Quick answers
- Does Marielle S. Gross accept Medicare assignment?
- Yes. Medicare's clinician data says Marielle S. Gross accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Marielle S. Gross's NPI number?
- 1023420486. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marielle S. Gross works
Medicare's Facility Affiliation Data lists Marielle S. Gross at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- WellSpan Chambersburg HospitalChambersburg, PA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 390151
Practice locations
Addresses where Marielle S. Gross is enrolled with Medicare (CMS data updated October 2, 2026).
- 12 St Paul DrChambersburg, PA 17201 (717) 217‑6026
- 120 N 7th St, Suite 200Chambersburg, PA 17201 (717) 217‑6882
Group practices
Medicare enrollment lists Marielle S. Gross as a member of this group (CMS data updated October 2, 2026).
- WellSpan Medical Group2,480 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Chambersburg
Clinicians with the same Medicare primary specialty in Chambersburg, PA — not a recommendation.
Other clinicians in WellSpan Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Florida College Of Medicine |
| Graduation year | 2014 (12 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1023420486 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- 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