Tad Iwanuma, M.D.
NPI 1184600504 · Internal Medicine Physician · Honolulu, HI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tad Iwanuma, M.D. is a Internal Medicine Physician provider in Honolulu, HI (NPI 1184600504).
Provider details
- NPI number
- 1184600504
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 2484 (HI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
875 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 525 | $133 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 147 | $136 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 117 | $20 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 39 | $95 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 30 | $58 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 46 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 405 | 112 |
| Losartan Potassium | 231 | 66 |
| Losartan/Hydrochlorothiazidebrand: Losartan-Hydrochlorothiazide | 217 | 58 |
| Simvastatin | 214 | 60 |
| Amlodipine Besylate | 212 | 59 |
| Metformin Hcl | 119 | 35 |
| Felodipinebrand: Felodipine Er |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$15 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-12-17
- Last updated
- 2007-10-17
Frequently asked questions
- What is Tad Iwanuma's NPI number?
- Tad Iwanuma's National Provider Identifier (NPI) is 1184600504, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tad Iwanuma's specialty?
- Tad Iwanuma is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Tad Iwanuma located?
- Tad Iwanuma's practice location on file with NPPES is 321 N Kuakini St, Honolulu, HI 96817-2364.
- What is Tad Iwanuma's phone number?
- The practice phone number listed in the NPPES registry for Tad Iwanuma is (808) 524-4400.
- Does Tad Iwanuma accept Medicare?
- Tad Iwanuma is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tad Iwanuma's NPI active?
- Yes — Tad Iwanuma's NPI (1184600504) is active in the NPPES registry as of the last update on 2007-10-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.