ROBERT A LARSON DO
NPI 1902546963
Internal Medicine in Rockford, IL
About Robert A Larson Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ROBERT A LARSON DO (NPI 1902546963) is an individual internal medicine provider in Rockford, Illinois, licensed in Illinois (036.179662) and active in the NPI registry since March 2022. He is enrolled in Medicare PECOS, is affiliated with Saint Anthony Medical Center, and is a graduate of Midwestern University, Chicago College Of Osteopathic Med (2022).
NPPES Registry Identity
Specialties & Licenses
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
Robert A Larson Do 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
2Medicare enrollment records show Robert Larson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Peoria, IL 61615
- Reassigned Medicare billing, Illinois enrollment
- 2,944 clinicians in this Medicare group
Lancaster, CA 93535
- Reassigned Medicare billing, California enrollment
- 2 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Saint Anthony Medical Center
Acute Care Hospitals · Rockford, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 61108 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
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 Robert Larson's NPI number?
The NPI number for Robert Larson is 1902546963. It was assigned to this individual provider in the NPPES registry on March 29, 2022.
Where is Robert Larson located?
Robert Larson practices at 5666 E State St, Rockford, IL 61108. The listed phone number is (815) 519-6087.
What is Robert Larson's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Robert Larson enrolled in Medicare?
Yes. Robert Larson 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 Robert Larson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Robert Larson reassigns Medicare benefits to 2 organizations: Osf Multi-Specialty Group (Peoria, IL) and Bartz-Altadonna Community Health Center (Lancaster, CA). 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 Robert Larson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Robert Larson affiliated with any hospitals?
According to CMS data, Robert Larson is affiliated with Saint Anthony Medical Center.
When was this NPI record last updated?
The NPPES record for Robert Larson was last updated on June 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Robert A Larson, DO · NPI 1902546963
Internal Medicine physician in Rockford, Illinois. Individual provider, active in the CMS NPPES registry since March 29, 2022.
## Identity
- **NPI:** 1902546963 (Entity type: Individual)
- **Enumerated:** March 29, 2022
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 036.179662 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 5666 E STATE ST, Rockford, IL 61108-2425
- **Phone:** (815) 519-6087
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Osf Multi-Specialty Group (NPI 1154908929, Peoria, IL); Bartz-Altadonna Community Health Center (NPI 1700672011, Lancaster, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Midwestern University, Chicago College Of Osteopathic Med, class of 2022
## Record status
- **NPPES last updated:** June 5, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1902546963) · Data from the CMS NPPES public registry.