DR. MARK K ISONIEMI (M.D.) – Family Medicine Physician, NPI 1295779239
Family Medicine Physician
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Profile Insights
NPPES metrics only — not quality of care.
5,037 FAMILY PRACTICE in IL
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Provider Addresses for DR. MARK K ISONIEMI (M.D.)
1860 PAYSPHERE CIR
CHICAGO, IL 606740018
Phone:
Type: Mailing
1800, North Main Street, Wheaton, DuPage County, Illinois, 60187, United States
WHEATON, IL 601873112
Phone: (630) 665-6200
Type: Location
PO BOX 713260
CHICAGO, IL 606771260
Phone: (630) 469-9200
Type: Mailing
150 E WILLOW AVE
WHEATON, IL 601875476
Phone: (630) 510-6900
Fax: (630) 871-6706
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 24 Open Payments records for all available years, with a total value of $448.
Total Amount is formed as General ($448) + Research ($0) + Ownership ($0) = $448.
Last reported payment date: 2024-10-09 • Largest payer in this snapshot: PFIZER INC. ($132).
Total Amount
$448
General + Research + Ownership
Payments
24
Total payment records
General Amount
$448
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-10-09
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| PFIZER INC. | $132 |
| Novo Nordisk Inc | $92 |
| Exact Sciences Corporation | $68 |
| Lilly USA, LLC | $51 |
| Amgen Inc. | $48 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2007-08-22
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20070822000334 | I | Family Practice | IL | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 36415 | Insertion of needle into vein for collection of blood sample | 245 | 183 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 167 | 119 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 167 | 111 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 165 | 165 | $0 |
| 80053 | Blood test, comprehensive group of blood chemicals | 124 | 116 | $0 |
Insurance plans in this area (ZIP 60674)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| FAMILY MEDICINE | IL | 90670 | Pneumococcal vaccine for injection into muscle | 36 | 36 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| E N D O C R I N O L O G Y | IL | |
| Physician Assistant | IL | |
| Internal Medicine | IL | |
| Nurse Practitioner | IL | |
| - | IL | |
| - | IL | |
| - | IL | |
| - | IL | |
| - | IL | |
| Physical Therapist In Private Practice | IL |
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