SIERRA GILLIS
NPI 1033728613
Psychologist in Detroit, MI
About Sierra Gillis NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SIERRA GILLIS (NPI 1033728613) is an individual psychologist in Detroit, Michigan, licensed in Michigan (6352000029) and active in the NPI registry since July 2020. She is enrolled in Medicare PECOS and is a graduate of Other (2023).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Sierra Gillis is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Sierra Gillis reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Monroe, MI 48162
- Reassigned Medicare billing, Michigan enrollment
- 8 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.
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.
DETROIT, MI 48205
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 Sierra Gillis's NPI number?
The NPI number for Sierra Gillis is 1033728613. It was assigned to this individual provider in the NPPES registry on July 29, 2020.
Where is Sierra Gillis located?
Sierra Gillis practices at 15000 Gratiot Ave, Detroit, MI 48205. The listed phone number is (313) 423-3067.
What is Sierra Gillis's specialty?
The primary specialty registered for this NPI is Psychologist with taxonomy code 103T00000X.
Is Sierra Gillis enrolled in Medicare?
Yes. Sierra Gillis is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Sierra Gillis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sierra Gillis reassigns Medicare benefits to Mini Mitten Pediatric Therapy, LLC (Monroe, MI). The 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 Sierra Gillis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Sierra Gillis accept?
Health plans from Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company, Oscar Insurance Company, Paramount and Priority Health and 1 other insurer list Sierra Gillis 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.
When was this NPI record last updated?
The NPPES record for Sierra Gillis was last updated on July 29, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.