DR. APARNA NATARAJAN (MD) – Internal Medicine Physician, NPI 1417264144
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
629 NEPHROLOGY in IL
Provider Addresses for DR. APARNA NATARAJAN (MD)
205 S LINDEN AVE
WESTMONT, IL 605592012
Phone: (312) 342-2432
Type: Mailing
901 MCCLINTOCK DR
STE 202
BURR RIDGE, IL 605270871
Phone: (630) 655-6748
Fax: (630) 734-4715
Type: Location
2222 W Division St Ste 210
Chicago, IL 606223094
Phone: (773) 484-4330
Type: Location
2222 W DIVISION ST STE 210
CHICAGO, IL 606223094
Phone: (773) 484-4330
Type: Location
1725 W HARRISON ST STE 762
CHICAGO, IL 606123852
Phone: (312) 563-1230
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 46 Open Payments records for all available years, with a total value of $2,582.
Total Amount is formed as General ($2,582) + Research ($0) + Ownership ($0) = $2,582.
Last reported payment date: 2024-12-11 • Largest payer in this snapshot: Bayer Healthcare Pharmaceuticals Inc. ($1,602).
Total Amount
$2,582
General + Research + Ownership
Payments
46
Total payment records
General Amount
$2,582
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-11
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2013-10-14
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Past revalidation due date
Earliest CMS due date was 2023-10-31 (956 days ago).
Enrollment records
1
Earliest due date
2023-10-31
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 |
|---|---|---|---|---|
| I20131014000441 | I | Nephrology | IL | 2023-10-31 |
What to do next
- Verify current status on the CMS Revalidation Lookup Tool immediately.
- Complete revalidation in PECOS or contact your Medicare Administrative Contractor (MAC).
- Overdue revalidation can lead to deactivation of Medicare billing privileges.
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 |
|---|---|---|---|---|
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 225 | 55 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 104 | 50 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 60 | 47 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 31 | 17 | $0 |
| 99212 | Established patient office or other outpatient visit, 10-19 minutes | 27 | 19 | $0 |
Insurance plans in this area (ZIP 60559)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Nephrology, Internal Medicine | IL | |
| N E P H R O L O G Y | IL |
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