John Warren, MD
John Warren is a Clinical Pathology/Laboratory Medicine Physician provider (Pathology) practicing in Chicago, IL, registered in the NPPES registry with NPI 1104848563 since 2006. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1104848563 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | John Warren |
| Credential | MD |
| Sex | Male |
| Practice address | 680 N LAKE SHORE DR, SUITE 1000, Chicago, IL, 60611 |
| Phone | 3126959797 |
| Enumeration date | 2006-07-24 |
| Last updated in NPPES | 2007-07-08 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 207ZP0105X | Clinical Pathology/Laboratory Medicine Physician | Primary | — | IL |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Copy-ready billing details
Provider: John Warren, MD NPI: 1104848563 Taxonomy: 207ZP0105X (Clinical Pathology/Laboratory Medicine Physician) Address: 680 N LAKE SHORE DR, SUITE 1000, Chicago, IL, 60611
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1427052885 | Jeanette Dubay-Mcdermit | Individual | Certified Registered Nurse Anesthetist | Chicago, IL |
| 1669470936 | Michael Ruchim | Individual | Gastroenterology Physician | Chicago, IL |
| 1619977907 | Anne Wolfe | Individual | Clinical Psychologist | Chicago, IL |
| 1215939657 | Superior Orthopedics, Inc. | Organization | Durable Medical Equipment & Medical Supplies | Chicago, IL |
| 1023001187 | Parul Gupta | Individual | Obstetrics & Gynecology Physician | Chicago, IL |
| 1588651319 | Lakeshore Obstetrics and Gynecology LLC | Organization | Obstetrics Physician | Chicago, IL |
| 1932197134 | Shireen Ahmad | Individual | Anesthesiology Physician | Chicago, IL |
| 1689662942 | Abby Agulnek | Individual | Hospitalist Physician | Chicago, IL |
Verify this record
Cross-check NPI 1104848563 against the authoritative CMS record: view John Warren on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
Is this the official NPI registry?
What specialty is John Warren?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.