DR. CORDELIA ARIEL NASON M.D.
NPI 1477679645
Anesthesiology in Winchester, MA
About Dr. Cordelia Ariel Nason M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CORDELIA ARIEL NASON M.D. (NPI 1477679645) is an individual anesthesiology provider in Winchester, Massachusetts, licensed in Massachusetts (234488) and active in the NPI registry since March 2007. She is enrolled in Medicare PECOS, is affiliated with Umass Memorial Healthcare-marlborough Hospital, and is a graduate of Boston University School Of Medicine (2006).
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. Cordelia Ariel Nason M.d. 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
4Medicare enrollment records show Cordelia Nason reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Concord, MA 01742
- Reassigned Medicare billing, Massachusetts enrollment
- 21 clinicians in this Medicare group
Concord, MA 01742
- Reassigned Medicare billing, Massachusetts enrollment
- 72 clinicians in this Medicare group
Nashua, NH 03062
- Reassigned Medicare billing, New Hampshire enrollment
- 23 clinicians in this Medicare group
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 3
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.
Umass Memorial Healthcare-Marlborough Hospital
Acute Care Hospitals · Marlborough, MAUmass Memorial Medical Center/University Campus
Acute Care Hospitals · Worcester, MAOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WINCHESTER, MA 01890
WINCHESTER, MA 01890
WINCHESTER, MA 01890
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 Cordelia Nason's NPI number?
The NPI number for Cordelia Nason is 1477679645. It was assigned to this individual provider in the NPPES registry on March 21, 2007.
Where is Cordelia Nason located?
Cordelia Nason practices at 41 Highland Ave, Winchester, MA 01890. The listed phone number is (781) 756-7243.
What is Cordelia Nason's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Cordelia Nason enrolled in Medicare?
Yes. Cordelia Nason 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 Cordelia Nason's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Cordelia Nason reassigns Medicare benefits to 4 organizations: Emerson Endoscopy And Digestive Health Center, LLC (Concord, MA), Emerson Practice Associates II, Inc. (Concord, MA), Skyline Anesthesia PLLC (Nashua, NH) and Umass Memorial Medical Group Inc (Worcester, 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 Cordelia Nason's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Cordelia Nason accept?
Health plans from Taro Health list Cordelia Nason 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 Cordelia Nason affiliated with any hospitals?
According to CMS data, Cordelia Nason is affiliated with Umass Memorial Healthcare-Marlborough Hospital and Umass Memorial Medical Center/University Campus.
When was this NPI record last updated?
The NPPES record for Cordelia Nason was last updated on April 2, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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. Cordelia Ariel Nason, M.D. · NPI 1477679645
Anesthesiology physician in Winchester, Massachusetts. Individual provider, active in the CMS NPPES registry since March 21, 2007.
## Identity
- **NPI:** 1477679645 (Entity type: Individual)
- **Enumerated:** March 21, 2007
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 234488 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 41 HIGHLAND AVE, Winchester, MA 01890-1446
- **Phone:** (781) 756-7243
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Emerson Endoscopy And Digestive Health Center, LLC (NPI 1326717281, Concord, MA); Emerson Practice Associates II, Inc. (NPI 1427383645, Concord, MA); Skyline Anesthesia PLLC (NPI 1386351674, Nashua, NH); Umass Memorial Medical Group Inc (NPI 1760445373, Worcester, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Boston University School Of Medicine, class of 2006
## Record status
- **NPPES last updated:** April 2, 2012
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Source: [NPI Profile](https://npiprofile.com/npi/1477679645) · Data from the CMS NPPES public registry.