Doctor profile · Federal record
Dr. Robert Jen, M.D.
Internal Medicine Physician (CMS: Internal Medicine) · Oak Lawn, IL
- NPI 1104169994
- Accepts Medicare
- 13 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
4440 W 95Th St
Oak Lawn, IL 604532600
(708) 684-8000 - Mailing address
-
29373 Network Pl
Chicago, IL 606731293
Credentials & registration
- NPI registered
- April 2013 — 13 yrs on file
- Profile last updated
- October 6, 2025
- Year of graduation
- 2013 — 13 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Illinois #125.063485
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1104169994. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
756
Distinct HCPCS
4
Medicare allowed
$95,793
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 558 | 156 | $124 | |
99239 |
Hospital discharge day management, more than 30 minutes | 89 | 89 | $119 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 71 | 71 | $179 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 38 | 27 | $81 |
In context: peer comparison
Among 29 peers in this city , average services per provider: 146. This provider delivers 5.2× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
11
Patients
11
Total drug cost
$56
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 11 | 11 | $56 |
Hospital affiliations
Frequently asked questions
What is Dr. Robert Jen's medical specialty?
Dr. Robert Jen practices Internal Medicine Physician in Oak Lawn, IL.
Where does Dr. Robert Jen practice?
Dr. Robert Jen practices at 4440 W 95Th St, Oak Lawn, IL 604532600. Office phone: 7086848000.
What is Dr. Robert Jen's NPI?
Dr. Robert Jen's National Provider Identifier (NPI) is 1104169994, issued by NPPES.
Does Dr. Robert Jen accept Medicare assignment?
Yes. Dr. Robert Jen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Robert Jen 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.