MARK D DIAMOND (D.O.) – Hospitalist Physician, NPI 1265402804
Hospitalist Physician
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Profile Insights
NPPES metrics only — not quality of care.
8,824 INTERNAL MEDICINE in IL
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Provider Addresses for MARK D DIAMOND (D.O.)
1860 PAYSHERE CIRCLE
CHICAGO, IL 60674
Phone: (630) 469-9200
Type: Mailing
2320, High Street, Blue Island, Calumet Township, Cook County, Illinois, 60406, United States
BLUE ISLAND, IL 604062426
Phone: (815) 215-2121
Fax: (815) 741-5518
Type: Location
PO BOX 713260
CHICAGO, IL 606771260
Phone: (630) 469-9200
Type: Mailing
2100 GLENWOOD AVE
JOLIET, IL 604355487
Phone: (815) 725-2121
Fax: (815) 744-3117
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 30 Open Payments records for all available years, with a total value of $373.
Total Amount is formed as General ($373) + Research ($0) + Ownership ($0) = $373.
Last reported payment date: 2024-12-03 • Largest payer in this snapshot: Novartis Pharmaceuticals Corporation ($373).
Total Amount
$373
General + Research + Ownership
Payments
30
Total payment records
General Amount
$373
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-03
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Novartis Pharmaceuticals Corporation | $373 |
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: 2007-07-28
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 |
|---|---|---|---|---|
| I20070728000051 | 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 |
|---|---|---|---|---|
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 554 | 213 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 232 | 206 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 231 | 206 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 185 | 108 | $0 |
| 99291 | Critical care, first 30-74 minutes | 14 | 14 | $0 |
Insurance plans in this area (ZIP 60674)
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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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