MARGARET M CHAPMAN M.D.
NPI 1164748471
Internal Medicine in Chicago, IL
About Margaret M Chapman M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET M CHAPMAN M.D. (NPI 1164748471) is an individual internal medicine provider in Chicago, Illinois, licensed in Illinois (036.135002) and active in the NPI registry since April 2010. She is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and is a graduate of University Of Washington School Of Medicine (2010).
NPPES Registry Identity
Specialties & Licenses
Other Names 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
Margaret M Chapman 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 Margaret Chapman reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,360 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,234 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 3
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Massachusetts General Hospital
Acute Care Hospitals · Boston, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60611 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.
CHICAGO, IL 60611
CHICAGO, IL 60611
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 Chapman's NPI number?
The NPI number for Margaret Chapman is 1164748471. It was assigned to this individual provider in the NPPES registry on April 12, 2010. The provider is also known as Margaret Marice Roller.
Where is Margaret Chapman located?
Margaret Chapman practices at 251 E Huron St Suite 16-738, Chicago, IL 60611. The listed phone number is (206) 914-5923.
What is Margaret Chapman's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Margaret Chapman enrolled in Medicare?
Yes. Margaret Chapman 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 Margaret Chapman's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Chapman reassigns Medicare benefits to 2 organizations: Massachusetts General Physicians Organization Inc (Boston, MA) and The General Hospital Corporation (Boston, MA). 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 Margaret Chapman's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Margaret Chapman accept?
Health plans from Taro Health list Margaret Chapman 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 Margaret Chapman affiliated with any hospitals?
According to CMS data, Margaret Chapman is affiliated with Massachusetts General Hospital.
When was this NPI record last updated?
The NPPES record for Margaret Chapman was last updated on May 6, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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 M Chapman, M.D. · NPI 1164748471
Internal Medicine physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since April 12, 2010.
## Identity
- **NPI:** 1164748471 (Entity type: Individual)
- **Enumerated:** April 12, 2010
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 036.135002 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 251 E HURON ST, SUITE 16-738, Chicago, IL 60611-2908
- **Phone:** (206) 914-5923
## 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): Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA); The General Hospital Corporation (NPI 1023049236, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Washington School Of Medicine, class of 2010
## Record status
- **NPPES last updated:** May 6, 2014
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Source: [NPI Profile](https://npiprofile.com/npi/1164748471) · Data from the CMS NPPES public registry.