1. Home
  2. Directory
  3. Massachusetts
  4. Boston
  5. Nurse Practitioner
  6. NPI Profile

CATHERINE WELDER NP
NPI 1689446510
Nurse Practitioner in Boston, MA

Active since October 24, 2023PECOS EnrolledAccepts Medicare Assignment
100 CAMBRIDGE ST, BOSTON, MA 02114(617) 643-7289 Get Directions Write a Review

NPPES record last updated: December 27, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 27, 2025, Oct 24, 2023 (2 updates tracked since 2023).

About Catherine Welder Np NPPES

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

CATHERINE WELDER NP (NPI 1689446510) is an individual nurse practitioner in Boston, Massachusetts, licensed in Massachusetts (RN2285941) and active in the NPI registry since October 2023. She is enrolled in Medicare PECOS and is a graduate of Other (2024).

NPPES Registry Identity

NPI1689446510
Entity TypeIndividualFemale
Primary Taxonomy363L00000X
Provider Legal NameCATHERINE WELDERCredential: NP
Location Address100 CAMBRIDGE STBoston, MA 02114-2509
Mailing Address36 Grandview AveMedford, MA 02155-2933 · (361) 946-2007
Phone(617) 643-7289
Sole ProprietorNo
Medical School CMSOtherGraduated 2024
Enumeration DateOctober 24, 2023
Last NPPES UpdateDecember 27, 20252 updates tracked since enumeration
NPPES CertifiedDecember 27, 2025
✔ NPI 1689446510 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363L00000X
License✔ Licensed in MA · RN2285941
Definition
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
100 CAMBRIDGE ST, Boston, MA 02114
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Taro Health.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

Catherine Welder Np 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.

PECOS PAC ID3375019607
PECOS Enrollment IDI20260415001721
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 Catherine Welder reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Rosebud Indian Health Service
1,508 mi
General Acute Care Hospital
400 SOLDIER CREEK ROAD
Rosebud, SD 57570
  • Reassigned Medicare billing, Texas enrollment
  • 386 clinicians in this Medicare group
NPI 1194757369 (605) 747-3245

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 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.

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.

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.

MRS. OLUWATOYIN OLADOSU NP
Nurse Practitioner (Family)
100 CAMBRIDGE ST
BOSTON, MA 02114
Suffolk County (888) 731-8994
JUSTINE DURAND
Counselor (Mental Health)
100 CAMBRIDGE ST
BOSTON, MA 02114
Suffolk County (857) 299-1123
MILITZA CAJIGAS
Psychologist (Counseling)
100 CAMBRIDGE ST
BOSTON, MA 02114
Suffolk County (617) 899-2717
KATHERINE SUSAN KILLINGER FNP-C
Nurse Practitioner
100 CAMBRIDGE ST
BOSTON, MA 02114
Suffolk County (617) 726-7714
ISABELLE RAE GIRARD RN, PMHNP
Nurse Practitioner (Psychiatric/Mental Health)
100 CAMBRIDGE ST
BOSTON, MA 02114
Suffolk County (774) 331-8165
MARIAH ROBB
Counselor (Mental Health)
100 CAMBRIDGE ST
BOSTON, MA 02114
Suffolk County (857) 299-1123
SARAH C. TUFFO MS, FNP-C
Nurse Practitioner (Family)
100 CAMBRIDGE ST
BOSTON, MA 02114
Suffolk County (888) 731-8994
MS. LAUREN MORRISON CRNP ACNP
Nurse Practitioner (Acute Care)
100 CAMBRIDGE ST, 14TH FLOOR, SUITE 1400
BOSTON, MA 02114
Suffolk County (888) 731-8994

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 Catherine Welder's NPI number?

The NPI number for Catherine Welder is 1689446510. It was assigned to this individual provider in the NPPES registry on October 24, 2023.

Where is Catherine Welder located?

Catherine Welder practices at 100 Cambridge St, Boston, MA 02114. The listed phone number is (617) 643-7289.

What is Catherine Welder's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Is Catherine Welder enrolled in Medicare?

Yes. Catherine Welder 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 Catherine Welder's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Catherine Welder reassigns Medicare benefits to Rosebud Indian Health Service (Rosebud, SD). 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 Catherine Welder's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Catherine Welder accept?

Health plans from Taro Health list Catherine Welder 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.

When was this NPI record last updated?

The NPPES record for Catherine Welder was last updated on December 27, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months 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.