Isoken Koko, MD
NPI 1265465728 · Hematology & Oncology Physician · River Forest, IL
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Isoken Koko, MD is a Hematology & Oncology Physician provider in River Forest, IL (NPI 1265465728).
Provider details
- NPI number
- 1265465728
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 036100278 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
618 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 244 | $132 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 162 | $92 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 100 | $122 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 53 | $178 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 33 | $169 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 37 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 117 | 38 |
| Apixabanbrand: Eliquis | 113 | 24 |
| Letrozole | 75 | 22 |
| Lenalidomidebrand: Revlimid | 61 | 13 |
| Tamoxifen Citrate | 50 | 16 |
| Hydroxyurea | 45 | — |
| Valacyclovir Hclbrand: Valacyclovir | 44 | 14 |
| Exemestane |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,169 across 81 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-08
- Last updated
- 2017-01-23
Frequently asked questions
- What is Isoken Koko's NPI number?
- Isoken Koko's National Provider Identifier (NPI) is 1265465728, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Isoken Koko's specialty?
- Isoken Koko is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Isoken Koko located?
- Isoken Koko's practice location on file with NPPES is 7420 W Central, River Forest, IL 60305-1800.
- What is Isoken Koko's phone number?
- The practice phone number listed in the NPPES registry for Isoken Koko is (708) 763-2700.
- Does Isoken Koko accept Medicare?
- Isoken Koko is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Isoken Koko's NPI active?
- Yes — Isoken Koko's NPI (1265465728) is active in the NPPES registry as of the last update on 2017-01-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.