ERIC ALVIN RITTER MD
NPI 1659557593
Hospitalist in Baltimore, MD
About Eric Alvin Ritter Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ERIC ALVIN RITTER MD (NPI 1659557593) is an individual hospitalist provider in Baltimore, Maryland, licensed in Maryland (D71390) and active in the NPI registry since January 2008. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Meharry Medical College School Of Medicine (2006).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Eric Alvin Ritter Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Eric Ritter reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baltimore, MD 21223
- Reassigned Medicare billing, Maryland enrollment
Pasadena, MD 21122
- Reassigned Medicare billing, Maryland enrollment
- 794 clinicians in this Medicare group
Annapolis, MD 21401
- Reassigned Medicare billing, Maryland enrollment
- 73 clinicians in this Medicare group
Frederick, MD 21701
- Reassigned Medicare billing, District of Columbia enrollment
- 204 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
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21223 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BALTIMORE, MD 21223
BALTIMORE, MD 21223
BALTIMORE, MD 21223
BALTIMORE, MD 21223
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 Eric Ritter's NPI number?
The NPI number for Eric Ritter is 1659557593. It was assigned to this individual provider in the NPPES registry on January 10, 2008.
Where is Eric Ritter located?
Eric Ritter practices at 1335 W Baltimore St, Baltimore, MD 21223. The listed phone number is (240) 856-3375.
What is Eric Ritter's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Eric Ritter enrolled in Medicare?
Yes. Eric Ritter is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Eric Ritter's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Eric Ritter reassigns Medicare benefits to 4 organizations: Warrior4god Addiction Medicine (Baltimore, MD), Luminis Health Medical Group, LLC (Pasadena, MD), Mdics At Anne Arundel LLC (Annapolis, MD) and Hospitalist Medicine Physicians Of Maryland PC (Frederick, 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 Eric Ritter'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 Eric Ritter was last updated on December 17, 2021. 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.
# Eric Alvin Ritter, MD · NPI 1659557593
Hospitalist physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since January 10, 2008.
## Identity
- **NPI:** 1659557593 (Entity type: Individual)
- **Enumerated:** January 10, 2008
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** D71390 (Maryland)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1335 W BALTIMORE ST, Baltimore, MD 21223-2402
- **Phone:** (240) 856-3375
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Warrior4god Addiction Medicine (NPI 1386303675, Baltimore, MD); Luminis Health Medical Group, LLC (NPI 1063837490, Pasadena, MD); Mdics At Anne Arundel LLC (NPI 1427343664, Annapolis, MD); Hospitalist Medicine Physicians Of Maryland PC (NPI 1992945471, Frederick, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Meharry Medical College School Of Medicine, class of 2006
## Record status
- **NPPES last updated:** December 17, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1659557593) · Data from the CMS NPPES public registry.