Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Isaiah Mark Horton, MD

Individual provider Internal Medicine Physician · NPI 1053803940

Isaiah Mark Horton, MD is an Internal Medicine in Redlands, California. Graduated from Loma Linda University School of Medicine in 2018, 8 years ago. Practices with Southern California Permanente Medical Group, an 11,242-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California and Virginia.

Years since qualifying
8
Trained at
Loma Linda University School of Medicine
Licensed in
CA, VA
In the registry since
2018
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

245 Terracina Blvd Ste 105
Redlands, CA 92373-4879
Phone: (909) 335-4102
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • Walter Reed National Military Medical Center, Bethesda, MD 20889-0001 — (301) 295-4900

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence A200368 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 0101268175 (VA)

Record details

NPI number1053803940
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 5, 2018
Last updated in NPPESDecember 17, 2025
Certification dateDecember 17, 2025
Mailing addressPo Box 35380, Las Vegas, NV 89133-5380

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolLOMA LINDA UNIVERSITY SCHOOL OF MEDICINE
Graduated 2018 (8 years in practice)
Group practice Southern California Permanente Medical Group — 11242 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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