CHELSEA ERIN MARKS D.O.
NPI 1023371754
Obstetrics & Gynecology in Hanover, PA
About Chelsea Erin Marks D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CHELSEA ERIN MARKS D.O. (NPI 1023371754) is an individual obstetrics & gynecology provider in Hanover, Pennsylvania, licensed in Pennsylvania (OS018285) and active in the NPI registry since June 2012. She is enrolled in Medicare PECOS, is affiliated with Upmc Williamsport, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
Other Identifiers 1
Accepted Insurance
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
Chelsea Erin Marks D.o. 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
3Medicare enrollment records show Chelsea Marks reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Hanover, PA 17331
- Reassigned Medicare billing, Pennsylvania enrollment
- 1,902 clinicians in this Medicare group
Hanover, PA 17331
- Reassigned Medicare billing, Pennsylvania enrollment
- 3,080 clinicians in this Medicare group
Reading, PA 19602
- Reassigned Medicare billing, Pennsylvania enrollment
- 35 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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Upmc Williamsport
Acute Care Hospitals · Williamsport, PAUpmc Hanover
Acute Care Hospitals · Hanover, PAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 17331 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 16
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Chelsea Marks's NPI number?
The NPI number for Chelsea Marks is 1023371754. It was assigned to this individual provider in the NPPES registry on June 18, 2012.
Where is Chelsea Marks located?
Chelsea Marks practices at 20 North St, Hanover, PA 17331. The listed phone number is (717) 637-7755.
What is Chelsea Marks's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Chelsea Marks enrolled in Medicare?
Yes. Chelsea Marks 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 Chelsea Marks's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Chelsea Marks reassigns Medicare benefits to 3 organizations: Pinnacle Health Medical Services (Hanover, PA), Wellspan Medical Group (Hanover, PA) and Berks Community Health Center (Reading, 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 Chelsea Marks's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Chelsea Marks accept?
Health plans from Ambetter Health, Ambetter Health of Delaware and Ambetter from Buckeye Health Plan list Chelsea Marks as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Chelsea Marks affiliated with any hospitals?
According to CMS data, Chelsea Marks is affiliated with Upmc Williamsport and Upmc Hanover.
When was this NPI record last updated?
The NPPES record for Chelsea Marks was last updated on December 31, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months 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.
# Chelsea Erin Marks, D.O. · NPI 1023371754
Obstetrics & Gynecology physician in Hanover, Pennsylvania. Individual provider, active in the CMS NPPES registry since June 18, 2012.
## Identity
- **NPI:** 1023371754 (Entity type: Individual)
- **Enumerated:** June 18, 2012
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** OS018285 (Pennsylvania)
- **Sole proprietor:** No
## Practice location
- **Address:** 20 NORTH ST, Hanover, PA 17331-2275
- **Phone:** (717) 637-7755 · **Fax:** (717) 637-7142
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Pinnacle Health Medical Services (NPI 1194604538, Hanover, PA); Wellspan Medical Group (NPI 1114292760, Hanover, PA); Berks Community Health Center (NPI 1649525569, Reading, PA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Philadelphia College Of Osteopathic Medicine, class of 2012
## Record status
- **NPPES last updated:** December 31, 2025
- **Other identifiers:** Other PO1727515 (PA)
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Source: [NPI Profile](https://npiprofile.com/npi/1023371754) · Data from the CMS NPPES public registry.