MATTHEW Y SIU MD
NPI 1467441816
Family Medicine in Malden, MA
About Matthew Y Siu Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MATTHEW Y SIU MD (NPI 1467441816) is an individual family medicine provider in Malden, Massachusetts, licensed in Massachusetts (78886) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS, is affiliated with Melrosewakefield Healthcare, and is a graduate of Other (1972).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Accepted 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
Matthew Y Siu Md 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.
Medicare Billing Reassignment
Medicare enrollment records show Matthew Siu reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Medford, MA 02155
- Reassigned Medicare billing, Massachusetts enrollment
- 246 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 9
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
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, MATufts Medical Center
Acute Care Hospitals · Boston, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02148 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 4
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 16
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MALDEN, MA 02148
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 Matthew Siu's NPI number?
The NPI number for Matthew Siu is 1467441816. It was assigned to this individual provider in the NPPES registry on October 18, 2005.
Where is Matthew Siu located?
Matthew Siu practices at 578 Main St Hallmark Health Medical Associates, Malden, MA 02148. The listed phone number is (781) 321-3422.
What is Matthew Siu's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Matthew Siu enrolled in Medicare?
Yes. Matthew Siu 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 organization bills Medicare for Matthew Siu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Matthew Siu reassigns Medicare benefits to Hallmark Health Medical Associates Inc (Medford, MA). The 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 Matthew Siu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Matthew Siu accept?
Health plans from Anthem Blue Cross and Blue Shield and Taro Health list Matthew Siu 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 Matthew Siu affiliated with any hospitals?
According to CMS data, Matthew Siu is affiliated with Melrosewakefield Healthcare and Tufts Medical Center.
When was this NPI record last updated?
The NPPES record for Matthew Siu was last updated on February 24, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years 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.
# Matthew Y Siu, MD · NPI 1467441816
Family Medicine physician in Malden, Massachusetts. Individual provider, active in the CMS NPPES registry since October 18, 2005.
## Identity
- **NPI:** 1467441816 (Entity type: Individual)
- **Enumerated:** October 18, 2005
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 78886 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 578 MAIN ST, HALLMARK HEALTH MEDICAL ASSOCIATES, Malden, MA 02148-3900
- **Phone:** (781) 321-3422 · **Fax:** (781) 321-1863
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Hallmark Health Medical Associates Inc (NPI 1770563900, Medford, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1972
## Record status
- **NPPES last updated:** February 24, 2015
- **Other identifiers:** Medicare UPIN F85410; Medicaid 3129080 (MA)
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Source: [NPI Profile](https://npiprofile.com/npi/1467441816) · Data from the CMS NPPES public registry.