SIMON JOHN WARREN (MD) – Dermatopathology (Pathology) Physician, NPI 1407828684
Dermatopathology (Pathology) Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
311 PATHOLOGY in IN
Provider Addresses for SIMON JOHN WARREN (MD)
635 Barnhill Dr # A128
Indianapolis, IN 462025126
Phone: (317) 274-4806
Type: Location
3621 S STATE ST
ANN ARBOR, MI 481081633
Phone: (734) 647-5299
Type: Mailing
1500 E MEDICAL CENTER DR
ANN ARBOR, MI 481095000
Phone: (734) 936-4000
Type: Location
Barnhill Drive, Indianapolis, Marion, Indiana, 46202-5816, United States
INDIANAPOLIS, IN 462025126
Phone: (317) 274-4806
Type: Mailing
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 $134.
Total Amount is formed as General ($134) + Research ($0) + Ownership ($0) = $134.
Last reported payment date: 2023-10-11 • Largest payer in this snapshot: Agilent Technologies, Inc. ($134).
Total Amount
$134
General + Research + Ownership
Payments
1
Total payment records
General Amount
$134
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-10-11
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Agilent Technologies, Inc. | $134 |
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: 2024-10-29
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20080429000206 | I | Pathology | IN | TBD |
| I20241029001131 | I | Pathology | MI | 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 |
|---|---|---|---|---|
| 88305 | Pathology examination of tissue using a microscope, intermediate complexity | 1,106 | 752 | $0 |
| 88341 | Special stained specimen slides to examine tissue, each additional procedure | 192 | 45 | $0 |
| 88342 | Special stained specimen slides to examine tissue, initial procedure | 83 | 73 | $0 |
| 88312 | Special stained specimen slides to identify organisms including interpretation and report | 54 | 36 | $0 |
| 88304 | Pathology examination of tissue using a microscope, moderately low complexity | 38 | 35 | $0 |
Insurance plans in this area (ZIP 46202)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| PATHOLOGY | IN | 88304 | Pathology examination of tissue using a microscope, moderately low complexity | 45 | 40 |
| PATHOLOGY | IN | 88312 | Special stained specimen slides to identify organisms including interpretation and report | 45 | 28 |
| PATHOLOGY | IN | 88342 | Tissue or cell analysis by immunologic technique | 85 | 76 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| G A S T R O E N T E R O L O G Y | FL | |
| Physical Medicine And Rehabilitation | MI | |
| A N E S T H E S I O L O G Y | MI | |
| Internal Medicine, Pediatric Medicine | IL | |
| - | MI | |
| Physician Assistant | MI |
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