MARGARET ANN LEWIS
NPI 1740991389
Internal Medicine - Gastroenterology in Malvern, PA
About Margaret Ann Lewis NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET ANN LEWIS (NPI 1740991389) is an individual gastroenterology provider in Malvern, Pennsylvania, licensed in Pennsylvania (SP023866) and active in the NPI registry since December 2022. She is enrolled in Medicare PECOS, is affiliated with Paoli Hospital, and is a graduate of Jefferson Medical College Of Thomas Jefferson University (2020).
NPPES Registry Identity
Specialties & Licenses 2
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
Margaret Ann Lewis 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 Reassignment
Medicare enrollment records show Margaret Lewis reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Lancaster, PA 17601
- Reassigned Medicare billing, Pennsylvania enrollment
- 343 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.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Paoli Hospital
Acute Care Hospitals · Paoli, PARiddle Memorial Hospital
Acute Care Hospitals · Media, PAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 19355 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 6
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 Margaret Lewis's NPI number?
The NPI number for Margaret Lewis is 1740991389. It was assigned to this individual provider in the NPPES registry on December 5, 2022.
Where is Margaret Lewis located?
Margaret Lewis practices at 325 Central Ave Ste 200, Malvern, PA 19355. The listed phone number is (610) 644-6755.
What is Margaret Lewis's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Margaret Lewis enrolled in Medicare?
Yes. Margaret Lewis 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 organization bills Medicare for Margaret Lewis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Lewis reassigns Medicare benefits to Regional Gastroenterology Associates Of Lancaster, Ltd. (Lancaster, PA). The 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 Margaret Lewis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Margaret Lewis affiliated with any hospitals?
According to CMS data, Margaret Lewis is affiliated with Paoli Hospital and Riddle Memorial Hospital.
When was this NPI record last updated?
The NPPES record for Margaret Lewis was last updated on September 22, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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.
# Margaret Ann Lewis · NPI 1740991389
Gastroenterology physician in Malvern, Pennsylvania. Individual provider, active in the CMS NPPES registry since December 5, 2022.
## Identity
- **NPI:** 1740991389 (Entity type: Individual)
- **Enumerated:** December 5, 2022
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** SP023866 (Pennsylvania)
- **Sole proprietor:** No
## Practice location
- **Address:** 325 CENTRAL AVE STE 200, Malvern, PA 19355-3265
- **Phone:** (610) 644-6755
## 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:** Regional Gastroenterology Associates Of Lancaster, Ltd. (NPI 1154422806, Lancaster, PA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Jefferson Medical College Of Thomas Jefferson University, class of 2020
## Record status
- **NPPES last updated:** September 22, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1740991389) · Data from the CMS NPPES public registry.