DR. MARGARET M XU MD
NPI 1003435280
Internal Medicine - Geriatric Medicine in New Haven, CT
About Dr. Margaret M Xu Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARGARET M XU MD (NPI 1003435280) is an individual geriatric medicine provider in New Haven, Connecticut, licensed in Connecticut (66101) and active in the NPI registry since April 2020. She is enrolled in Medicare PECOS and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses
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
Dr. Margaret M Xu 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 Margaret Xu reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
New Haven, CT 06510
- Reassigned Medicare billing, Connecticut enrollment
- Medicare enrollment name: Northeast Medical Group Inc
- 1,824 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 06510 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.
NEW HAVEN, CT 06510
NEW HAVEN, CT 06510
NEW HAVEN, CT 06510
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 Margaret Xu's NPI number?
The NPI number for Margaret Xu is 1003435280. It was assigned to this individual provider in the NPPES registry on April 8, 2020.
Where is Margaret Xu located?
Margaret Xu practices at 20 York St, New Haven, CT 06510. The listed phone number is (203) 688-4242.
What is Margaret Xu's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Geriatric Medicine, with taxonomy code 207RG0300X.
Is Margaret Xu enrolled in Medicare?
Yes. Margaret Xu 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 Margaret Xu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Xu reassigns Medicare benefits to Mill Hill Medical Consultants Inc (New Haven, CT). 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 Margaret Xu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Margaret Xu accept?
Health plans from Anthem Blue Cross and Blue Shield list Margaret Xu 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 Margaret Xu was last updated on February 2, 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. Margaret M Xu, MD · NPI 1003435280
Geriatric Medicine physician in New Haven, Connecticut. Individual provider, active in the CMS NPPES registry since April 8, 2020.
## Identity
- **NPI:** 1003435280 (Entity type: Individual)
- **Enumerated:** April 8, 2020
- **Primary specialty:** Internal Medicine - Geriatric Medicine · taxonomy 207RG0300X
- **State license:** 66101 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 20 YORK ST, New Haven, CT 06510-3220
- **Phone:** (203) 688-4242
## 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:** Mill Hill Medical Consultants Inc (NPI 1952624769, New Haven, CT), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** February 2, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1003435280) · Data from the CMS NPPES public registry.