Kellyn Marks, M.D.
Internal Medicine Physician · Chicago, IL
Kellyn Marks, M.D. is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1215973599, issued on Jun 22, 2006. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Kellyn Marks
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 201 E Huron St, Chicago, IL 60611
- Phone
- (312) 926-5111
- Enumerated
- Jun 22, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20101012001317); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 201 E Huron St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kevin Andrus, DDSOral and Maxillofacial Surgery (Dentist)1689797243
- Catherine Angle, APHPediatric Nurse Practitioner1578752812
- Mitesh Badiwala, M.D.Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician1316280035
- Sheila Barton, RNRegistered Nurse1548447527
- Helen Bedross, RNRegistered Nurse1700063799
- Senta Berggruen, MDDiagnostic Radiology Physician1891749776
Verify Kellyn Marks 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
43% more Medicare Part D claims than the average internal medicine physician in 2024
4,551 Medicare Part D claims for 433 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 20 claims were for opioids.
Most prescribed
- Atorvastatin Calcium721 claims
- Amlodipine Besylate339 claims
- Losartan Potassium323 claims
- Rosuvastatin Calcium231 claims
- Levothyroxine Sodium197 claims
- Alendronate Sodium120 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): 94.1 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).
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).
Kellyn Marks among 7,238 internal medicine physician records in Illinois
Kellyn Marks, 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated1993 · median 2003 among the 3,580 with a school on file
- 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).
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
- Kenneth Arbetter, MDChicago, IL 606111336132851
- Steven Gallo, MDChicago, IL 606111548253024
- Arnold Grauer, MDChicago, IL 606111619960184
- James Hall, MDChicago, IL 606111649263153
- Frances Langdon, MDChicago, IL 606111063405546
- Michael Lee, MDChicago, IL 606111942293451
- Hazel Manzano, MDChicago, IL 606111801889316
- Chadwick Milstead, MDChicago, IL 606111740273259
Common questions
What is Kellyn Marks, M.D.'s NPI number?
Kellyn Marks, M.D.'s National Provider Identifier (NPI) is 1215973599, issued on Jun 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Kellyn Marks, M.D. located?
The NPPES record lists a practice address at 201 E Huron St, Chicago, IL, 60611. Phone: (312) 926-5111. Providers update this record themselves, so call before visiting.
How can I verify Kellyn Marks, 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 Kellyn Marks, M.D. prescribe under Medicare Part D?
In 2024, Kellyn Marks, M.D. had 4,551 Medicare Part D claims for 433 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Kellyn Marks, M.D.'s MIPS final score?
The 2023 MIPS final score is 94.1 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.