SISILIA THOMAS AGNP-C
NPI 1518842079
Nurse Practitioner - Gerontology in Boston, MA

Q: What is Sisilia Thomas's NPI number?

The NPI number for Sisilia Thomas is 1518842079. It was assigned to this individual provider in the NPPES registry on August 6, 2025. The provider is also known as Sisy John.

Q: What is Sisilia Thomas's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Gerontology, with taxonomy code 363LG0600X.

Q: When was this NPI record last updated?

The NPPES record for Sisilia Thomas was last updated on May 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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 August 06, 2025PECOS EnrolledAccepts Medicare Assignment

830 HARRISON AVENUE, 3RD FL, MOAKLEY BLDG, BOSTON, MA 02118(617) 638-6428(617) 638-5756 Get Directions Write a Review

NPPES record last updated: May 20, 2026. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: May 20, 2026, Aug 6, 2025 (2 updates tracked since 2025).

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About Sisilia Thomas Agnp-c NPPES

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

SISILIA THOMAS AGNP-C (NPI 1518842079) is an individual gerontology provider in Boston, Massachusetts, licensed in Massachusetts (RN2263665) and active in the NPI registry since August 2025. She is enrolled in Medicare PECOS, is affiliated with Boston Medical Center, and maintains a secondary practice location in Burlington.

NPPES Registry Identity

NPI1518842079

Entity TypeIndividualFemale

Primary Taxonomy363LG0600X

Provider Legal NameSISILIA THOMASCredential: AGNP-C

Location Address830 HARRISON AVENUE, 3RD FL, MOAKLEY BLDGBoston, MA 02118-2905

Mailing Address960 Massachusetts Ave, Fl 2Boston, MA 02118-2690

Phone(617) 638-6428

Fax(617) 638-5756

Sole ProprietorNo

Medical School CMSUniversity Of Massachusetts Medical SchoolGraduated 2025

Enumeration DateAugust 6, 2025

Last NPPES UpdateMay 20, 20262 updates tracked since enumeration

NPPES CertifiedMay 20, 2026

✔ NPI 1518842079 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

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

Taxonomy Code363LG0600X

License✔ Licensed in MA · RN2263665

830 HARRISON AVENUE, 3RD FL, Boston, MA 02118

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Other Names 1

Former Name (1)Sisy John

Secondary Practice Location 1

Location 16 Ledgewood DrBurlington, MA 01803-2008 · Phone (978) 495-2452

Other Identifiers 1

Medicaid110225757AMA

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

Sisilia Thomas Agnp-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 ID3678048543

PECOS Enrollment IDI20260408001730

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

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

Evans Medical Foundation, Inc.

0.1 mi

Internal Medicine

1 BOSTON MEDICAL CTR PL
Boston, MA 02118

Reassigned Medicare billing, Massachusetts enrollment
573 clinicians in this Medicare group

NPI 1912954124 (617) 358-3510

Dana-Farber Cancer Institute, Inc.

1.8 mi

General Acute Care Hospital

450 BROOKLINE AVE
Boston, MA 02215

Reassigned Medicare billing, Massachusetts enrollment
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.

Hospital Affiliations CMS Care Compare

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

Boston Medical Center

Acute Care Hospitals · Boston, MA

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220031

Location1 Boston Medical Center PlaceBoston, MA 02118 · Suffolk County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02118 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.

DR. GEOFFREY R. OXNARD MD

Internal Medicine (Medical Oncology)