DR. MARIELLE SOPHIA GROSS M.D.
NPI 1023420486
Obstetrics & Gynecology in Chambersburg, PA
About Dr. Marielle Sophia Gross M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARIELLE SOPHIA GROSS M.D. (NPI 1023420486) is an individual obstetrics & gynecology provider in Chambersburg, Pennsylvania, licensed in Pennsylvania (MD470686) and active in the NPI registry since May 2014. She is enrolled in Medicare PECOS, is affiliated with Wellspan Chambersburg Hospital, and maintains 3 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Marielle Sophia Gross M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Marielle Gross reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chambersburg, PA 17201
- Reassigned Medicare billing, Pennsylvania enrollment
- 3,080 clinicians in this Medicare group
Pittsburgh, PA 15235
- Reassigned Medicare billing, Pennsylvania enrollment
- 7,114 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Wellspan Chambersburg Hospital
Acute Care Hospitals · Chambersburg, PAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 17201 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 18
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CHAMBERSBURG, PA 17201
CHAMBERSBURG, PA 17201
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Marielle Gross's NPI number?
The NPI number for Marielle Gross is 1023420486. It was assigned to this individual provider in the NPPES registry on May 20, 2014.
Where is Marielle Gross located?
Marielle Gross practices at 12 St Paul Dr, Chambersburg, PA 17201. The listed phone number is (717) 217-6882.
What is Marielle Gross's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Marielle Gross enrolled in Medicare?
Yes. Marielle Gross is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Marielle Gross's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marielle Gross reassigns Medicare benefits to 2 organizations: Wellspan Medical Group (Chambersburg, PA) and University Of Pittsburgh Physicians (Pittsburgh, PA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marielle Gross's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Marielle Gross affiliated with any hospitals?
According to CMS data, Marielle Gross is affiliated with Wellspan Chambersburg Hospital.
When was this NPI record last updated?
The NPPES record for Marielle Gross was last updated on October 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Marielle Sophia Gross, M.D. · NPI 1023420486
Obstetrics & Gynecology physician in Chambersburg, Pennsylvania. Individual provider, active in the CMS NPPES registry since May 20, 2014.
## Identity
- **NPI:** 1023420486 (Entity type: Individual)
- **Enumerated:** May 20, 2014
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** MD470686 (Pennsylvania)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 12 ST PAUL DR, Chambersburg, PA 17201-1035
- **Phone:** (717) 217-6882 · **Fax:** (717) 255-0157
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Wellspan Medical Group (NPI 1033897228, Chambersburg, PA); University Of Pittsburgh Physicians (NPI 1407985674, Pittsburgh, PA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Florida College Of Medicine, class of 2014
## Record status
- **NPPES last updated:** October 21, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1023420486) · Data from the CMS NPPES public registry.