Doriann Klaassen, MD
NPI 1043721632ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Hyannis, MA
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) with Medical Affiliates of Cape Cod Inc, practicing in Hyannis, Massachusetts. Their prescriptions cost Medicare Part D more than their services did: $287,065 for 568 claims, against $14,908 paid for services in 2024. Amgen Inc. was the largest of 17 companies reporting payments in 2025, $902.47 in all, mostly food and beverage. Lists Cape Cod Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1043721632 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 23, 2017 |
| Last updated in NPPES | Feb 5, 2025 |
| Certified by provider | Feb 5, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 1020815 | MA |
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 (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 91 |
|---|---|
| Services billed | 271 across 11 procedure codes |
| Paid by Medicare | $14,908 |
Part D prescriptions in 2024
| Prescriptions (claims) | 568 · 979 30-day fills |
|---|---|
| Patients | 111 |
| Total drug cost | $287,065 |
| Generic share | 27% of claims |
Education and affiliations
| Graduation year | 2018 |
|---|---|
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- Medical Affiliates of Cape Cod IncHyannis, MA · 229 clinicians
Hospital affiliations
- Cape Cod HospitalHyannis, MA
- Martha's Vineyard Hospital IncOak Bluffs, MA
Industry payments (Open Payments)
- 2025$902.47 · 38 payments from 17 companies
- 2024$372.36 · 11 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $212.79 | 12 |
| Ucb, Inc. | $122.37 | 5 |
| Abbott Laboratories | $109.98 | 1 |
| Fresenius Kabi USA, LLC | $51.18 | 2 |
| Xeris Pharmaceuticals, Inc. | $47.73 | 2 |
What the 2025 payments were for
- Food and Beverage$792.49 · 37 payments
- Long term medical supply or device loan$109.98 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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