John Karesh, MD
NPI 1932127917 · Internal Medicine Physician · Oswego, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Karesh, MD is a Internal Medicine Physician provider in Oswego, IL (NPI 1932127917).
Provider details
- NPI number
- 1932127917
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036-057128 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
4,038 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Blood Test, Clotting Time85610 | 692 | $4 |
| Anticoagulant Management of Patient Taking Warfarin93793 | 664 | $11 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 619 | $9 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 429 | $86 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 395 | $122 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'S |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 146 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 600 | 170 |
| Lisinopril | 428 | 122 |
| Levothyroxine Sodium | 417 | 81 |
| Amlodipine Besylate | 406 | 105 |
| Losartan Potassium | 388 | 104 |
| Metformin Hcl | 318 | 90 |
| Gabapentin |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-17
- Last updated
- 2021-11-18
- Certified
- 2021-11-18
Frequently asked questions
- What is John Karesh's NPI number?
- John Karesh's National Provider Identifier (NPI) is 1932127917, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Karesh's specialty?
- John Karesh is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Karesh located?
- John Karesh's practice location on file with NPPES is 80 Templeton Dr, Oswego, IL 60543-7000.
- What is John Karesh's phone number?
- The practice phone number listed in the NPPES registry for John Karesh is (630) 554-3456.
- Does John Karesh accept Medicare?
- John Karesh is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Karesh's NPI active?
- Yes — John Karesh's NPI (1932127917) is active in the NPPES registry as of the last update on 2021-11-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.