JOHN MARKOS MAMALAKIS M.D.
NPI 1780726661
Anesthesiology in Madison, WI
About John Markos Mamalakis M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN MARKOS MAMALAKIS M.D. (NPI 1780726661) is an individual anesthesiology provider in Madison, Wisconsin, licensed in Illinois (036158414) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS, is affiliated with Elmhurst Memorial 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
John Markos Mamalakis 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
8Medicare enrollment records show John Mamalakis reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Middleton, WI 53562
- Reassigned Medicare billing, Wisconsin enrollment
- 2,832 clinicians in this Medicare group
Janesville, WI 53548
- Reassigned Medicare billing, Wisconsin and Illinois enrollments
- Also billed through NPI 1598718603 (Illinois)
- 1,155 clinicians in this Medicare group
Loves Park, IL 61111
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Rockford Anesthesiologists Associated LLC
- 32 clinicians in this Medicare group
Brookfield, WI 53045
- Reassigned Medicare billing, Wisconsin enrollment
- Medicare enrollment name: Brookfield Anesthesiologists Sc
- 31 clinicians in this Medicare group
Milwaukee, WI 53226
- Reassigned Medicare billing, Wisconsin enrollment
- 3,983 clinicians in this Medicare group
Woodstock, IL 60098
- Reassigned Medicare billing, Illinois enrollment
- 87 clinicians in this Medicare group
Oak Brook, IL 60523
- Reassigned Medicare billing, Illinois enrollment
- 63 clinicians in this Medicare group
Evanston, IL 60201
- Reassigned Medicare billing, Illinois enrollment
- 4,841 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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Elmhurst Memorial Hospital
Acute Care Hospitals · Elmhurst, ILUw Health
Acute Care Hospitals · Rockford, ILUniversity Of Wi Hospitals & Clinics Authority
Acute Care Hospitals · Madison, 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.
MADISON, WI 53792
MADISON, WI 53792
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 John Mamalakis's NPI number?
The NPI number for John Mamalakis is 1780726661. It was assigned to this individual provider in the NPPES registry on February 13, 2007.
Where is John Mamalakis located?
John Mamalakis practices at 600 Highland Ave, Madison, WI 53792. The listed phone number is (608) 263-8100.
What is John Mamalakis's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is John Mamalakis enrolled in Medicare?
Yes. John Mamalakis 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 John Mamalakis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Mamalakis reassigns Medicare benefits to 8 organizations: University Of Wisconsin Medical Foundation, Inc (Middleton, WI), Mercy Health System Corporation (Janesville, WI), Rockford Anesthesiologists Associated, L.L.C. (Loves Park, IL), Brookfield Anesthesiologists, S.C. (Brookfield, WI), The Medical College Of Wisconsin, Inc. (Milwaukee, WI) and 3 more organizations, listed in the Medicare section above. 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 John Mamalakis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Mamalakis accept?
Health plans from Group Health Cooperative-SCW list John Mamalakis 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 John Mamalakis affiliated with any hospitals?
According to CMS data, John Mamalakis is affiliated with Elmhurst Memorial Hospital, Uw Health and University Of Wi Hospitals & Clinics Authority.
When was this NPI record last updated?
The NPPES record for John Mamalakis was last updated on June 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# John Markos Mamalakis, M.D. · NPI 1780726661
Anesthesiology physician in Madison, Wisconsin. Individual provider, active in the CMS NPPES registry since February 13, 2007.
## Identity
- **NPI:** 1780726661 (Entity type: Individual)
- **Enumerated:** February 13, 2007
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 036158414 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 600 HIGHLAND AVE, Madison, WI 53792-0001
- **Phone:** (608) 263-8100
## 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:** 8 organizations under Medicare reassignment (form CMS-855R): University Of Wisconsin Medical Foundation, Inc (NPI 1598784555, Middleton, WI); Mercy Health System Corporation (NPI 1093768962, Janesville, WI); Rockford Anesthesiologists Associated, L.L.C. (NPI 1639128598, Loves Park, IL); Brookfield Anesthesiologists, S.C. (NPI 1942257902, Brookfield, WI); The Medical College Of Wisconsin, Inc. (NPI 1699720086, Milwaukee, WI); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Wisconsin School Of Medicine, class of 1999
## Record status
- **NPPES last updated:** June 9, 2026
- **Other identifiers:** Medicaid 34433800 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1780726661) · Data from the CMS NPPES public registry.