DR. WILLIAM TIN-SHING CHOI MD, PHD
NPI 1861923658
Medical Genetics - Medical Biochemical Genetics in Boston, MA
About Dr. William Tin-shing Choi Md, Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM TIN-SHING CHOI MD, PHD (NPI 1861923658) is an individual medical biochemical genetics provider in Boston, Massachusetts, licensed in Massachusetts (286339) and active in the NPI registry since March 2017. He is enrolled in Medicare PECOS and maintains a secondary practice location in Boston.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. William Tin-shing Choi Md, Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show William Choi reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 1,358 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02115 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
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 William Choi's NPI number?
The NPI number for William Choi is 1861923658. It was assigned to this individual provider in the NPPES registry on March 23, 2017.
Where is William Choi located?
William Choi practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-6000.
What is William Choi's specialty?
The primary specialty registered for this NPI is Medical Genetics, specializing in Medical Biochemical Genetics, with taxonomy code 207SG0207X.
Is William Choi enrolled in Medicare?
Yes. William Choi is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for William Choi's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Choi reassigns Medicare benefits to Children's Hospital Pediatric Associates, Inc (Boston, 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 William Choi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Choi accept?
Health plans from Taro Health list William Choi 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.
When was this NPI record last updated?
The NPPES record for William Choi was last updated on August 29, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Dr. William Tin-Shing Choi, MD, PHD · NPI 1861923658
Medical Biochemical Genetics physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since March 23, 2017.
## Identity
- **NPI:** 1861923658 (Entity type: Individual)
- **Enumerated:** March 23, 2017
- **Primary specialty:** Medical Genetics - Medical Biochemical Genetics · taxonomy 207SG0207X
- **State license:** 286339 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 LONGWOOD AVE, Boston, MA 02115-5724
- **Phone:** (617) 355-6000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Children's Hospital Pediatric Associates, Inc (NPI 1457306664, Boston, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 29, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1861923658) · Data from the CMS NPPES public registry.