MICHAEL DIAS MD
NPI 1831683556
Hospitalist in Ann Arbor, MI
About Michael Dias Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MICHAEL DIAS MD (NPI 1831683556) is an individual hospitalist provider in Ann Arbor, Michigan, licensed in California (208M00000X) and active in the NPI registry since June 2018. He is enrolled in Medicare PECOS and is a graduate of University Of Florida College Of Medicine (2018).
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
Michael Dias 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
6Medicare enrollment records show Michael Dias reassigns Medicare billing to 6 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
Ann Arbor, MI 48105
- Reassigned Medicare billing, Michigan enrollment
- 1,480 clinicians in this Medicare group
Chelsea, MI 48118
- Reassigned Medicare billing, Michigan enrollment
- 147 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 2,112 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 48109 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
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 Michael Dias's NPI number?
The NPI number for Michael Dias is 1831683556. It was assigned to this individual provider in the NPPES registry on June 16, 2018.
Where is Michael Dias located?
Michael Dias practices at 1500 E Medical Center Dr, Ann Arbor, MI 48109. The listed phone number is (734) 936-4000.
What is Michael Dias's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Michael Dias enrolled in Medicare?
Yes. Michael Dias 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 Dias's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Dias reassigns Medicare benefits to 6 organizations: Regents Of The University Of Michigan (Ann Arbor, MI), Iha Health Services Corporation (Ann Arbor, MI), Chelsea Community Hospital (Chelsea, MI), Regents Of The University Of California (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and 1 more organization, 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 Michael Dias's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Michael Dias accept?
Health plans from Priority Health list Michael Dias 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 Michael Dias was last updated on July 16, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Michael Dias, MD · NPI 1831683556
Hospitalist physician in Ann Arbor, Michigan. Individual provider, active in the CMS NPPES registry since June 16, 2018.
## Identity
- **NPI:** 1831683556 (Entity type: Individual)
- **Enumerated:** June 16, 2018
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** 208M00000X (California)
- **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:** 6 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of Michigan (NPI 1003848144, Ann Arbor, MI); Iha Health Services Corporation (NPI 1013194307, Ann Arbor, MI); Chelsea Community Hospital (NPI 1912947409, Chelsea, MI); Regents Of The University Of California (NPI 1235322348, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Florida College Of Medicine, class of 2018
## Record status
- **NPPES last updated:** July 16, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1831683556) · Data from the CMS NPPES public registry.