Dr. Mark Louis Simpson, PHD, CCC/SLP
Dr. Mark Louis Simpson is a Speech-Language Pathologist provider (Speech-Language Pathologist) practicing in Detroit, MI, registered in the NPPES registry with NPI 1316055379 since 2006. The credential PHD stands for Doctor of Philosophy.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1316055379 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Mark Louis Simpson |
| Credential | PHD, CCC/SLP |
| Sex | Male |
| Practice address | 4100 JOHN R ST, KARMANOS CANCER CENTER-WERTZ CLINIC, Detroit, MI, 48201 |
| Phone | 8005276266 |
| Fax | 3135768381 |
| Enumeration date | 2006-08-29 |
| Last updated in NPPES | 2018-03-27 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 235Z00000X | Speech-Language Pathologist | Primary | — | — |
PHD — Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential
Copy-ready billing details
Provider: Mark Simpson, PHD, CCC/SLP NPI: 1316055379 Taxonomy: 235Z00000X (Speech-Language Pathologist) Address: 4100 JOHN R ST, KARMANOS CANCER CENTER-WERTZ CLINIC, Detroit, MI, 48201
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1073430138 | Kristen Moerchen | Individual | Acute Care Nurse Practitioner | Detroit, MI |
| 1518966316 | Cynthia Marsack | Individual | Nurse Practitioner | Detroit, MI |
| 1366443137 | Maria Vlachaki | Individual | Radiation Oncology Physician | Detroit, MI |
| 1669473146 | Deborah Olszewski | Individual | Nurse Practitioner | Detroit, MI |
| 1275520512 | Gina Fundaro | Individual | Diagnostic Radiology Physician | Detroit, MI |
| 1386632057 | Wasif Saif | Individual | Hematology & Oncology Physician | Detroit, MI |
| 1457332579 | Christine Rymal | Individual | Adult Health Nurse Practitioner | Detroit, MI |
| 1699756213 | Laurie Freeman-Gibb | Individual | Adult Health Nurse Practitioner | Detroit, MI |
Verify this record
Cross-check NPI 1316055379 against the authoritative CMS record: view Dr. Mark Louis Simpson 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
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2018-03-27.