Dr. Tad Y. Iwanuma, MD
- Medicare services, 2024
- 875
- Medicare patients, 2024
- 194
- Part D claims, 2024
- 3,174
- Industry payments
- $374
- State license
- 1
- Practice address
- 1301 Punchbowl St, Honolulu, HI 96813
- Practice phone
- Call (808) 522-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Straub Medical Center
Honolulu, Hawaii
Find Dr. Iwanuma'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. Tad Y. Iwanuma is an internist in Honolulu, Hawaii
Dr. Iwanuma practices at Straub Medical Center in Honolulu, Hawaii.
Dr. Iwanuma's NPI, 1184600504, was assigned on December 17, 2005. Dr. Iwanuma graduated from Tufts University School of Medicine in 1969. Dr. Iwanuma holds Hawaii license 2484.
- NPI
- 1184600504NPI Registry (opens in a new tab)
- NPI enumeration date
- December 17, 2005
- NPI status
- Active
- Practice phone
- (808) 522-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 83
- Medical school graduation
- 1969
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Tad Y. Iwanuma practices at Straub Medical Center in Honolulu, Hawaii
Dr. Iwanuma's primary practice is Straub Medical Center, at 1301 Punchbowl St, Honolulu, HI 96813 in Honolulu County. The practice phone is (808) 522-4000.
- Straub Medical Center1301 Punchbowl St, Honolulu, HI 96813 · Honolulu CountyPhone(808) 522-4000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Tad Y. Iwanuma is affiliated with 1 site of care
Dr. Iwanuma's primary practice is Straub Medical Center in Honolulu, Hawaii.
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Tad Y. Iwanuma's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Iwanuma practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Straub Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Tad Y. Iwanuma is one of 771 internists in Hawaii
Internal medicine is Dr. Iwanuma's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Iwanuma is licensed in Hawaii.
Specialties and state licenses
- Internal medicine, HawaiiPrimary
Internists near Dr. Iwanuma
Counts of internists 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. Tad Y. Iwanuma billed Medicare for 875 services in 2024
CMS data shows 875 Medicare services from Dr. Iwanuma across 6 procedure codes in 2024, for 194 Medicare patients. Medicare paid $71,756 for them. Every service was in an office.
Dr. Iwanuma's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6292024: 6113%
- Other services
- 2023: 2952024: 26411%
Dr. Iwanuma compared with the Hawaii median for internists, 2024
- Dr. Iwanuma
- Hawaii median
- Medicare services
- 875vs 3422.6 times
- Medicare patients
- 194vs 12852% above
- Part D claims
- 2,884vs 6704.3 times
Medians across 699 internists in Hawaii with Dmand AI profiles that report each measure.
Dr. Iwanuma'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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Iwanuma and other internists in Hawaii.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Tad Y. Iwanuma treated 194 Medicare patients in 2024, average age 77
CMS counts 194 Medicare patients who saw Dr. Iwanuma in 2024. The largest group is 75 to 84, with 101 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 0.89, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Iwanuma's median patient age at 78, with 35% women.
Dr. Iwanuma's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Iwanuma's Medicare patients by sex, 2024
- Women9750%
- Men9750%
Chronic conditions among Dr. Iwanuma's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Chronic kidney disease69%
- Diabetes34%
- Osteoporosis26%
- Cancer20%
- Ischemic heart disease20%
- Arthritis18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Iwanuma's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women35%
- Men65%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Tad Y. Iwanuma wrote 3,174 Medicare Part D claims in 2024
In 2024, Dr. Iwanuma wrote 3,174 Medicare Part D claims for 273 patients. 89% of them were for generic drugs. CMS names the drug for 2,884 of them, across 46 drugs with 11 or more claims each, at $408,809 in total drug cost. In 2023, CMS named 3,165 claims across 47 drugs.
Dr. Iwanuma's Part D claims by kind of drug, 2024
- Generic2,821 claims89%
- Brand-name329 claims10%
- Other24 claims1%
Dr. Iwanuma'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. Iwanuma's Part D claims, 2024
- Antibiotics1%24 of 3,174 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: 3,1652024: 2,8849%
Drugs named by CMS: 46 in 2024, 47 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
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Dr. Tad Y. Iwanuma received $374 in industry payments from 2016 to 2024
CMS Open Payments shows 21 general payments to Dr. Iwanuma from 7 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 97% of the total. Novo Nordisk Inc paid the most, $123.
General payments to Dr. Iwanuma by program year, 2016 to 2024
General payments to Dr. Iwanuma by kind, 2016 to 2024
- Food and beverage$36297%
- Education$123%
Companies that paid Dr. Iwanuma the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Tad Y. Iwanuma graduated from Tufts University School of Medicine
Dr. Iwanuma graduated from Tufts University School of Medicine in 1969.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Tad Y. Iwanuma'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice 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) |
| 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. Tad Y. Iwanuma
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. Tad Y. Iwanuma's NPI number?
Dr. Tad Y. Iwanuma's NPI number is 1184600504. It was assigned on December 17, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Tad Y. Iwanuma?
Dr. Tad Y. Iwanuma is an internist in Honolulu, Hawaii. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Tad Y. Iwanuma practice?
Dr. Iwanuma practices at 1301 Punchbowl St, Honolulu, HI 96813. Dr. Iwanuma's primary practice is Straub Medical Center in Honolulu, Hawaii.
What is Dr. Tad Y. Iwanuma's office phone number?
The practice phone on file for Dr. Iwanuma is (808) 522-4000.
What is Dr. Tad Y. Iwanuma's medical license number?
Dr. Iwanuma holds Hawaii license 2484.
Does Dr. Tad Y. Iwanuma accept Medicare?
Yes. CMS data shows Dr. Iwanuma billed Medicare for 875 services in 2024.
How many Medicare patients does Dr. Tad Y. Iwanuma see?
CMS counts 194 Medicare patients who saw Dr. Iwanuma in 2024, with an average age of 77.
What services does Dr. Tad Y. Iwanuma bill to Medicare?
In 2024, Dr. Iwanuma's most billed Medicare services were office visit, established patient (99214), medicare service (G0439) and medicare service (G0444).
Where did Dr. Tad Y. Iwanuma go to medical school?
Dr. Iwanuma graduated from Tufts University School of Medicine in 1969.
What drugs does Dr. Tad Y. Iwanuma prescribe most?
In 2024 Medicare Part D data, Dr. Iwanuma's most prescribed drugs by claims were Atorvastatin Calcium, Losartan Potassium and Losartan-Hydrochlorothiazide.
Has Dr. Tad Y. Iwanuma received payments from drug or device companies?
CMS Open Payments shows $374 in general payments to Dr. Iwanuma from 7 companies from 2016 to 2024. The largest total came from Novo Nordisk Inc.
How long has Dr. Tad Y. Iwanuma been practicing?
Dr. Iwanuma graduated from medical school in 1969, 57 years ago.
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