DR. JAMES MESROBIAN MD
NPI 1619936325
Anesthesiology in Summit, WI
About Dr. James Mesrobian Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JAMES MESROBIAN MD (NPI 1619936325) is an individual anesthesiology provider in Summit, Wisconsin, licensed in Wisconsin (45520) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with Ascension All Saints Hospital, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Other Identifiers 1
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. James Mesrobian Md 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 James Mesrobian reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Milwaukee, WI 53226
- Reassigned Medicare billing, Wisconsin enrollment
- 3,983 clinicians in this Medicare group
West Allis, WI 53227
- Reassigned Medicare billing, Wisconsin enrollment
- 4,609 clinicians in this Medicare group
Glendale, WI 53212
- Reassigned Medicare billing, Wisconsin enrollment
- 62 clinicians in this Medicare group
Mount Pleasant, WI 53405
- Reassigned Medicare billing, Wisconsin enrollment
- 162 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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ascension All Saints Hospital
Acute Care Hospitals · Racine, WIAurora Medical Center
Acute Care Hospitals · Grafton, WIOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SUMMIT, WI 53066
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 James Mesrobian's NPI number?
The NPI number for James Mesrobian is 1619936325. It was assigned to this individual provider in the NPPES registry on March 21, 2006.
Where is James Mesrobian located?
James Mesrobian practices at 36500 Aurora Dr, Summit, WI 53066. The listed phone number is (262) 434-1000.
What is James Mesrobian's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is James Mesrobian enrolled in Medicare?
Yes. James Mesrobian 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 James Mesrobian's services?
According to the CMS Revalidation Reassignment List (October 2026 release), James Mesrobian reassigns Medicare benefits to 4 organizations: The Medical College Of Wisconsin, Inc. (Milwaukee, WI), Aurora Medical Group, Inc. (West Allis, WI), Orthopaedic Hospital Of Wisconsin, LLC (Glendale, WI) and Racine Anesthesia Services, LLC (Mount Pleasant, WI). 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 James Mesrobian's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does James Mesrobian accept?
Health plans from CareSource (Common Ground Healthcare) list James Mesrobian 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 James Mesrobian affiliated with any hospitals?
According to CMS data, James Mesrobian is affiliated with Ascension All Saints Hospital and Aurora Medical Center.
When was this NPI record last updated?
The NPPES record for James Mesrobian was last updated on November 13, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Dr. James Mesrobian, MD · NPI 1619936325
Anesthesiology physician in Summit, Wisconsin. Individual provider, active in the CMS NPPES registry since March 21, 2006.
## Identity
- **NPI:** 1619936325 (Entity type: Individual)
- **Enumerated:** March 21, 2006
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 45520 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 36500 AURORA DR, Summit, WI 53066-4899
- **Phone:** (262) 434-1000
## 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): The Medical College Of Wisconsin, Inc. (NPI 1699720086, Milwaukee, WI); Aurora Medical Group, Inc. (NPI 1457592735, West Allis, WI); Orthopaedic Hospital Of Wisconsin, LLC (NPI 1669584983, Glendale, WI); Racine Anesthesia Services, LLC (NPI 1467782748, Mount Pleasant, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1989
## Record status
- **NPPES last updated:** November 13, 2025
- **Other identifiers:** Medicaid 1619936325 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1619936325) · Data from the CMS NPPES public registry.