Mark L Harrison, MD
Mark L Harrison is a Radiation Oncology Physician provider (Radiology) practicing in Mcallen, TX, registered in the NPPES registry with NPI 1417954124 since 2005. The credential MD stands for Doctor of Medicine. Practices at Radiation Medicine Associates (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1417954124 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Mark L Harrison |
| Credential | MD |
| Sex | Male |
| Practice address | 620 S BROADWAY ST, Mcallen, TX, 78501 |
| Phone | 9566829680 |
| Fax | 9566829915 |
| Enumeration date | 2005-07-07 |
| Last updated in NPPES | 2007-07-08 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 2085R0001X | Radiation Oncology Physician | Primary | G4598 | TX |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 96320902 | Medicaid | TX | — |
Copy-ready billing details
Provider: Mark Harrison, MD NPI: 1417954124 Taxonomy: 2085R0001X (Radiation Oncology Physician) Address: 620 S BROADWAY ST, Mcallen, TX, 78501
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1528150018 | Radiation Medicine Associates | Organization | Radiation Oncology Physician | Mcallen, TX |
| 1598995607 | Marivel Cavazos-Pantoja | Individual | Family Nurse Practitioner | Mcallen, TX |
Verify this record
Cross-check NPI 1417954124 against the authoritative CMS record: view Mark L Harrison 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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Is NPI 1417954124 active?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.