DR. ELLEN M. STEIN M.D.
NPI 1053521450
Internal Medicine - Gastroenterology in Baltimore, MD
About Dr. Ellen M. Stein M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ELLEN M. STEIN M.D. (NPI 1053521450) is an individual gastroenterology provider in Baltimore, Maryland, licensed in Maryland (D70543) and active in the NPI registry since May 2007. She is enrolled in Medicare PECOS, is affiliated with Robert Wood Johnson University Hospital, and is a graduate of George Washington University School Of Medicine (2004).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 2
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. Ellen M. Stein 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
4Medicare enrollment records show Ellen Stein reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baltimore, MD 21205
- Reassigned Medicare billing, Maryland enrollment
- 4,483 clinicians in this Medicare group
Baltimore, MD 21287
- Reassigned Medicare billing, District of Columbia enrollment
- 34 clinicians in this Medicare group
Somerville, NJ 08876
- Reassigned Medicare billing, New Jersey enrollment
- 259 clinicians in this Medicare group
Somerville, NJ 08876
- Reassigned Medicare billing, New Jersey enrollment
- 641 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 13
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 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Robert Wood Johnson University Hospital
Acute Care Hospitals · New Brunswick, NJRobert Wood Johnson University Hospital - Somerset
Acute Care Hospitals · Somerville, NJJfk Medical Center
Acute Care Hospitals · Edison, NJCentrastate Medical Center
Acute Care Hospitals · Freehold, NJPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21287 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BALTIMORE, MD 21287
BALTIMORE, MD 21287
BALTIMORE, MD 21287
BALTIMORE, MD 21287
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 Ellen Stein's NPI number?
The NPI number for Ellen Stein is 1053521450. It was assigned to this individual provider in the NPPES registry on May 23, 2007.
Where is Ellen Stein located?
Ellen Stein practices at 600 N Wolfe St 1830 Bldg Room 429, Baltimore, MD 21287. The listed phone number is (410) 614-6708.
What is Ellen Stein's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Ellen Stein enrolled in Medicare?
Yes. Ellen Stein 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 Ellen Stein's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Stein reassigns Medicare benefits to 4 organizations: Johns Hopkins University (Baltimore, MD), Johns Hopkins University (Baltimore, MD), Rutgers Health-Rwj Neurosurgery Faculty (Somerville, NJ) and Rutgers Health-Rwj Scleroderma Program (Somerville, NJ). 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 Ellen Stein's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ellen Stein accept?
Health plans from Ambetter Health, Ambetter Health of Delaware and Oscar Health list Ellen Stein 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 Ellen Stein affiliated with any hospitals?
According to CMS data, Ellen Stein is affiliated with Robert Wood Johnson University Hospital, Robert Wood Johnson University Hospital - Somerset, Jfk Medical Center and Centrastate Medical Center.
When was this NPI record last updated?
The NPPES record for Ellen Stein was last updated on February 19, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Dr. Ellen M. Stein, M.D. · NPI 1053521450
Gastroenterology physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since May 23, 2007.
## Identity
- **NPI:** 1053521450 (Entity type: Individual)
- **Enumerated:** May 23, 2007
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** D70543 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 600 N WOLFE ST, 1830 BLDG ROOM 429, Baltimore, MD 21287-0005
- **Phone:** (410) 614-6708 · **Fax:** (410) 614-7631
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Johns Hopkins University (NPI 1033190442, Baltimore, MD); Johns Hopkins University (NPI 1487405205, Baltimore, MD); Rutgers Health-Rwj Neurosurgery Faculty (NPI 1548356926, Somerville, NJ); Rutgers Health-Rwj Scleroderma Program (NPI 1750453346, Somerville, NJ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** George Washington University School Of Medicine, class of 2004
## Record status
- **NPPES last updated:** February 19, 2013
- **Other identifiers:** Medicare PIN 186299ZAEM (MD); Medicaid 420201500 (MD)
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Source: [NPI Profile](https://npiprofile.com/npi/1053521450) · Data from the CMS NPPES public registry.