Michael Jon Sommerfeld, MD
Internal Medicine Physician · Lake Forest, IL
Michael Jon Sommerfeld, MD is an internal medicine physician with a practice address in Lake Forest, Illinois, and NPI 1578547063, issued on Nov 30, 2005. Check the license (Illinois 036105987, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Michael Jon Sommerfeld
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036105987 IL
Self-reported in NPPES; status is on the state search - Practice location
- 915 S Waukegan RD Ste 200, Lake Forest, IL 60045
- Phone
- (224) 516-4108
- Enumerated
- Nov 30, 2005
- Record last updated
- Jun 17, 2026
- Fax
- (224) 516-4116
- Medicaid ID
- 036105987 IL
- Medicare enrollment
- Enrolled (PECOS I20040525000463); accepts Medicare assignment
- Medical or professional school
- R Franklin University Of Med & Sci/Chicago Medical School, 1999
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 915 S Waukegan RD Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Barry Levin, M.D.Internal Medicine Physician1043324254
- Vivian SalazarInternal Medicine Physician1184704595
Verify Michael Jon Sommerfeld 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 036105987Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
17% more Medicare Part D claims than the average internal medicine physician in 2024
3,715 Medicare Part D claims for 255 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 109 claims were for opioids.
Most prescribed
- Atorvastatin Calcium167 claims
- Rosuvastatin Calcium116 claims
- Amlodipine Besylate115 claims
- Levothyroxine Sodium110 claims
- Olmesartan Medoxomil106 claims
- Synthroid91 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.
The MIPS final score for 2023 (Medicare payment program): 93.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $25.12
1 payment: food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Bills Medicare through one group practice
- Endeavor Health Medical GroupEvanston, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Jon Sommerfeld among 7,238 internal medicine physician records in Illinois
Michael Jon Sommerfeld, MD 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated1999 · 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).
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 Michael Jon Sommerfeld, MD's NPI number?
Michael Jon Sommerfeld, MD's National Provider Identifier (NPI) is 1578547063, issued on Nov 30, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Michael Jon Sommerfeld, MD located?
The NPPES record lists a practice address at 915 S Waukegan RD Ste 200, Lake Forest, IL, 60045. Phone: (224) 516-4108. Providers update this record themselves, so call before visiting.
How can I verify Michael Jon Sommerfeld, MD's license?
NPPES lists Illinois license number 036105987, 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 Michael Jon Sommerfeld, MD prescribe under Medicare Part D?
In 2024, Michael Jon Sommerfeld, MD had 3,715 Medicare Part D claims for 255 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Michael Jon Sommerfeld, MD's MIPS final score?
The 2023 MIPS final score is 93.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.