Keith So, M.D.
Internal Medicine Physician · Chicago, IL
Keith So, M.D. is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1437218682, issued on Dec 6, 2006. Check the license (Illinois 036-102425, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Keith So
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036-102425 IL
Self-reported in NPPES; status is on the state search - Practice location
- 3860 W Ogden Ave, Chicago, IL 60623
- Phone
- (872) 588-3000
- Enumerated
- Dec 6, 2006
- Record last updated
- Feb 16, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (872) 588-3001
- Medicaid ID
- 036102425 IL
- Medicare enrollment
- Enrolled (PECOS I20070206000294); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 3860 W Ogden Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jeneson Abraham, P.A.Medical Physician Assistant1013975218
- Luisa AdameCounselor1255968160
- Grace Ahn, DDSDentist1518166743
- Similolu Akintorin, MDFamily Medicine Physician1033790407
- Edward Akinyemi, MDFamily Medicine Physician1609525104
- Lars Armainsson, MDInternal Medicine Physician1336259514
Verify Keith So 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 036-102425Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
39% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,947 Medicare Part D claims for 168 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims. 11 claims were for opioids.
Most prescribed
- Atorvastatin Calcium132 claims
- Hydrochlorothiazide106 claims
- Metformin Hcl99 claims
- Amlodipine Besylate75 claims
- Lisinopril48 claims
- Losartan Potassium46 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
- Lawndale Christian Health CenterChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Keith So among 7,238 internal medicine physician records in Illinois
Keith So, 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 updated2016 · 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
- Lars Armainsson, MDChicago, IL 606231336259514
- Ravikiran Barigala, M.D.Chicago, IL 606231801805437
- Tyla CourtneyChicago, IL 606231841329489
- Chukwudozie Ezeokoli, MDChicago, IL 606231881838159
- Ryan Fabrizius, M.D.Chicago, IL 606231851683122
- Christopher Flinn, M.D.Chicago, IL 606231063668341
- Janice Huber, M.D.Chicago, IL 606231649474404
- Catherine Lin, M.D.Chicago, IL 606231659532877
Common questions
What is Keith So, M.D.'s NPI number?
Keith So, M.D.'s National Provider Identifier (NPI) is 1437218682, issued on Dec 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Keith So, M.D. located?
The NPPES record lists a practice address at 3860 W Ogden Ave, Chicago, IL, 60623. Phone: (872) 588-3000. Providers update this record themselves, so call before visiting.
How can I verify Keith So, M.D.'s license?
NPPES lists Illinois license number 036-102425, 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 Keith So, M.D. prescribe under Medicare Part D?
In 2024, Keith So, M.D. had 1,947 Medicare Part D claims for 168 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.