Isabel Casimiro, M.D., PH.D.
NPI 1942615596ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Honolulu, HI
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D., PH.D.) in Honolulu, Hawaii, trained at University of Washington School of Medicine (class of 2014). Their prescriptions cost Medicare Part D more than their services did: $1,628,590 for 2,428 claims, against $38,465 paid for services in 2024. Amgen Inc. was the largest of 7 companies reporting payments in 2025, $717.15 in all, mostly food and beverage.
Overview
| NPI | 1942615596 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D., PH.D. |
| Sole proprietor | Yes |
| NPI issued | Jun 23, 2014 |
| Last updated in NPPES | Jul 25, 2022 |
| Certified by provider | Jul 25, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | MD-22557 | HI |
| Internal Medicine | 207R00000X | 125064887 | IL |
| Internal Medicine, Endocrinology, Diabetes & Metabolism | 207RE0101X | 036.142507 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (HI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 168 |
|---|---|
| Services billed | 415 across 12 procedure codes |
| Paid by Medicare | $38,465 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,428 · 6,259 30-day fills |
|---|---|
| Patients | 238 |
| Total drug cost | $1,628,590 |
| Generic share | 46% of claims |
Education and affiliations
| Medical school | University of Washington School of Medicine |
|---|---|
| Graduation year | 2014 |
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Queens University Medical GroupHonolulu, HI · 614 clinicians
Hospital affiliations
- North Hawaii Community Hospital, IncKamuela, HI
- The Queens Medical CenterHonolulu, HI
Industry payments (Open Payments)
- 2025$717.15 · 11 payments from 7 companies
- 2024$439.55 · 6 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $244.11 | 3 |
| Esperion Therapeutics, Inc. | $175.72 | 2 |
| Tandem Diabetes Care, Inc. | $97.05 | 1 |
| Madrigal Pharmaceuticals | $79.47 | 1 |
| Mannkind Corporation | $68.81 | 1 |
What the 2025 payments were for
- Food and Beverage$717.15 · 11 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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