Mariko Katherine Johnson, M.D.
NPI 1629279617ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Honolulu, HI
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) in Honolulu, Hawaii, trained at Columbia University College of Physicians and Surgeons (class of 2005). Their prescriptions cost Medicare Part D more than their services did: $175,256 for 621 claims, against $25,938 paid for services in 2024. Alexion Pharmaceuticals, Inc. reported $16.88 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1629279617 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | May 29, 2007 |
| Last updated in NPPES | Aug 21, 2021 |
| Certified by provider | Aug 21, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | MD-16098 | HI |
| Internal Medicine | 207R00000X | 2005016358 | MO |
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 | 143 |
|---|---|
| Services billed | 587 across 9 procedure codes |
| Paid by Medicare | $25,938 |
Part D prescriptions in 2024
| Prescriptions (claims) | 621 · 1,748 30-day fills |
|---|---|
| Patients | 138 |
| Total drug cost | $175,256 |
| Generic share | 71% of claims |
Education and affiliations
| Medical school | Columbia University College of Physicians and Surgeons |
|---|---|
| Graduation year | 2005 |
| Medicare specialty | Endocrinology |
| 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$16.88 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alexion Pharmaceuticals, Inc. | $16.88 | 1 |
What the 2025 payments were for
- Food and Beverage$16.88 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Endocrinology, Diabetes & Metabolism providers in Honolulu
- 1316628738
- 1801292099
- 1104153121
- 1831163591
- 1487041307
- 1740508498
- 1780902577
- 1942615596
- 1306308796
- 1417308685
- 1497919914
- 1750377404
All Internal Medicine, Endocrinology, Diabetes & Metabolism providers in Hawaii →