Quick answers
- Which hospitals does Marian Isaak work at?
- Medicare's official clinician data lists Marian Isaak at 2 hospitals: Baystate Medical Center and Holyoke Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marian Isaak see patients?
- Medicare's clinician data lists 1 practice location in Holyoke, MA. Call before your visit to confirm the address.
- What is Marian Isaak's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Marian Isaak accept Medicare assignment?
- Yes. Medicare's clinician data says Marian Isaak 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.
- What is the phone number for Marian Isaak?
- (413) 536-8924, as listed in official Medicare / NPI Registry data.
- What is Marian Isaak's NPI number?
- 1083340004. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marian Isaak works
Medicare's Facility Affiliation Data lists Marian Isaak at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Baystate Medical CenterSpringfield, MA · Acute Care Hospital · CCN 220077
- Holyoke Medical CenterHolyoke, MA · Acute Care Hospital · CCN 220024
Practice locations
Addresses where Marian Isaak is enrolled with Medicare (CMS data updated 2026-10-02).
- 2 Hospital Dr, Suite 101Holyoke, MA 01040 (413) 536‑8924
Group practices
Medicare enrollment lists Marian Isaak as a member of this group (CMS data updated 2026-10-02).
- Western Mass Physician Associates Inc71 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Holyoke
Clinicians with the same Medicare primary specialty in Holyoke, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1083340004 |
| 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