DR. CHONG H. AHN (MD) – Internal Medicine Physician, NPI 1871585216
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
8,824 INTERNAL MEDICINE in IL
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Provider Addresses for DR. CHONG H. AHN (MD)
104, North Arlington Heights Road, Scarsdale, Arlington Heights, Wheeling Township, Cook County, Illinois, 60004, United States
ARLINGTON HEIGHTS, IL 60004
Phone: (847) 253-5985
Fax: (847) 253-0336
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 1 Open Payments records for all available years, with a total value of $22.
Total Amount is formed as General ($22) + Research ($0) + Ownership ($0) = $22.
Last reported payment date: 2024-07-23 • Largest payer in this snapshot: PFIZER INC. ($22).
Total Amount
$22
General + Research + Ownership
Payments
1
Total payment records
General Amount
$22
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-07-23
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| PFIZER INC. | $22 |
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: 2010-07-02
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 |
|---|---|---|---|---|
| I20100702000436 | I | Internal Medicine | 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 |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 292 | 81 | $0 |
| 93000 | Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | 106 | 53 | $0 |
| 99443 | Telephone medical discussion with physician, 21-30 minutes | 55 | 21 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 24 | 24 | $0 |
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 21 | 18 | $0 |
Insurance plans in this area (ZIP 60004)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| INTERNAL MEDICINE | IL | 85610 | Blood test, clotting time | 51 | 15 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | IL | |
| Cardiovascular Disease (Cardiology), Internal Medicine | IN | |
| - | IL | |
| Nurse Practitioner | IL | |
| Nurse Practitioner | IL | |
| Physician Assistant | IL | |
| Nurse Practitioner | MI | |
| Internal Medicine | IL | |
| Internal Medicine, Cardiovascular Disease (Cardiology) | IL | |
| Family Practice | IL |
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