MARGARET ANNE MALLARI DO
NPI 1124518519
Internal Medicine in Baltimore, MD
About Margaret Anne Mallari Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET ANNE MALLARI DO (NPI 1124518519) is an individual internal medicine provider in Baltimore, Maryland, licensed in Maryland (H92410) and active in the NPI registry since May 2018. She is enrolled in Medicare PECOS, is affiliated with Johns Hopkins Bayview Medical Center, and maintains a secondary practice location in Atlantic City.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Margaret Anne Mallari Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Margaret Mallari reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baltimore, MD 21224
- Reassigned Medicare billing, Maryland enrollment
- 4,483 clinicians in this Medicare group
Baltimore, MD 21287
- Reassigned Medicare billing, Maryland enrollment
- 338 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Johns Hopkins Bayview Medical Center
Acute Care Hospitals · Baltimore, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21224 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 2
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 Margaret Mallari's NPI number?
The NPI number for Margaret Mallari is 1124518519. It was assigned to this individual provider in the NPPES registry on May 11, 2018.
Where is Margaret Mallari located?
Margaret Mallari practices at 5200 Eastern Ave Fl East2, Baltimore, MD 21224. The listed phone number is (410) 550-5018.
What is Margaret Mallari's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Margaret Mallari enrolled in Medicare?
Yes. Margaret Mallari is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Margaret Mallari's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Mallari reassigns Medicare benefits to 2 organizations: Johns Hopkins University (Baltimore, MD) and Johns Hopkins University (Baltimore, MD). 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 Margaret Mallari's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Margaret Mallari affiliated with any hospitals?
According to CMS data, Margaret Mallari is affiliated with Johns Hopkins Bayview Medical Center.
When was this NPI record last updated?
The NPPES record for Margaret Mallari was last updated on September 8, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Margaret Anne Mallari, DO · NPI 1124518519
Internal Medicine physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since May 11, 2018.
## Identity
- **NPI:** 1124518519 (Entity type: Individual)
- **Enumerated:** May 11, 2018
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** H92410 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 5200 EASTERN AVE FL EAST2, Baltimore, MD 21224-2734
- **Phone:** (410) 550-5018 · **Fax:** (410) 550-2972
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Johns Hopkins University (NPI 1306810619, Baltimore, MD); Johns Hopkins University (NPI 1902332133, Baltimore, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Rowan University School Of Osteopathic Medicine, class of 2018
## Record status
- **NPPES last updated:** September 8, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1124518519) · Data from the CMS NPPES public registry.