Richard Justus Siebert, M.D.
Internal Medicine Physician · Lake Forest, IL
Richard Justus Siebert, M.D. is an internal medicine physician with a practice address in Lake Forest, Illinois, and NPI 1205985157, issued on Jan 9, 2007. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Richard Justus Siebert
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 700 N Westmoreland RD, Lake Forest, IL 60045
- Phone
- (847) 234-8808
- Enumerated
- Jan 9, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 700 N Westmoreland RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Richard Justus Siebert in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional RegulationCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% fewer Medicare Part D claims than the average internal medicine physician in 2024
777 Medicare Part D claims for 148 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Levothyroxine Sodium129 claims
- Atorvastatin Calcium74 claims
- Hydrochlorothiazide68 claims
- Synthroid61 claims
- Losartan Potassium49 claims
- Amlodipine Besylate40 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.
Richard Justus Siebert among 7,238 internal medicine physician records in Illinois
Richard Justus Siebert, M.D. 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 2007, is newer than 39% of them.
- NPI issued2007 · 39% of these records are older, 55% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2007 · 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).
25 internal medicine physician records list a practice address in Lake Forest
They are 25 of the 821 NPPES records with a practice address in Lake Forest, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Lake Forest → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Scott Braunlich, M.D.Lake Forest, IL 600451487638904
- Elisabeth Cormier, MDLake Forest, IL 600451891781241
- Jason Garti, M.D.Lake Forest, IL 600451003890500
- Sam Hull, MDLake Forest, IL 600451053319277
- Steven Lasin, MDLake Forest, IL 600451477574945
- Barry Levin, M.D.Lake Forest, IL 600451043324254
- Han Chung NgLake Forest, IL 600451558476622
- Amar Peruri, MDLake Forest, IL 600451184726499
Common questions
What is Richard Justus Siebert, M.D.'s NPI number?
Richard Justus Siebert, M.D.'s National Provider Identifier (NPI) is 1205985157, issued on Jan 9, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Richard Justus Siebert, M.D. located?
The NPPES record lists a practice address at 700 N Westmoreland RD, Lake Forest, IL, 60045. Phone: (847) 234-8808. Providers update this record themselves, so call before visiting.
How can I verify Richard Justus Siebert, M.D.'s license?
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 Richard Justus Siebert, M.D. prescribe under Medicare Part D?
In 2024, Richard Justus Siebert, M.D. had 777 Medicare Part D claims for 148 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.