DR. STEPHANIE LOUISE KOONTZ MD
NPI 1225108160
Obstetrics & Gynecology in Somerville, MA
About Dr. Stephanie Louise Koontz Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. STEPHANIE LOUISE KOONTZ MD (NPI 1225108160) is an individual obstetrics & gynecology provider in Somerville, Massachusetts, licensed in Massachusetts (220863) and active in the NPI registry since November 2006. She is enrolled in Medicare PECOS, is affiliated with Mount Auburn Hospital, and is a graduate of Other (2000).
NPPES Registry Identity
Specialties & Licenses
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. Stephanie Louise Koontz 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 Reassignment
Medicare enrollment records show Stephanie Koontz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Cambridge, MA 02138
- Reassigned Medicare billing, Massachusetts enrollment
- 423 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.
Mount Auburn Hospital
Acute Care Hospitals · Cambridge, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02144 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.
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 Stephanie Koontz's NPI number?
The NPI number for Stephanie Koontz is 1225108160. It was assigned to this individual provider in the NPPES registry on November 8, 2006.
Where is Stephanie Koontz located?
Stephanie Koontz practices at 40 Holland St, Somerville, MA 02144. The listed phone number is (617) 629-6330.
What is Stephanie Koontz's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Stephanie Koontz enrolled in Medicare?
Yes. Stephanie Koontz 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 Stephanie Koontz's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stephanie Koontz reassigns Medicare benefits to Mount Auburn Professional Services Inc (Cambridge, MA). 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 Stephanie Koontz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Stephanie Koontz accept?
Health plans from Anthem Blue Cross and Blue Shield list Stephanie Koontz 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 Stephanie Koontz affiliated with any hospitals?
According to CMS data, Stephanie Koontz is affiliated with Mount Auburn Hospital.
When was this NPI record last updated?
The NPPES record for Stephanie Koontz was last updated on July 18, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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. Stephanie Louise Koontz, MD · NPI 1225108160
Obstetrics & Gynecology physician in Somerville, Massachusetts. Individual provider, active in the CMS NPPES registry since November 8, 2006.
## Identity
- **NPI:** 1225108160 (Entity type: Individual)
- **Enumerated:** November 8, 2006
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** 220863 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 40 HOLLAND ST, Somerville, MA 02144-2705
- **Phone:** (617) 629-6330 · **Fax:** (617) 629-6128
## 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:** Mount Auburn Professional Services Inc (NPI 1992750996, Cambridge, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2000
## Record status
- **NPPES last updated:** July 18, 2011
- **Other identifiers:** Medicaid 2086115 (MA); Medicare PIN A37584 (MA)
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Source: [NPI Profile](https://npiprofile.com/npi/1225108160) · Data from the CMS NPPES public registry.