NICHOLAS WILLIAM RIZER
NPI 1427635184
Emergency Medicine in Baltimore, MD
About Nicholas William Rizer NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NICHOLAS WILLIAM RIZER (NPI 1427635184) is an individual emergency medicine provider in Baltimore, Maryland, licensed in Maryland (D0100470) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS, is affiliated with Mercy Medical Center Inc, and is a graduate of Other (2021).
NPPES Registry Identity
Specialties & Licenses
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
Nicholas William Rizer 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
3Medicare enrollment records show Nicholas Rizer reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baltimore, MD 21287
- Reassigned Medicare billing, Maryland enrollment
- 4,483 clinicians in this Medicare group
Baltimore, MD 21202
- Reassigned Medicare billing, Maryland enrollment
- 66 clinicians in this Medicare group
Baltimore, MD 21201
- Reassigned Medicare billing, Maryland enrollment
- 234 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.
Mercy Medical Center Inc
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.
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
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 Nicholas Rizer's NPI number?
The NPI number for Nicholas Rizer is 1427635184. It was assigned to this individual provider in the NPPES registry on March 26, 2021.
Where is Nicholas Rizer located?
Nicholas Rizer practices at 1830 E Monument St Ste 6-100, Baltimore, MD 21287. The listed phone number is (410) 955-5000.
What is Nicholas Rizer's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Nicholas Rizer enrolled in Medicare?
Yes. Nicholas Rizer 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 Nicholas Rizer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Rizer reassigns Medicare benefits to 3 organizations: Johns Hopkins University (Baltimore, MD), Emergency Physicians Spps (Baltimore, MD) and University Of Maryland Emergency Medicine Associates, PA (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 Nicholas Rizer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Nicholas Rizer affiliated with any hospitals?
According to CMS data, Nicholas Rizer is affiliated with Mercy Medical Center Inc.
When was this NPI record last updated?
The NPPES record for Nicholas Rizer was last updated on November 5, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 months 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.
# Nicholas William Rizer · NPI 1427635184
Emergency Medicine physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since March 26, 2021.
## Identity
- **NPI:** 1427635184 (Entity type: Individual)
- **Enumerated:** March 26, 2021
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** D0100470 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 1830 E MONUMENT ST STE 6-100, Baltimore, MD 21287-0020
- **Phone:** (410) 955-5000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Johns Hopkins University (NPI 1023018413, Baltimore, MD); Emergency Physicians Spps (NPI 1760885958, Baltimore, MD); University Of Maryland Emergency Medicine Associates, PA (NPI 1811704208, Baltimore, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** November 5, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1427635184) · Data from the CMS NPPES public registry.