CAROLINE ELIZABETH O'BRIEN FNP-C
NPI 1124828801
Nurse Practitioner - Family in Medford, MA

Q: What is Caroline O'brien's NPI number?

The NPI number for Caroline O'brien is 1124828801. It was assigned to this individual provider in the NPPES registry on March 13, 2025.

Q: What is Caroline O'brien's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Q: When was this NPI record last updated?

The NPPES record for Caroline O'brien was last updated on March 12, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.

Active since March 13, 2025PECOS EnrolledAccepts Medicare Assignment

22 FRANKLIN ST, MEDFORD, MA 02155(781) 350-8571 Get Directions Write a Review

NPPES record last updated: March 12, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Mar 12, 2026, Mar 13, 2025 (2 updates tracked since 2025).

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About Caroline Elizabeth O'brien Fnp-c NPPES

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

CAROLINE ELIZABETH O'BRIEN FNP-C (NPI 1124828801) is an individual family provider in Medford, Massachusetts, licensed in Massachusetts (RN2333758) and active in the NPI registry since March 2025. She is enrolled in Medicare PECOS, is affiliated with Winchester Hospital, and maintains a secondary practice location in Woburn.

NPPES Registry Identity

NPI1124828801

Entity TypeIndividualFemale

Primary Taxonomy363LF0000X

Provider Legal NameCAROLINE ELIZABETH O'BRIENCredential: FNP-C

Location Address22 FRANKLIN STMedford, MA 02155-3918

Mailing Address22 Franklin StMedford, MA 02155-3918 · (781) 350-8571

Phone(781) 350-8571

Sole ProprietorNo

Medical School CMSOtherGraduated 2024

Enumeration DateMarch 13, 2025

Last NPPES UpdateMarch 12, 20262 updates tracked since enumeration

NPPES CertifiedMarch 12, 2026

✔ NPI 1124828801 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363LF0000X

License✔ Licensed in MA · RN2333758

Also ListedRegistered NurseTaxonomy 163W00000X · License RN2333758 (MA), 093013-21S (NH)

22 FRANKLIN ST, Medford, MA 02155

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Secondary Practice Location 1

Location 123 Warren Ave Ste 100Woburn, MA 01801-4979 · Phone (781) 933-1198

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Caroline Elizabeth O'brien Fnp-c 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 ID2062998594

PECOS Enrollment IDI20260114002137

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.

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Winchester Hospital

Acute Care Hospitals · Winchester, MA

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220105

Location41 Highland AvenueWinchester, MA 01890 · Middlesex County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02155 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 Caroline O'brien's NPI number?

The NPI number for Caroline O'brien is 1124828801. It was assigned to this individual provider in the NPPES registry on March 13, 2025.

Where is Caroline O'brien located?

Caroline O'brien practices at 22 Franklin St, Medford, MA 02155. The listed phone number is (781) 350-8571.

What is Caroline O'brien's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is Caroline O'brien enrolled in Medicare?

Yes. Caroline O'brien 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.

Is Caroline O'brien affiliated with any hospitals?

According to CMS data, Caroline O'brien is affiliated with Winchester Hospital.

When was this NPI record last updated?

The NPPES record for Caroline O'brien was last updated on March 12, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.