Margaret Siu
NPI 1427518455 · Surgery Physician · Springfield, MA
Enrolled with Medicare as Order and Referring Only - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Siu is a Surgery Physician provider in Springfield, MA (NPI 1427518455).
Provider details
- NPI number
- 1427518455
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- No
- License
- D0104111 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
7 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxycodone Hcl | 29 | 29 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-03-25
- Last updated
- 2026-06-02
- Certified
- 2026-06-02
Frequently asked questions
- What is Margaret Siu's NPI number?
- Margaret Siu's National Provider Identifier (NPI) is 1427518455, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Siu's specialty?
- Margaret Siu is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Siu located?
- Margaret Siu's practice location on file with NPPES is 759 Chestnut St, Springfield, MA 01199-0001.
- What is Margaret Siu's phone number?
- The practice phone number listed in the NPPES registry for Margaret Siu is (413) 794-0000.
- Does Margaret Siu accept Medicare?
- Margaret Siu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Siu's NPI active?
- Yes — Margaret Siu's NPI (1427518455) is active in the NPPES registry as of the last update on 2026-06-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.