Quick answers
- Which hospitals does Marissa Baltus work at?
- Medicare's official clinician data lists Marissa Baltus at 4 hospitals: Beth Israel Deaconess Medical Center, Lahey Hospital & Medical Center, Burlington, Northeast Hospital Corporation and Winchester Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marissa Baltus see patients?
- Medicare's clinician data lists 2 practice locations, including Burlington, MA. Call before your visit to confirm the address.
- What is Marissa Baltus's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Marissa Baltus accept Medicare assignment?
- Yes. Medicare's clinician data says Marissa Baltus 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 Marissa Baltus offer telehealth?
- Medicare's clinician data says Marissa Baltus offers telehealth services. Ask the office which visits can be done by video or phone.
- What is Marissa Baltus's NPI number?
- 1942308796. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marissa Baltus works
Medicare's Facility Affiliation Data lists Marissa Baltus at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Beth Israel Deaconess Medical CenterBoston, MA · Acute Care Hospital · CCN 220086
- Lahey Hospital & Medical Center, BurlingtonBurlington, MA · Acute Care Hospital · CCN 220171
- Northeast Hospital CorporationBeverly, MA · Acute Care Hospital · CCN 220033
- Winchester HospitalWinchester, MA · Acute Care Hospital · CCN 220105
Practice locations
Addresses where Marissa Baltus is enrolled with Medicare (CMS data updated 2026-10-02).
- 29 Mall RdBurlington, MA 01805
- 41 Mall RdBurlington, MA 01805
Group practices
Medicare enrollment lists Marissa Baltus as a member of this group (CMS data updated 2026-10-02).
- Lahey Clinic Inc1,381 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Burlington
Clinicians with the same Medicare primary specialty in Burlington, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tufts University School Of Medicine |
| Graduation year | 1988 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1942308796 |
| 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