MARIAH ROBERTSON M.D.
NPI 1639556590
Internal Medicine in Baltimore, MD
About Mariah Robertson M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIAH ROBERTSON M.D. (NPI 1639556590) is an individual internal medicine provider in Baltimore, Maryland, licensed in Maryland (D85250) and active in the NPI registry since April 2015. She is enrolled in Medicare PECOS, is affiliated with Johns Hopkins Hospital, The, and is a graduate of University Of Missouri, Columbia School Of Medicine (2014).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mariah Robertson M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Mariah Robertson 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, District of Columbia and Maryland enrollments
- Also billed through NPI 1124629837 (Maryland)
- 691 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.
Johns Hopkins Hospital, The
Acute Care Hospitals · Baltimore, MDJohns 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 2
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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BALTIMORE, MD 21224
BALTIMORE, MD 21224
BALTIMORE, MD 21224
BALTIMORE, MD 21224
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 Mariah Robertson's NPI number?
The NPI number for Mariah Robertson is 1639556590. It was assigned to this individual provider in the NPPES registry on April 29, 2015. The provider is also known as Mariah Dewsnap-Dreisinger M.D..
Where is Mariah Robertson located?
Mariah Robertson practices at 4940 Eastern Ave, Baltimore, MD 21224. The listed phone number is (410) 550-0535.
What is Mariah Robertson's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mariah Robertson enrolled in Medicare?
Yes. Mariah Robertson is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Mariah Robertson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mariah Robertson reassigns Medicare benefits to 2 organizations: Johns Hopkins University (Baltimore, MD) and Johns Hopkins Community Physicians, Inc (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 Mariah Robertson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mariah Robertson affiliated with any hospitals?
According to CMS data, Mariah Robertson is affiliated with Johns Hopkins Hospital, The and Johns Hopkins Bayview Medical Center.
When was this NPI record last updated?
The NPPES record for Mariah Robertson was last updated on October 5, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Mariah Robertson, M.D. · NPI 1639556590
Internal Medicine physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since April 29, 2015.
## Identity
- **NPI:** 1639556590 (Entity type: Individual)
- **Enumerated:** April 29, 2015
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** D85250 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 4940 EASTERN AVE, Baltimore, MD 21224-2735
- **Phone:** (410) 550-0535 · **Fax:** (410) 550-0491
## 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 Community Physicians, Inc (NPI 1255359972, Baltimore, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Missouri, Columbia School Of Medicine, class of 2014
## Record status
- **NPPES last updated:** October 5, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1639556590) · Data from the CMS NPPES public registry.