Ioannis Karakalpakis, MD
NPI 1033418264 · Hospitalist Physician · Wailuku, HI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ioannis Karakalpakis, MD is a Hospitalist Physician provider in Wailuku, HI (NPI 1033418264).
Provider details
- NPI number
- 1033418264
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD-19155 (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
15 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
554 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 210 | $78 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 154 | $118 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 98 | $114 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 33 | $49 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 21 | $164 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cephalexin | 24 | 24 |
| Metoprolol Succinate | 21 | 21 |
| Atorvastatin Calcium | 20 | 19 |
| Cefpodoxime Proxetil | 20 | 20 |
| Losartan Potassium | 17 | 16 |
| Amlodipine Besylate | 17 | 17 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$39 across 2 records (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
- 2011-03-28
- Last updated
- 2019-03-29
Frequently asked questions
- What is Ioannis Karakalpakis's NPI number?
- Ioannis Karakalpakis's National Provider Identifier (NPI) is 1033418264, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ioannis Karakalpakis's specialty?
- Ioannis Karakalpakis is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Ioannis Karakalpakis located?
- Ioannis Karakalpakis's practice location on file with NPPES is 221 Mahalani St, Wailuku, HI 96793.
- What is Ioannis Karakalpakis's phone number?
- The practice phone number listed in the NPPES registry for Ioannis Karakalpakis is (808) 442-5503.
- Does Ioannis Karakalpakis accept Medicare?
- Ioannis Karakalpakis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ioannis Karakalpakis's NPI active?
- Yes — Ioannis Karakalpakis's NPI (1033418264) is active in the NPPES registry as of the last update on 2019-03-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.