L Robert Warren, MD
Family Medicine Physician · Belvidere, IL
L Robert Warren, MD is a family medicine physician with a practice address in Belvidere, Illinois, and NPI 1558341933, issued on Jan 20, 2006. Check the license (Illinois 036061249, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- L Robert Warren
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 036061249 IL
Self-reported in NPPES; status is on the state search - Practice location
- 205 Cadillac CT, Belvidere, IL 61008
- Phone
- (815) 544-0444
- Enumerated
- Jan 20, 2006
- Record last updated
- Jul 18, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (815) 544-0652
- Medicaid ID
- 036061249 IL
- Medicare enrollment
- Enrolled (PECOS I20040819000366); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 1979
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →
Verify L Robert Warren 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 036061249Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
59% fewer Medicare Part D claims than the average family medicine physician in 2024
1,456 Medicare Part D claims for 96 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 28 claims were for opioids.
Most prescribed
- Atorvastatin Calcium138 claims
- Metoprolol Succinate82 claims
- Amlodipine Besylate74 claims
- Levothyroxine Sodium73 claims
- Losartan Potassium64 claims
- Lisinopril51 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.
Industry payments in 2024: $1,301.37
35 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
L Robert Warren among 6,215 family medicine physician records in Illinois
L Robert Warren, MD is one of 6,215 family medicine physician records with a practice address in Illinois. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1979 · median 2006 among the 3,714 with a school on file
- Record last updated2007 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
20 family medicine physician records list a practice address in Belvidere
They are 20 of the 194 NPPES records with a practice address in Belvidere, and 6,215 family medicine physician records in Illinois.
All 6,215 in Illinois → Every provider in Belvidere → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Shin Chen, MDBelvidere, IL 610081437139896
- Karen Englund, MDBelvidere, IL 610081407872591
- Stephanie Gorham, MDBelvidere, IL 610081023239258
- Neal Kellenberger, MDBelvidere, IL 610081427210319
- Mohammed Khan, MDBelvidere, IL 610081679703797
- Cassandra Lopez, MDBelvidere, IL 610081619125317
- Therese Lucietto-Sieradzki, M.D.Belvidere, IL 610081699708636
- Clayton Malaker, M.D.Belvidere, IL 610081144221961
Common questions
What is L Robert Warren, MD's NPI number?
L Robert Warren, MD's National Provider Identifier (NPI) is 1558341933, issued on Jan 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is L Robert Warren, MD located?
The NPPES record lists a practice address at 205 Cadillac CT, Belvidere, IL, 61008. Phone: (815) 544-0444. Providers update this record themselves, so call before visiting.
How can I verify L Robert Warren, MD's license?
NPPES lists Illinois license number 036061249, 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 L Robert Warren, MD prescribe under Medicare Part D?
In 2024, L Robert Warren, MD had 1,456 Medicare Part D claims for 96 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.