Robert A. Larson, DO
Internal Medicine Physician · Rockford, IL
Robert A. Larson, DO is an internal medicine physician with a practice address in Rockford, Illinois, and NPI 1902546963, issued on Mar 29, 2022. Check the license (Illinois 036.179662, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Robert A. Larson
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036.179662 IL
Self-reported in NPPES; status is on the state search - Practice location
- 5666 E State St, Rockford, IL 61108
- Phone
- (815) 519-6087
- Enumerated
- Mar 29, 2022
- Record last updated
- Jun 5, 2026
- Medicare enrollment
- Enrolled (PECOS I20260612000598); may accept Medicare assignment
- Medical or professional school
- Midwestern University, Chicago College Of Osteopathic Med, 2022
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 5666 E State St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Robert A. Larson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036.179662Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average internal medicine physician in 2024
373 Medicare Part D claims for 94 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Amlodipine Besylate21 claims
- Atorvastatin Calcium18 claims
- Levothyroxine Sodium14 claims
- Pantoprazole Sodium13 claims
- Prednisone13 claims
- Niacin Er11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Robert A. Larson among 7,238 internal medicine physician records in Illinois
Robert A. Larson, DO is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 78% of them.
- NPI issued2022 · 78% of these records are older, 18% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2022 · median 2003 among the 3,580 with a school on file
- Record last updated2026 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
82 internal medicine physician records list a practice address in Rockford
They are 82 of the 3,893 NPPES records with a practice address in Rockford, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Rockford → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Joyce Cheng, MDRockford, IL 611081407310733
- Zackary Franzen, MDRockford, IL 611081851851018
- Srinivas Gullapalli, M.D.Rockford, IL 611081932356763
- Jennis Iruke, MDRockford, IL 611081558538041
- Binoy Kamal, M.D.Rockford, IL 611081295805174
- Rajyalaxmi Mullapudi, M.D.Rockford, IL 611081013953546
- Dileep Kumar Reddy RegallaRockford, IL 611081194379867
- Christine Simaytis, M.D.Rockford, IL 611081629176060
Common questions
What is Robert A. Larson, DO's NPI number?
Robert A. Larson, DO's National Provider Identifier (NPI) is 1902546963, issued on Mar 29, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Robert A. Larson, DO located?
The NPPES record lists a practice address at 5666 E State St, Rockford, IL, 61108. Phone: (815) 519-6087. Providers update this record themselves, so call before visiting.
How can I verify Robert A. Larson, DO's license?
NPPES lists Illinois license number 036.179662, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert A. Larson, DO prescribe under Medicare Part D?
In 2024, Robert A. Larson, DO had 373 Medicare Part D claims for 94 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.