them. Every service was in an office.
Dr. Iizuka's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1212024: 7240%
- Tests and treatments
- 2023: 1102024: 3370%
Dr. Iizuka compared with the Hawaii median for psychiatrists, 2024
- Dr. Iizuka
- Hawaii median
- Medicare services
- 105vs 11811% below
- Medicare patients
- 28vs 307% below
- Part D claims
- 124vs 16726% below
Medians across 223 psychiatrists in Hawaii with Dmand AI profiles that report each measure.
Dr. Iizuka's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Koji Iizuka treated 28 Medicare patients in 2024, average age 68
CMS counts 28 Medicare patients who saw Dr. Iizuka in 2024. 75% of them have high cholesterol, and 71% have anxiety. Their average risk score is 1.09, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Iizuka's median patient age at 38, with 69% women.
Dr. Iizuka's Medicare patients by sex, 2024
- Women1761%
- Men1139%
Chronic conditions among Dr. Iizuka's Medicare patients, 2024
- High cholesterol75%
- Anxiety71%
- Mood disorders68%
- Depression57%
- High blood pressure57%
- Arthritis39%
Share of Medicare patients with each condition. A patient can have several.
Dr. Iizuka's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 38
Patient panel by sex, all payers
- Women69%
- Men29%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Koji Iizuka wrote 272 Medicare Part D claims in 2024
In 2024, Dr. Iizuka wrote 272 Medicare Part D claims for 26 patients. 89% of them were for generic drugs. CMS names the drug for 124 of them, across 7 drugs with 11 or more claims each, at $26,433 in total drug cost. In 2023, CMS named 236 claims across 15 drugs.
Dr. Iizuka's Part D claims by kind of drug, 2024
- Generic242 claims89%
- Brand-name30 claims11%
Dr. Iizuka's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Iizuka's Part D claims, 2024
- Antipsychotics, patients 65 and over8%21 of 272 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2362024: 12447%
Drugs named by CMS: 7 in 2024, 15 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Koji Iizuka offers telehealth to Medicare patients
Dr. Iizuka accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Iizuka as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Koji Iizuka received $23 in industry payments in 2017
CMS Open Payments shows 1 general payment to Dr. Iizuka from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. Amgen Inc. paid the most, $23.
Companies that paid Dr. Iizuka the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Koji Iizuka graduated from Loma Linda University School of Medicine
Dr. Iizuka graduated from Loma Linda University School of Medicine in 2010.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Koji Iizuka's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Koji Iizuka
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Koji Iizuka's NPI number?
Dr. Koji Iizuka's NPI number is 1811213523. It was assigned on April 20, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Koji Iizuka?
Dr. Koji Iizuka is a psychiatrist in Honolulu, Hawaii. The primary specialty in the NPI Registry is Psychiatry Physician (taxonomy code 2084P0800X).
Where does Dr. Koji Iizuka practice?
Dr. Iizuka practices at 459 Patterson Rd, Honolulu, HI 96819. Dr. Iizuka's primary practice is Guam Seventh-day Adventist Clinic in Honolulu, Hawaii.
What is Dr. Koji Iizuka's office phone number?
The practice phone on file for Dr. Iizuka is (671) 646-8881.
What is Dr. Koji Iizuka's medical license number?
Dr. Iizuka holds Hawaii license 16581, one of the licenses on file in 2 states.
Which states has Dr. Koji Iizuka been licensed in?
Dmand AI has state licenses on file for Dr. Iizuka in Hawaii and Guam.
What medical group is Dr. Koji Iizuka part of?
Dr. Iizuka is linked to Guam Seventh-day Adventist Clinic.
Does Dr. Koji Iizuka accept Medicare?
Yes. CMS data shows Dr. Iizuka billed Medicare for 105 services in 2024, and Dr. Iizuka accepts Medicare assignment.
Does Dr. Koji Iizuka offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Iizuka as offering telehealth services.
How many Medicare patients does Dr. Koji Iizuka see?
CMS counts 28 Medicare patients who saw Dr. Iizuka in 2024, with an average age of 68.
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What services does Dr. Koji Iizuka bill to Medicare?
In 2024, Dr. Iizuka's most billed Medicare services were office visit, established patient (99214) and psychiatric service (90833).
Where did Dr. Koji Iizuka go to medical school?
Dr. Iizuka graduated from Loma Linda University School of Medicine in 2010.
What drugs does Dr. Koji Iizuka prescribe most?
In 2024 Medicare Part D data, Dr. Iizuka's most prescribed drugs by claims were Lamotrigine, Fluphenazine HCl and Quetiapine Fumarate.
Has Dr. Koji Iizuka received payments from drug or device companies?
CMS Open Payments shows $23 in general payments to Dr. Iizuka from 1 company from 2017 to 2017. The largest total came from Amgen Inc.
How long has Dr. Koji Iizuka been practicing?
Dr. Iizuka graduated from medical school in 2010, 16 years ago.
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