DR. MICHAEL GREENBERG M.D.
NPI 1104213768
Anesthesiology - Critical Care Medicine in Baltimore, MD
About Dr. Michael Greenberg M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MICHAEL GREENBERG M.D. (NPI 1104213768) is an individual critical care medicine provider in Baltimore, Maryland, licensed in Maryland (D87029) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS, is affiliated with Ns/lij Hs Southside Hospital, and maintains a secondary practice location in New Hyde Park.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
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. Michael Greenberg 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
2Medicare enrollment records show Michael Greenberg reassigns Medicare billing to 2 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
Chappaqua, NY 10514
- Reassigned Medicare billing, New York enrollment
- 1,406 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.
Ns/Lij Hs Southside Hospital
Acute Care Hospitals · Bay Shore, NYOther 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
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 Michael Greenberg's NPI number?
The NPI number for Michael Greenberg is 1104213768. It was assigned to this individual provider in the NPPES registry on April 22, 2015.
Where is Michael Greenberg located?
Michael Greenberg practices at 600 N Wolfe St, Baltimore, MD 21287. The listed phone number is (410) 955-5000.
What is Michael Greenberg's specialty?
The primary specialty registered for this NPI is Anesthesiology, specializing in Critical Care Medicine, with taxonomy code 207LC0200X.
Is Michael Greenberg enrolled in Medicare?
Yes. Michael Greenberg 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 Michael Greenberg's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Greenberg reassigns Medicare benefits to 2 organizations: Johns Hopkins University (Baltimore, MD) and North Shore - Lij Anesthesiology, PC (Chappaqua, NY). 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 Michael Greenberg's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Michael Greenberg affiliated with any hospitals?
According to CMS data, Michael Greenberg is affiliated with Ns/Lij Hs Southside Hospital.
When was this NPI record last updated?
The NPPES record for Michael Greenberg was last updated on April 27, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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. Michael Greenberg, M.D. · NPI 1104213768
Critical Care Medicine physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since April 22, 2015.
## Identity
- **NPI:** 1104213768 (Entity type: Individual)
- **Enumerated:** April 22, 2015
- **Primary specialty:** Anesthesiology - Critical Care Medicine · taxonomy 207LC0200X
- **State license:** D87029 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 600 N WOLFE ST, Baltimore, MD 21287
- **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:** 2 organizations under Medicare reassignment (form CMS-855R): Johns Hopkins University (NPI 1023018413, Baltimore, MD); North Shore - Lij Anesthesiology, PC (NPI 1417401266, Chappaqua, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** April 27, 2019
- **Other identifiers:** Other D87029 (MD)
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Source: [NPI Profile](https://npiprofile.com/npi/1104213768) · Data from the CMS NPPES public registry.