Doctor profile · Federal record
Dr. Mark Diamond, D.O.
Hospitalist Physician (CMS: Internal Medicine) · Internal Medicine Physician · Joliet, IL
- NPI 1265402804
- Accepts Medicare
- 33 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
2100 Glenwood Ave
Joliet, IL 604355487
(815) 725-2121
fax (815) 744-3117 - Mailing address
-
Po Box 713260
Chicago, IL 606771260
Credentials & registration
- NPI registered
- January 2006 — 20 yrs on file
- Profile last updated
- August 7, 2023
- Year of graduation
- 1993 — 33 yrs since
- Specialty taxonomy
- 208M00000X — NUCC code
- State license (1)
- Illinois #036091440
- Medicaid
- IL #036091440
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1265402804. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,216
Distinct HCPCS
5
Medicare allowed
$157,621
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 554 | 213 | $125 | |
99239 |
Hospital discharge day management, more than 30 minutes | 232 | 206 | $120 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 231 | 206 | $182 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 185 | 108 | $83 | |
99291 |
Critical care, first 30-74 minutes | 14 | 14 | $227 |
In context: peer comparison
Among 6 peers in this city , average services per provider: 229. This provider delivers 5.3× the peer median.Open Payments
Industry payments received
All-time total
$191
Transactions
13
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Novartis Pharmaceuticals Corporation | 13 | $190.69 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
91
Patients
86
Total drug cost
$526
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 25 | 23 | $164 |
| Prednisone | Generic | 24 | 21 | $53 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 15 | 15 | $82 |
| Cephalexin | Generic | 14 | 14 | $80 |
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 13 | 13 | $146 |
Hospital affiliations
Frequently asked questions
What is Dr. Mark Diamond's medical specialty?
Dr. Mark Diamond practices Hospitalist Physician in Joliet, IL.
Where does Dr. Mark Diamond practice?
Dr. Mark Diamond practices at 2100 Glenwood Ave, Joliet, IL 604355487. Office phone: 8157252121.
What is Dr. Mark Diamond's NPI?
Dr. Mark Diamond's National Provider Identifier (NPI) is 1265402804, issued by NPPES.
Does Dr. Mark Diamond accept Medicare assignment?
Yes. Dr. Mark Diamond accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Diamond commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Hospital discharge day management (HCPCS 99239); Initial hospital care with moderate level of medical decision making (HCPCS 99223). Source: CMS Medicare Physician & Other Practitioners file.