Jackson T. Knappen, MD
Hospitalist Physician · Chicago, IL
Jackson T. Knappen, MD is a hospitalist physician with a practice address in Chicago, Illinois, and NPI 1811639081, issued on Apr 8, 2022. Check the license (Illinois 036171856, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Jackson T. Knappen
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License numbers
- 036171856 IL
125081050 IL
Self-reported in NPPES; status is on the state search - Practice location
- 820 S Wood St Ste 100, Chicago, IL 60612
- Phone
- (312) 996-2933
- Enumerated
- Apr 8, 2022
- Record last updated
- Jul 8, 2025
- Medicare enrollment
- Enrolled (PECOS I20250717002837); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 1,535 in Illinois → Look up another NPI →
Also registered at 820 S Wood St Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jackson T. Knappen 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 036171856Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
69% fewer Medicare Part D claims than the average hospitalist physician in 2024
163 Medicare Part D claims for 35 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium30 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.
Bills Medicare through one group practice
- Northwestern Medical Faculty FoundationChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jackson T. Knappen among 1,535 hospitalist physician records in Illinois
Jackson T. Knappen, MD is one of 1,535 hospitalist physician records with a practice address in Illinois. 92% 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 93% of them.
- NPI issued2022 · 93% of these records are older, 2% newer
- In a Medicare fileYes · 92% of these records are
- In the CMS Doctors and Clinicians fileYes · 87% of these records are
- Graduated2022 · median 2013 among the 1,339 with a school on file
- Record last updated2025 · 32% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in Illinois
There are 1,535 hospitalist physician records in Illinois.
All 1,535 in Illinois → Every provider in Chicago → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Catherine Dimou, M.D.Chicago, IL 606121073615076
- Ann Goh, M.D.Chicago, IL 606121013019728
- Dorian Guerra, M.D.Chicago, IL 606121053590430
- Scott Hasler, M.D.Chicago, IL 606121619079282
- Syed Hassan, M.D.Chicago, IL 606121902014962
- Richard Huh, M.D.Chicago, IL 606121487742409
- Jisu Kim, M.D.Chicago, IL 606121275645871
- Rudolf Kumapley, MBCHBChicago, IL 606121932138922
Common questions
What is Jackson T. Knappen, MD's NPI number?
Jackson T. Knappen, MD's National Provider Identifier (NPI) is 1811639081, issued on Apr 8, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Jackson T. Knappen, MD located?
The NPPES record lists a practice address at 820 S Wood St Ste 100, Chicago, IL, 60612. Phone: (312) 996-2933. Providers update this record themselves, so call before visiting.
How can I verify Jackson T. Knappen, MD's license?
NPPES lists Illinois license number 036171856, 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 Jackson T. Knappen, MD prescribe under Medicare Part D?
In 2024, Jackson T. Knappen, MD had 163 Medicare Part D claims for 35 beneficiaries; the average among hospitalist physician prescribers was 521. 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.