JEFFREY S WARREN MD
NPI 1912089897
Pathology - Immunopathology in Ann Arbor, MI
About Jeffrey S Warren Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JEFFREY S WARREN MD (NPI 1912089897) is an individual immunopathology provider in Ann Arbor, Michigan, licensed in Michigan (4301051563) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, is affiliated with Promedica Coldwater Regional Hospital, and is a graduate of Ohio State University College Of Medicine (1980).
NPPES Registry Identity
Specialties & Licenses 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
Jeffrey S Warren 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 Reassignment
Medicare enrollment records show Jeffrey Warren reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Ann Arbor, MI 48109
- Reassigned Medicare billing, Michigan enrollment
- 133 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 11
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Promedica Coldwater Regional Hospital
Acute Care Hospitals · Coldwater, MIUniversity Of Michigan Health System
Acute Care Hospitals · Ann Arbor, MIPhysician 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
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 Jeffrey Warren's NPI number?
The NPI number for Jeffrey Warren is 1912089897. It was assigned to this individual provider in the NPPES registry on October 19, 2006.
Where is Jeffrey Warren located?
Jeffrey Warren practices at 1500 East Medical Center Dr 2nd Floor University Hospital Recp Pathology, Ann Arbor, MI 48109. The listed phone number is (800) 862-7284.
What is Jeffrey Warren's specialty?
The primary specialty registered for this NPI is Pathology, specializing in Immunopathology, with taxonomy code 207ZI0100X.
Is Jeffrey Warren enrolled in Medicare?
Yes. Jeffrey Warren 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 organization bills Medicare for Jeffrey Warren's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jeffrey Warren reassigns Medicare benefits to Regents Of The University Of Michigan (Ann Arbor, 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 Jeffrey Warren's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Jeffrey Warren accept?
Health plans from Priority Health list Jeffrey Warren 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 Jeffrey Warren affiliated with any hospitals?
According to CMS data, Jeffrey Warren is affiliated with Promedica Coldwater Regional Hospital and University Of Michigan Health System.
When was this NPI record last updated?
The NPPES record for Jeffrey Warren was last updated on May 7, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Jeffrey S Warren, MD · NPI 1912089897
Immunopathology physician in Ann Arbor, Michigan. Individual provider, active in the CMS NPPES registry since October 19, 2006.
## Identity
- **NPI:** 1912089897 (Entity type: Individual)
- **Enumerated:** October 19, 2006
- **Primary specialty:** Pathology - Immunopathology · taxonomy 207ZI0100X
- **State license:** 4301051563 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 1500 EAST MEDICAL CENTER DR, 2ND FLOOR UNIVERSITY HOSPITAL RECP PATHOLOGY, Ann Arbor, MI 48109-5054
- **Phone:** (800) 862-7284
## 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:** Regents Of The University Of Michigan (NPI 1508890468, Ann Arbor, MI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Ohio State University College Of Medicine, class of 1980
## Record status
- **NPPES last updated:** May 7, 2019
- **Other identifiers:** Medicaid 1871252 (MI)
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Source: [NPI Profile](https://npiprofile.com/npi/1912089897) · Data from the CMS NPPES public registry.