DR. MITCHELL S. REIN M.D.
NPI 1306810429
Obstetrics & Gynecology - Reproductive Endocrinology in Danvers, MA
About Dr. Mitchell S. Rein M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MITCHELL S. REIN M.D. (NPI 1306810429) is an individual reproductive endocrinology provider in Danvers, Massachusetts, licensed in Massachusetts (56895) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and is a graduate of Duke University School Of Medicine (1983).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 9
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. Mitchell S. Rein 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 Mitchell Rein 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.
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 01923 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 10
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 Mitchell Rein's NPI number?
The NPI number for Mitchell Rein is 1306810429. It was assigned to this individual provider in the NPPES registry on February 15, 2006.
Where is Mitchell Rein located?
Mitchell Rein practices at 1 Hutchinson Dr Nsmc-Women's Center, Danvers, MA 01923. The listed phone number is (978) 739-6920.
What is Mitchell Rein's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Reproductive Endocrinology, with taxonomy code 207VE0102X.
Is Mitchell Rein enrolled in Medicare?
Yes. Mitchell Rein 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 Mitchell Rein's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mitchell Rein 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 Mitchell Rein's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mitchell Rein affiliated with any hospitals?
According to CMS data, Mitchell Rein is affiliated with Massachusetts General Hospital.
When was this NPI record last updated?
The NPPES record for Mitchell Rein was last updated on July 17, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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. Mitchell S. Rein, M.D. · NPI 1306810429
Reproductive Endocrinology physician in Danvers, Massachusetts. Individual provider, active in the CMS NPPES registry since February 15, 2006.
## Identity
- **NPI:** 1306810429 (Entity type: Individual)
- **Enumerated:** February 15, 2006
- **Primary specialty:** Obstetrics & Gynecology - Reproductive Endocrinology · taxonomy 207VE0102X
- **State license:** 56895 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 HUTCHINSON DR, NSMC-WOMEN'S CENTER, Danvers, MA 01923-3759
- **Phone:** (978) 739-6920
## 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:** Duke University School Of Medicine, class of 1983
## Record status
- **NPPES last updated:** July 17, 2007
- **Other identifiers:** Medicaid 3020631 (MA); Other 0000178 (MA); Other 5237 (MA); and 6 more
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Source: [NPI Profile](https://npiprofile.com/npi/1306810429) · Data from the CMS NPPES public registry.