MARY KAY EWING MD
NPI 1609873348
Anesthesiology in Baltimore, MD
About Mary Kay Ewing Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY KAY EWING MD (NPI 1609873348) is an individual anesthesiology provider in Baltimore, Maryland, licensed in Maryland (D0041059) and active in the NPI registry since July 2005. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mary Kay Ewing Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Mary Kay Ewing reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Baltimore, MD 21287
- Reassigned Medicare billing, Maryland enrollment
- 4,483 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.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 13
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BALTIMORE, MD 21229
BALTIMORE, MD 21229
BALTIMORE, MD 21229
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 Mary Kay Ewing's NPI number?
The NPI number for Mary Kay Ewing is 1609873348. It was assigned to this individual provider in the NPPES registry on July 7, 2005.
Where is Mary Kay Ewing located?
Mary Kay Ewing practices at 900 Canton Ave Anesthesia Department, Baltimore, MD 21229. The listed phone number is (410) 368-3045.
What is Mary Kay Ewing's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Mary Kay Ewing enrolled in Medicare?
Yes. Mary Kay Ewing is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Mary Kay Ewing's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Kay Ewing reassigns Medicare benefits to Johns Hopkins University (Baltimore, MD). 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 Mary Kay Ewing's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mary Kay Ewing was last updated on July 3, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Mary Kay Ewing, MD · NPI 1609873348
Anesthesiology physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since July 7, 2005.
## Identity
- **NPI:** 1609873348 (Entity type: Individual)
- **Enumerated:** July 7, 2005
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** D0041059 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 900 CANTON AVE, ANESTHESIA DEPARTMENT, Baltimore, MD 21229
- **Phone:** (410) 368-3045
## 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:** Johns Hopkins University (NPI 1295731966, Baltimore, MD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 3, 2019
- **Other identifiers:** Medicaid 765011600 (MD)
---
Source: [NPI Profile](https://npiprofile.com/npi/1609873348) · Data from the CMS NPPES public registry.