LYDIA K. REX MD
NPI 1275159071
Family Medicine in Needham, MA
About Lydia K. Rex Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LYDIA K. REX MD (NPI 1275159071) is an individual family medicine provider in Needham, Massachusetts, licensed in Massachusetts (1019363) and active in the NPI registry since June 2020. She is enrolled in Medicare PECOS and is a graduate of Tufts University School Of Medicine (2020).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 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 and accepts Medicare assignment
Lydia K. Rex 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 Reassignments
3Medicare enrollment records show Lydia Rex reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Wellesley, MA 02481
- Reassigned Medicare billing, Massachusetts enrollment
- 25 clinicians in this Medicare group
Andover, MA 01810
- Reassigned Medicare billing, Massachusetts enrollment
- 143 clinicians in this Medicare group
Lawrence, MA 01841
- Reassigned Medicare billing, Massachusetts enrollment
- 258 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 2
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02494 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 18
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Lydia Rex's NPI number?
The NPI number for Lydia Rex is 1275159071. It was assigned to this individual provider in the NPPES registry on June 18, 2020.
Where is Lydia Rex located?
Lydia Rex practices at 145 Rosemary Street Suite C, Needham, MA 02494. The listed phone number is (781) 235-7900.
What is Lydia Rex's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Lydia Rex enrolled in Medicare?
Yes. Lydia Rex 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 organizations bill Medicare for Lydia Rex's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Lydia Rex reassigns Medicare benefits to 3 organizations: Wellesley Family Care Associates, PC (Wellesley, MA), Greater Lawrence Family Health Center, Inc. (Andover, MA) and Lawrence General Hospital (Lawrence, MA). Each 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 Lydia Rex's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Lydia Rex accept?
Health plans from Taro Health list Lydia Rex 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 Lydia Rex was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Lydia K. Rex, MD · NPI 1275159071
Family Medicine physician in Needham, Massachusetts. Individual provider, active in the CMS NPPES registry since June 18, 2020.
## Identity
- **NPI:** 1275159071 (Entity type: Individual)
- **Enumerated:** June 18, 2020
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 1019363 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 145 ROSEMARY STREET, SUITE C, Needham, MA 02494-3259
- **Phone:** (781) 235-7900 · **Fax:** (781) 237-9930
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Wellesley Family Care Associates, PC (NPI 1902056310, Wellesley, MA); Greater Lawrence Family Health Center, Inc. (NPI 1255630448, Andover, MA); Lawrence General Hospital (NPI 1750381281, Lawrence, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Tufts University School Of Medicine, class of 2020
## Record status
- **NPPES last updated:** July 13, 2026
- **Other identifiers:** Medicaid 110163441A (MA)
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Source: [NPI Profile](https://npiprofile.com/npi/1275159071) · Data from the CMS NPPES public registry.