ISAIAH MARK HORTON MD
NPI 1053803940
Internal Medicine in Redlands, CA
About Isaiah Mark Horton Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ISAIAH MARK HORTON MD (NPI 1053803940) is an individual internal medicine provider in Redlands, California, licensed in California (A200368) and active in the NPI registry since June 2018. He is enrolled in Medicare PECOS, maintains a secondary practice location in Bethesda, and is a graduate of Loma Linda University School Of Medicine (2018).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Isaiah Mark Horton Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
6Medicare enrollment records show Isaiah Horton reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Redlands, CA 92373
- Reassigned Medicare billing, California enrollment
- 635 clinicians in this Medicare group
Fontana, CA 92335
- Reassigned Medicare billing, California enrollment
- 5,228 clinicians in this Medicare group
Murrieta, CA 92563
- Reassigned Medicare billing, California enrollment
- 13 clinicians in this Medicare group
Tustin, CA 92780
- Reassigned Medicare billing, California enrollment
- 2,052 clinicians in this Medicare group
Richmond, VA 23298
- Reassigned Medicare billing, Virginia enrollment
- 2,481 clinicians in this Medicare group
Baltimore, MD 21201
- Reassigned Medicare billing, Maryland enrollment
- Medicare enrollment name: University Of Maryland Physicians PA
- 614 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92373 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Isaiah Horton's NPI number?
The NPI number for Isaiah Horton is 1053803940. It was assigned to this individual provider in the NPPES registry on June 5, 2018.
Where is Isaiah Horton located?
Isaiah Horton practices at 245 Terracina Blvd Ste 105, Redlands, CA 92373. The listed phone number is (909) 335-4102.
What is Isaiah Horton's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Isaiah Horton enrolled in Medicare?
Yes. Isaiah Horton is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Isaiah Horton's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Isaiah Horton reassigns Medicare benefits to 6 organizations: Beaver Medical Group P C (Redlands, CA), Southern California Permanente Medical Group (Fontana, CA), Inland Empire Hospitalists Group (Murrieta, CA), Healthcare Partners Affiliates Medical Group (Tustin, CA), Mcv Associated Physicians (Richmond, VA) and 1 more organization, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Isaiah Horton's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Isaiah Horton was last updated on December 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Isaiah Mark Horton, MD · NPI 1053803940
Internal Medicine physician in Redlands, California. Individual provider, active in the CMS NPPES registry since June 5, 2018.
## Identity
- **NPI:** 1053803940 (Entity type: Individual)
- **Enumerated:** June 5, 2018
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A200368 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 245 TERRACINA BLVD STE 105, Redlands, CA 92373-4879
- **Phone:** (909) 335-4102
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 6 organizations under Medicare reassignment (form CMS-855R): Beaver Medical Group P C (NPI 1649503319, Redlands, CA); Southern California Permanente Medical Group (NPI 1689606196, Fontana, CA); Inland Empire Hospitalists Group (NPI 1497627137, Murrieta, CA); Healthcare Partners Affiliates Medical Group (NPI 1891981502, Tustin, CA); Mcv Associated Physicians (NPI 1710959457, Richmond, VA); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Loma Linda University School Of Medicine, class of 2018
## Record status
- **NPPES last updated:** December 17, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1053803940) · Data from the CMS NPPES public registry.