DR. ONICA LEIGH WASHINGTON MD, PHD
NPI 1508362427
Internal Medicine - Nephrology in Worcester, MA
About Dr. Onica Leigh Washington Md, Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ONICA LEIGH WASHINGTON MD, PHD (NPI 1508362427) is an individual nephrology provider in Worcester, Massachusetts, licensed in Massachusetts (1014793) and active in the NPI registry since March 2018. She is enrolled in Medicare PECOS, is affiliated with Umass Memorial Healthalliance Hospitals, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
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
Dr. Onica Leigh Washington Md, Phd 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 Onica Washington reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Worcester, MA 01655
- Reassigned Medicare billing, Massachusetts enrollment
- 2,902 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 5
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 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Umass Memorial Healthalliance Hospitals
Acute Care Hospitals · Leominster, MAUmass Memorial Health - Harrington Hospital
Acute Care Hospitals · Southbridge, MAMilford Regional Medical Center
Acute Care Hospitals · Milford, MAUmass Memorial Medical Center/University Campus
Acute Care Hospitals · Worcester, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 01655 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.
WORCESTER, MA 01655
WORCESTER, MA 01655
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 Onica Washington's NPI number?
The NPI number for Onica Washington is 1508362427. It was assigned to this individual provider in the NPPES registry on March 30, 2018.
Where is Onica Washington located?
Onica Washington practices at 55 Lake Ave N, Worcester, MA 01655. The listed phone number is (508) 334-3155.
What is Onica Washington's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.
Is Onica Washington enrolled in Medicare?
Yes. Onica Washington 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 Onica Washington's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Onica Washington reassigns Medicare benefits to Umass Memorial Medical Group Inc (Worcester, 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 Onica Washington's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Onica Washington accept?
Health plans from Anthem Blue Cross and Blue Shield and Taro Health list Onica Washington 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 Onica Washington affiliated with any hospitals?
According to CMS data, Onica Washington is affiliated with Umass Memorial Healthalliance Hospitals, Umass Memorial Health - Harrington Hospital, Milford Regional Medical Center and Umass Memorial Medical Center/University Campus.
When was this NPI record last updated?
The NPPES record for Onica Washington was last updated on June 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Dr. Onica Leigh Washington, MD, PHD · NPI 1508362427
Nephrology physician in Worcester, Massachusetts. Individual provider, active in the CMS NPPES registry since March 30, 2018.
## Identity
- **NPI:** 1508362427 (Entity type: Individual)
- **Enumerated:** March 30, 2018
- **Primary specialty:** Internal Medicine - Nephrology · taxonomy 207RN0300X
- **State license:** 1014793 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 55 LAKE AVE N, Worcester, MA 01655-0002
- **Phone:** (508) 334-3155
## 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:** Umass Memorial Medical Group Inc (NPI 1760445373, Worcester, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Medical University Of South Carolina College Of Medicine, class of 2018
## Record status
- **NPPES last updated:** June 22, 2026
- **Other identifiers:** Medicaid 110138136A (MA)
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Source: [NPI Profile](https://npiprofile.com/npi/1508362427) · Data from the CMS NPPES public registry.