Isoken Koko, MD
Hematology & Oncology Physician · River Forest, IL
Isoken Koko, MD is a hematology & oncology physician with a practice address in River Forest, Illinois, and NPI 1265465728, issued on Jul 8, 2006. Check the license (Illinois 036100278, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Isoken Koko
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 036100278 IL
Self-reported in NPPES; status is on the state search - Practice location
- 7420 W Central, River Forest, IL 60305
- Phone
- (708) 763-2700
- Enumerated
- Jul 8, 2006
- Record last updated
- Jan 23, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (708) 488-9660
- Medicare enrollment
- Enrolled (PECOS I20041104000725); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 666 in Illinois → Look up another NPI →
Verify Isoken Koko 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 036100278Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
45% more Medicare Part D claims than the average hematology & oncology physician in 2024
1,274 Medicare Part D claims for 217 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 37% of claims. 90 claims were for opioids.
Most prescribed
- Anastrozole117 claims
- Eliquis113 claims
- Letrozole75 claims
- Revlimid61 claims
- Tamoxifen Citrate50 claims
- Hydroxyurea45 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.
Industry payments in 2024: $2,169.25
81 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 8,560 providers of this specialty with any payment received $7,481.41 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
- Resilience Healthcare - Lakefront Medical Associates LLCOak Park, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Isoken Koko among 666 hematology & oncology physician records in Illinois
Isoken Koko, MD is one of 666 hematology & oncology physician records with a practice address in Illinois. 84% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 57% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1984 · median 2003 among the 461 with a school on file
- Record last updated2017 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Illinois
There are 666 hematology & oncology physician records in Illinois.
All 666 in Illinois → Every provider in River Forest → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- John Berry, MDBerwyn, IL 604021194702795
- Lawrence Schilder, DOBerwyn, IL 604021962439398
- Elyse Lambiase, MDEvanston, IL 602021912992561
- Kj Philip, MDEvanston, IL 602021598776494
- Dhruv Bansal, MDEvanston, IL 602011023296209
- Robert Eisner, D.O.Evanston, IL 602011841372299
- Melissa Gunchenko, MDEvanston, IL 602011457040537
- Amy Wang, MDEvanston, IL 602011497160584
Common questions
What is Isoken Koko, MD's NPI number?
Isoken Koko, MD's National Provider Identifier (NPI) is 1265465728, issued on Jul 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Isoken Koko, MD located?
The NPPES record lists a practice address at 7420 W Central, River Forest, IL, 60305. Phone: (708) 763-2700. Providers update this record themselves, so call before visiting.
How can I verify Isoken Koko, MD's license?
NPPES lists Illinois license number 036100278, 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 Isoken Koko, MD prescribe under Medicare Part D?
In 2024, Isoken Koko, MD had 1,274 Medicare Part D claims for 217 beneficiaries; the average among hematology & oncology physician prescribers was 877. 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.