Quick answers
- Which hospitals does Doriann Klaassen work at?
- Medicare's official clinician data lists Doriann Klaassen at 2 hospitals: Cape Cod Hospital and Martha's Vineyard Hospital Inc. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Doriann Klaassen see patients?
- Medicare's clinician data lists 1 practice location in Hyannis, MA. Call before your visit to confirm the address.
- What is Doriann Klaassen's specialty?
- Medicare lists Endocrinology as the primary specialty.
- Does Doriann Klaassen accept Medicare assignment?
- Yes. Medicare's clinician data says Doriann Klaassen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Doriann Klaassen offer telehealth?
- Medicare's clinician data says Doriann Klaassen offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Doriann Klaassen?
- (508) 775-0202, as listed in official Medicare / NPI Registry data.
- What is Doriann Klaassen's NPI number?
- 1043721632. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Doriann Klaassen works
Medicare's Facility Affiliation Data lists Doriann Klaassen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Cape Cod HospitalHyannis, MA · Acute Care Hospital · CCN 220012
- Martha's Vineyard Hospital IncOak Bluffs, MA · Critical Access Hospital · CCN 221300
Practice locations
Addresses where Doriann Klaassen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1030 Falmouth Rd, Suite 201Hyannis, MA 02601 (508) 775‑0202
Group practices
Medicare enrollment lists Doriann Klaassen as a member of this group (CMS data updated 2026-10-02).
- Medical Affiliates of Cape Cod Inc229 clinicians in the group
Specialties
- Endocrinologyprimary
Other endocrinologists in Hyannis
Clinicians with the same Medicare primary specialty in Hyannis, MA — not a recommendation.
Clinician information
| Graduation year | 2018 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1043721632 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians