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CAROLINE GRACE MAHN
NPI 1932877065
Nurse Practitioner in Worcester, MA

Active since September 02, 2021PECOS EnrolledAccepts Medicare Assignment
5 NEPONSET ST, WORCESTER, MA 01606(508) 595-2300(508) 853-5226 Get Directions Write a Review

NPPES record last updated: June 3, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jun 3, 2025, Sep 9, 2024 (2 updates tracked since 2024).

About Caroline Grace Mahn NPPES

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

CAROLINE GRACE MAHN (NPI 1932877065) is an individual nurse practitioner in Worcester, Massachusetts, licensed in Massachusetts (RN2322044) and active in the NPI registry since September 2021. She is enrolled in Medicare PECOS, is affiliated with St Vincent Hospital, and is a graduate of Other (2021).

NPPES Registry Identity

NPI1932877065
Entity TypeIndividualFemale
Primary Taxonomy363L00000X
Provider Legal NameCAROLINE GRACE MAHN
Location Address5 NEPONSET STWorcester, MA 01606-2714
Mailing Address5 Neponset St Fl Center12Worcester, MA 01606-2714 · (508) 852-0600
Phone(508) 595-2300
Fax(508) 853-5226
Sole ProprietorNo
Medical School CMSOtherGraduated 2021
Enumeration DateSeptember 2, 2021
Last NPPES UpdateJune 3, 20252 updates tracked since enumeration
NPPES CertifiedJune 3, 2025
✔ NPI 1932877065 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363L00000X
License✔ Licensed in MA · RN2322044
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.
Also ListedNurse Practitioner · Adult HealthTaxonomy 363LA2200X · License RN2322044 (MA)
5 NEPONSET ST, Worcester, MA 01606
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.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

Caroline Grace Mahn 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 ID547668014
PECOS Enrollment IDI20211013003281
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 Reassignments

2

Medicare enrollment records show Caroline Mahn reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Reliant Medical Group, Inc
Same address
Family Medicine
5 NEPONSET ST
Worcester, MA 01606
  • Reassigned Medicare billing, Massachusetts enrollment
  • 718 clinicians in this Medicare group
NPI 1720017528 (508) 852-0600
Acton Medical Associates, PC
22 mi
Internal Medicine
321 MAIN ST
Acton, MA 01720
  • Reassigned Medicare billing, Massachusetts enrollment
  • 55 clinicians in this Medicare group
NPI 1447365408 (978) 635-8801

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.

St Vincent Hospital

Acute Care Hospitals · Worcester, MA
2/5 CMS rating
OwnershipProprietary
CMS Certification Number220176
Location123 Summer StreetWorcester, MA 01608 · Worcester County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01606 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
$90.70 typical visit price
range $58.86 – $177.36
Typical copayment $22.67 (range $14.71 – $44.34)
Most-billed visit code 99203
Established Patient
$103.48 typical visit price
range $19.11 – $144.84
Typical copayment $25.87 (range $4.77 – $36.21)
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.

DR. PRANATHI NARAYANAREDDY
Internal Medicine (Rheumatology)
5 NEPONSET ST
WORCESTER, MA 01606
Worcester County (508) 595-2855
ROBERT A YOOD MD
Internal Medicine (Rheumatology)
5 NEPONSET ST
WORCESTER, MA 01606
Worcester County (508) 595-2855
MATTHEW S HORSFIELD MD
Family Medicine
5 NEPONSET ST
WORCESTER, MA 01606
Worcester County (508) 425-5566
DANIELLE HARN NP
Nurse Practitioner (Family)
5 NEPONSET ST
WORCESTER, MA 01606
Worcester County (508) 425-5566
TERESA L STONE OD
Optometrist
5 NEPONSET ST
WORCESTER, MA 01606
Worcester County (508) 856-9599
MEAGHAN SAWTELLE
Physician Assistant
5 NEPONSET ST
WORCESTER, MA 01606
Worcester County (508) 368-7800
CHRISTINE CASTLE MSRD
Nutritionist
5 NEPONSET ST
WORCESTER, MA 01606
Worcester County (508) 852-6175
BRITTANY ALBERTA JASO PHD
Psychologist
5 NEPONSET ST
WORCESTER, MA 01606
Worcester County (508) 856-0732

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 Caroline Mahn's NPI number?

The NPI number for Caroline Mahn is 1932877065. It was assigned to this individual provider in the NPPES registry on September 2, 2021.

Where is Caroline Mahn located?

Caroline Mahn practices at 5 Neponset St, Worcester, MA 01606. The listed phone number is (508) 595-2300.

What is Caroline Mahn's specialty?

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

Is Caroline Mahn enrolled in Medicare?

Yes. Caroline Mahn 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 Caroline Mahn's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Caroline Mahn reassigns Medicare benefits to 2 organizations: Reliant Medical Group, Inc (Worcester, MA) and Acton Medical Associates, PC (Acton, 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 Caroline Mahn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Caroline Mahn accept?

Health plans from Anthem Blue Cross and Blue Shield list Caroline Mahn 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 Caroline Mahn affiliated with any hospitals?

According to CMS data, Caroline Mahn is affiliated with St Vincent Hospital.

When was this NPI record last updated?

The NPPES record for Caroline Mahn was last updated on June 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.