MS. KAREN ANNE SOMMER NP
NPI 1932143591
Nurse Practitioner - Adult Health in Boston, MA

Q: What is Karen Sommer's NPI number?

The NPI number for Karen Sommer is 1932143591. It was assigned to this individual provider in the NPPES registry on June 15, 2006.

Q: What is Karen Sommer's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Adult Health, with taxonomy code 363LA2200X.

Q: When was this NPI record last updated?

The NPPES record for Karen Sommer was last updated on May 29, 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.

Active since June 15, 2006PECOS Enrolled

450 BROOKLINE AVE # DANA1217, DANA-FARBER CANCER INSTITUTE, BOSTON, MA 02215(617) 632-5319 Get Directions Write a Review

NPPES record last updated: May 29, 2013. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Ms. Karen Anne Sommer Np NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MS. KAREN ANNE SOMMER NP (NPI 1932143591) is an individual adult health provider in Boston, Massachusetts, licensed in Massachusetts (176943) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1932143591

Entity TypeIndividualFemale

Primary Taxonomy363LA2200X

Provider Legal NameMS. KAREN ANNE SOMMERCredential: NP

Location Address450 BROOKLINE AVE # DANA1217, DANA-FARBER CANCER INSTITUTEBoston, MA 02215-5418

Mailing Address21 Walnut TerArlington, MA 02476-6118 · (781) 646-2362

Phone(617) 632-5319

Sole ProprietorYes

Enumeration DateJune 15, 2006

Last NPPES UpdateMay 29, 2013

✔ NPI 1932143591 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Adult HealthPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363LA2200X

License✔ Licensed in MA · 176943

450 BROOKLINE AVE # DANA1217, Boston, MA 02215

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ms. Karen Anne Sommer Np is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Karen Sommer reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Dana-Farber Cancer Institute, Inc.

Same address

General Acute Care Hospital

450 BROOKLINE AVE
Boston, MA 02215

Reassigned Medicare billing, Massachusetts enrollment
Also billed through NPI 1346433257 (Massachusetts)
1,026 clinicians in this Medicare group

NPI 1851333686 (617) 632-3000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02215 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$97.64 typical visit price

range $63.72 – $189.86

Typical copayment $24.41 (range $15.93 – $47.46)

Most-billed visit code 99203

Established Patient

$111.18 typical visit price

range $21.07 – $155.29

Typical copayment $27.79 (range $5.26 – $38.82)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Karen Sommer's NPI number?

The NPI number for Karen Sommer is 1932143591. It was assigned to this individual provider in the NPPES registry on June 15, 2006.

Where is Karen Sommer located?

Karen Sommer practices at 450 Brookline Ave # Dana1217 Dana-Farber Cancer Institute, Boston, MA 02215. The listed phone number is (617) 632-5319.

What is Karen Sommer's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Adult Health, with taxonomy code 363LA2200X.

Is Karen Sommer enrolled in Medicare?

Yes. Karen Sommer is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Karen Sommer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Karen Sommer reassigns Medicare benefits to Dana-Farber Cancer Institute, Inc. (Boston, 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 Karen Sommer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Karen Sommer was last updated on May 29, 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.