DR. MARY C STOCK M.D.
NPI 1871589127
Family Medicine in Newtown, PA
About Dr. Mary C Stock M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARY C STOCK M.D. (NPI 1871589127) is an individual family medicine provider in Newtown, Pennsylvania, licensed in Pennsylvania (MD434419) and active in the NPI registry since September 2005. She is enrolled in Medicare PECOS, is affiliated with Jefferson Health- Northeast, and maintains a secondary practice location in Allentown.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Location 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
Dr. Mary C Stock 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
5Medicare enrollment records show Mary Stock reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Holland, PA 18966
- Reassigned Medicare billing, Pennsylvania enrollment
- 490 clinicians in this Medicare group
Philadelphia, PA 19124
- Reassigned Medicare billing, Pennsylvania enrollment
- Medicare enrollment name: Methodist Associates In Healthcare, Inc
- 600 clinicians in this Medicare group
Quakertown, PA 18951
- Reassigned Medicare billing, Pennsylvania enrollment
- 2,895 clinicians in this Medicare group
Easton, PA 18042
- Reassigned Medicare billing, Pennsylvania enrollment
- 296 clinicians in this Medicare group
Pottsville, PA 17901
- Reassigned Medicare billing, Pennsylvania enrollment
- 399 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.
Jefferson Health- Northeast
Acute Care Hospitals · Philadelphia, PAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 18940 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 11
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
NEWTOWN, PA 18940
NEWTOWN, PA 18940
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 Mary Stock's NPI number?
The NPI number for Mary Stock is 1871589127. It was assigned to this individual provider in the NPPES registry on September 22, 2005. The provider is also known as Dr. Mary Catherine Stock-Keister M.D..
Where is Mary Stock located?
Mary Stock practices at 2700 S Eagle Rd, Newtown, PA 18940. The listed phone number is (215) 369-8614.
What is Mary Stock's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Mary Stock enrolled in Medicare?
Yes. Mary Stock 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 Mary Stock's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Stock reassigns Medicare benefits to 5 organizations: Aria Health Physician Services (Holland, PA), Methodist Associates In Health Care, Inc (Philadelphia, PA), Lehigh Valley Physician Group (Quakertown, PA), Valley Health Partners Community Health Center (Easton, PA) and Schuylkill Health System Medical Group, Inc. (Pottsville, 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 Mary Stock's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mary Stock accept?
Health plans from Ambetter Health, Ambetter Health of Delaware and Ambetter from Buckeye Health Plan list Mary Stock 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 Mary Stock affiliated with any hospitals?
According to CMS data, Mary Stock is affiliated with Jefferson Health- Northeast.
When was this NPI record last updated?
The NPPES record for Mary Stock was last updated on September 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 39 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. Mary C Stock, M.D. · NPI 1871589127
Family Medicine physician in Newtown, Pennsylvania. Individual provider, active in the CMS NPPES registry since September 22, 2005.
## Identity
- **NPI:** 1871589127 (Entity type: Individual)
- **Enumerated:** September 22, 2005
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** MD434419 (Pennsylvania)
- **Sole proprietor:** No
## Practice location
- **Address:** 2700 S EAGLE RD, Newtown, PA 18940-1570
- **Phone:** (215) 369-8614 · **Fax:** (215) 521-6415
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Aria Health Physician Services (NPI 1588925150, Holland, PA); Methodist Associates In Health Care, Inc (NPI 1609417872, Philadelphia, PA); Lehigh Valley Physician Group (NPI 1841782026, Quakertown, PA); Valley Health Partners Community Health Center (NPI 1992511083, Easton, PA); Schuylkill Health System Medical Group, Inc. (NPI 1063073823, Pottsville, PA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Pennsylvania State University College Of Medicine, class of 2001
## Record status
- **NPPES last updated:** September 24, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1871589127) · Data from the CMS NPPES public registry.