MOLLY R SIEGEL MD
NPI 1588026157
Obstetrics & Gynecology in Boston, MA
About Molly R Siegel Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MOLLY R SIEGEL MD (NPI 1588026157) is an individual obstetrics & gynecology provider in Boston, Massachusetts, licensed in Massachusetts (MCS003783A) and active in the NPI registry since March 2016. She is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and is a graduate of Harvard Medical School (2016).
NPPES Registry Identity
Specialties & Licenses
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
Molly R Siegel Md 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 Molly Siegel reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts and New Hampshire enrollments
- 6,360 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,234 clinicians in this Medicare group
Northampton, MA 01060
- Reassigned Medicare billing, Massachusetts enrollment
- 539 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.
Massachusetts General Hospital
Acute Care Hospitals · Boston, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02114 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 4
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 Molly Siegel's NPI number?
The NPI number for Molly Siegel is 1588026157. It was assigned to this individual provider in the NPPES registry on March 23, 2016.
Where is Molly Siegel located?
Molly Siegel practices at 55 Fruit St # 4, Boston, MA 02114. The listed phone number is (617) 724-2229.
What is Molly Siegel's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Molly Siegel enrolled in Medicare?
Yes. Molly Siegel 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 Molly Siegel's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Molly Siegel reassigns Medicare benefits to 3 organizations: Massachusetts General Physicians Organization Inc (Boston, MA), The General Hospital Corporation (Boston, MA) and Mass General Brigham Medical Group Western Massachusetts Inc (Northampton, 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 Molly Siegel's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Molly Siegel affiliated with any hospitals?
According to CMS data, Molly Siegel is affiliated with Massachusetts General Hospital.
When was this NPI record last updated?
The NPPES record for Molly Siegel was last updated on February 29, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Molly R Siegel, MD · NPI 1588026157
Obstetrics & Gynecology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since March 23, 2016.
## Identity
- **NPI:** 1588026157 (Entity type: Individual)
- **Enumerated:** March 23, 2016
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** MCS003783A (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 55 FRUIT ST # 4, Boston, MA 02114-2621
- **Phone:** (617) 724-2229
## 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): Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA); The General Hospital Corporation (NPI 1023049236, Boston, MA); Mass General Brigham Medical Group Western Massachusetts Inc (NPI 1295787919, Northampton, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 2016
## Record status
- **NPPES last updated:** February 29, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1588026157) · Data from the CMS NPPES public registry.