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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

SIOBHAN BAXTER
NPI 1679325310
Physician Assistant in Boston, MA

Active since April 04, 2024PECOS EnrolledAccepts Medicare Assignment
200 HIGH ST FL 5, BOSTON, MA 02110(617) 221-6909 Get Directions Write a Review

NPPES record last updated: August 10, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Aug 10, 2026, Apr 4, 2024 (2 updates tracked since 2024).

About Siobhan Baxter NPPES

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

SIOBHAN BAXTER (NPI 1679325310) is an individual physician assistant in Boston, Massachusetts, licensed in Massachusetts (PA100782) and active in the NPI registry since April 2024. She is enrolled in Medicare PECOS, is affiliated with Melrosewakefield Healthcare, and is a graduate of Other (2024).

NPPES Registry Identity

NPI1679325310
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameSIOBHAN BAXTER
Location Address200 HIGH ST FL 5Boston, MA 02110-3036
Mailing Address2 Mallard LnNorth Reading, MA 01864-2169 · (781) 315-3008
Phone(617) 221-6909
Sole ProprietorNo
Medical School CMSOtherGraduated 2024
Enumeration DateApril 4, 2024
Last NPPES UpdateAugust 10, 20262 updates tracked since enumeration
NPPES CertifiedAugust 10, 2026
✔ NPI 1679325310 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
License✔ Licensed in MA · PA100782
Definition
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
200 HIGH ST FL 5, Boston, MA 02110
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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

Siobhan Baxter 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 ID3072057645
PECOS Enrollment IDI20240708001063
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 2

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

Melrosewakefield Healthcare

Acute Care Hospitals · Melrose, MA
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220070
Location585 Lebanon StreetMelrose, MA 02176 · Middlesex County
Emergency services Birthing friendly

Tufts Medical Center

Acute Care Hospitals · Boston, MA
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220116
Location800 Washington StreetBoston, MA 02111 · Suffolk County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02110 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
$78.84 typical visit price
range $21.07 – $155.29
Typical copayment $19.71 (range $5.26 – $38.82)
Most-billed visit code 99213
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

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. THERESA A. HADLOCK M.D.
Otolaryngology (Facial Plastic Surgery)
200 HIGH ST FL 5
BOSTON, MA 02110
Suffolk County (617) 221-6909

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 Siobhan Baxter's NPI number?

The NPI number for Siobhan Baxter is 1679325310. It was assigned to this individual provider in the NPPES registry on April 4, 2024.

Where is Siobhan Baxter located?

Siobhan Baxter practices at 200 High St Fl 5, Boston, MA 02110. The listed phone number is (617) 221-6909.

What is Siobhan Baxter's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Is Siobhan Baxter enrolled in Medicare?

Yes. Siobhan Baxter 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 Siobhan Baxter affiliated with any hospitals?

According to CMS data, Siobhan Baxter is affiliated with Melrosewakefield Healthcare and Tufts Medical Center.

When was this NPI record last updated?

The NPPES record for Siobhan Baxter was last updated on August 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 days 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.