JOANNA MATTIS M.D.
NPI 1245626449
Psychiatry & Neurology - Epilepsy
in Ann Arbor, MI
About Joanna Mattis M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOANNA MATTIS M.D. (NPI 1245626449) is an individual epilepsy provider in Ann Arbor, Michigan, licensed in Michigan (4301506606) and active in the NPI registry since April 2015. She is enrolled in Medicare PECOS, is affiliated with University Of Michigan Health System, and is a graduate of Stanford University School Of Medicine (2015).
NPPES Registry Identity
Specialties & Licenses 2
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
Joanna Mattis 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 Joanna Mattis reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Ann Arbor, MI 48109
- Reassigned Medicare billing, Michigan enrollment
- 2,377 clinicians in this Medicare group
Grand Rapids, MI 49546
- Reassigned Medicare billing, Michigan enrollment
- 685 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
University Of Michigan Health System
Acute Care Hospitals · Ann Arbor, MIOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
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 Joanna Mattis's NPI number?
The NPI number for Joanna Mattis is 1245626449. It was assigned to this individual provider in the NPPES registry on April 14, 2015.
Where is Joanna Mattis located?
Joanna Mattis practices at 1500 E Medical Center Dr, Ann Arbor, MI 48109. The listed phone number is (734) 936-4000.
What is Joanna Mattis's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Epilepsy, with taxonomy code 2084E0001X.
Is Joanna Mattis enrolled in Medicare?
Yes. Joanna Mattis 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 Joanna Mattis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Joanna Mattis reassigns Medicare benefits to 2 organizations: Regents Of The University Of Michigan (Ann Arbor, MI) and Metropolitan Hospital (Grand Rapids, MI). 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 Joanna Mattis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Joanna Mattis accept?
Health plans from Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company, McLaren Health Plan Community and Priority Health list Joanna Mattis 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 Joanna Mattis affiliated with any hospitals?
According to CMS data, Joanna Mattis is affiliated with University Of Michigan Health System.
When was this NPI record last updated?
The NPPES record for Joanna Mattis was last updated on December 30, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 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.
# Joanna Mattis, M.D. · NPI 1245626449
Epilepsy physician in Ann Arbor, Michigan. Individual provider, active in the CMS NPPES registry since April 14, 2015.
## Identity
- **NPI:** 1245626449 (Entity type: Individual)
- **Enumerated:** April 14, 2015
- **Primary specialty:** Psychiatry & Neurology - Epilepsy · taxonomy 2084E0001X
- **State license:** 4301506606 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 1500 E MEDICAL CENTER DR, Ann Arbor, MI 48109-5000
- **Phone:** (734) 936-4000
## 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): Regents Of The University Of Michigan (NPI 1003848144, Ann Arbor, MI); Metropolitan Hospital (NPI 1720590961, Grand Rapids, MI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Stanford University School Of Medicine, class of 2015
## Record status
- **NPPES last updated:** December 30, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1245626449) · Data from the CMS NPPES public registry.