DR. MARI LOUISE GROVES M.D.
NPI 1598964439
Neurological Surgery in Baltimore, MD
About Dr. Mari Louise Groves M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARI LOUISE GROVES M.D. (NPI 1598964439) is an individual neurological surgery provider in Baltimore, Maryland, licensed in Maryland (D73227) and active in the NPI registry since July 2007. She is enrolled in Medicare PECOS, is affiliated with Johns Hopkins Hospital, The, and is a graduate of Vanderbilt University School Of Medicine (2007).
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. Mari Louise Groves 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 Mari Groves reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baltimore, MD 21205
- Reassigned Medicare billing, Maryland enrollment
- 352 clinicians in this Medicare group
Columbia, MD 21045
- Reassigned Medicare billing, Maryland enrollment
- 41 clinicians in this Medicare group
Fairfax, VA 22031
- Reassigned Medicare billing, District of Columbia and Virginia enrollments
- 2,618 clinicians in this Medicare group
Philadelphia, PA 19140
- Reassigned Medicare billing, Pennsylvania enrollment
- 83 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Johns Hopkins Hospital, The
Acute Care Hospitals · Baltimore, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21287 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.
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 21287
BALTIMORE, MD 21287
BALTIMORE, MD 21287
BALTIMORE, MD 21287
BALTIMORE, MD 21287
BALTIMORE, MD 21287
BALTIMORE, MD 21287
BALTIMORE, MD 21287
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 Mari Groves's NPI number?
The NPI number for Mari Groves is 1598964439. It was assigned to this individual provider in the NPPES registry on July 11, 2007.
Where is Mari Groves located?
Mari Groves practices at The Johns Hopkins Hospital 600 North Wolfe Street, Phipps 556, Baltimore, MD 21287. The listed phone number is (410) 955-7851.
What is Mari Groves's specialty?
The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.
Is Mari Groves enrolled in Medicare?
Yes. Mari Groves 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 Mari Groves's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mari Groves reassigns Medicare benefits to 4 organizations: Kennedy Krieger Associates (Baltimore, MD), University Of Maryland Neurosurgery Associates P A (Columbia, MD), Inova Health Care Services (Fairfax, VA) and Shriners Hospitals For Children (Philadelphia, PA). 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 Mari Groves's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mari Groves accept?
Health plans from Oscar Health list Mari Groves 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 Mari Groves affiliated with any hospitals?
According to CMS data, Mari Groves is affiliated with Johns Hopkins Hospital, The.
When was this NPI record last updated?
The NPPES record for Mari Groves was last updated on August 19, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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. Mari Louise Groves, M.D. · NPI 1598964439
Neurological Surgery physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since July 11, 2007.
## Identity
- **NPI:** 1598964439 (Entity type: Individual)
- **Enumerated:** July 11, 2007
- **Primary specialty:** Neurological Surgery · taxonomy 207T00000X
- **State license:** D73227 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** THE JOHNS HOPKINS HOSPITAL, 600 NORTH WOLFE STREET, PHIPPS 556, Baltimore, MD 21287-0001
- **Phone:** (410) 955-7851 · **Fax:** (410) 955-7862
## 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): Kennedy Krieger Associates (NPI 1164220042, Baltimore, MD); University Of Maryland Neurosurgery Associates P A (NPI 1639119035, Columbia, MD); Inova Health Care Services (NPI 1669511051, Fairfax, VA); Shriners Hospitals For Children (NPI 1275271462, Philadelphia, PA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Vanderbilt University School Of Medicine, class of 2007
## Record status
- **NPPES last updated:** August 19, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1598964439) · Data from the CMS NPPES public registry.