Jeffrey Warren, MD
NPI 1912089897 · Immunopathology Physician · Ann Arbor, MI
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jeffrey Warren, MD is a Immunopathology Physician provider in Ann Arbor, MI (NPI 1912089897).
Provider details
- NPI number
- 1912089897
- Entity type
- Individual
- Primary specialty
- Immunopathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 4301051563 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
2,285 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Protein Measurement, Serum84165 | 988 | $17 |
| Immunologic Analysis Technique on Serum (immunofixation)86334 | 588 | $17 |
| Protein Measurement, Body Fluid84166 | 216 | $17 |
| Protein Measurement, Serum84165 | 123 | $17 |
| Immunologic Analysis Technique on Serum (immunofixation)86334 | 99 | $17 |
| Screening Test for Antibody to Noninfectious Agent86255 | 79 | $17 |
| Immunologic Analysis Technique on Body Fluid, Other Fluids With Concentration |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-19
- Last updated
- 2019-05-07
Frequently asked questions
- What is Jeffrey Warren's NPI number?
- Jeffrey Warren's National Provider Identifier (NPI) is 1912089897, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jeffrey Warren's specialty?
- Jeffrey Warren is listed in the NPPES registry with a primary specialty of Immunopathology Physician (Allopathic & Osteopathic Physicians).
- Where is Jeffrey Warren located?
- Jeffrey Warren's practice location on file with NPPES is 1500 East Medical Center Dr, Ann Arbor, MI 48109-5054.
- What is Jeffrey Warren's phone number?
- The practice phone number listed in the NPPES registry for Jeffrey Warren is (800) 862-7284.
- Does Jeffrey Warren accept Medicare?
- Jeffrey Warren is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jeffrey Warren's NPI active?
- Yes — Jeffrey Warren's NPI (1912089897) is active in the NPPES registry as of the last update on 2019-05-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.