Sarah E. Messmer, MD
Internal Medicine Physician · Chicago, IL
Sarah E. Messmer, MD is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1073926929, issued on Jun 9, 2014. Check the license (Illinois 036.145844, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Sarah E. Messmer
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 036.145844 IL
L-259415 MA
Self-reported in NPPES; status is on the state search - Practice location
- 840 S Wood St, Chicago, IL 60612
- Phone
- (312) 996-4242
- Enumerated
- Jun 9, 2014
- Record last updated
- Oct 31, 2025
- Medicare enrollment
- Enrolled (PECOS I20250718000046); may accept Medicare assignment
- Medical or professional school
- Harvard Medical School, 2014
- Entity
- Type 1 · individual
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Verify Sarah E. Messmer 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 036.145844Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 87.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Sarah E. Messmer among 7,238 internal medicine physician records in Illinois
Sarah E. Messmer, 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 2014, is newer than 59% of them.
- NPI issued2014 · 59% of these records are older, 39% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2014 · median 2003 among the 3,580 with a school on file
- Record last updated2025 · 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).
2,867 internal medicine physician records list a practice address in Chicago
They are 2,867 of the 63,379 NPPES records with a practice address in Chicago, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Chicago → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Keith Boyd, M.D.Chicago, IL 606121174591978
- Lewis Coulson, M.D.Chicago, IL 606121619944931
- Henry Danko, M.D.Chicago, IL 606121780659524
- Denis Evans, M.D.Chicago, IL 606121952385841
- Tabassum Faruqi, M.D.Chicago, IL 606121013968536
- David Goldberg, MDChicago, IL 606121275588444
- Ionut Ilie, M.D.Chicago, IL 606121619926383
- Padma Kudaravalli, M.D.Chicago, IL 606121427004514
Common questions
What is Sarah E. Messmer, MD's NPI number?
Sarah E. Messmer, MD's National Provider Identifier (NPI) is 1073926929, issued on Jun 9, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Sarah E. Messmer, MD located?
The NPPES record lists a practice address at 840 S Wood St, Chicago, IL, 60612. Phone: (312) 996-4242. Providers update this record themselves, so call before visiting.
How can I verify Sarah E. Messmer, MD's license?
NPPES lists Illinois license number 036.145844, 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.
What is Sarah E. Messmer, MD's MIPS final score?
The 2023 MIPS final score is 87.1 of 100, reported for the practice group. 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.