Doctor profile · Federal record
Dr. Seng Leong, MD
Internal Medicine Physician (CMS: Internal Medicine) · Barrington, IL
- NPI 1487750790
- Accepts Medicare
- 57 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
27750 W Highway 22
Barrington, IL 600102379
(847) 381-5800
fax (847) 381-5873 - Mailing address
-
29373 Network Pl
Chicago, IL 606731293
Credentials & registration
- NPI registered
- September 2006 — 20 yrs on file
- Profile last updated
- March 31, 2025
- Year of graduation
- 1969 — 57 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Illinois #036-055809
- Medicaid
- IL #03655809
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1487750790. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
3,159
Distinct HCPCS
10
Medicare allowed
$276,144
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 1,057 | 527 | $132 | |
36415 |
Insertion of needle into vein for collection of blood sample | 906 | 510 | $8 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 229 | 229 | $133 | |
G0008 |
Administration of influenza virus vaccine | 160 | 155 | $32 | |
90662 |
Influenza vaccine split virus, preservative free | 155 | 150 | $72 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 143 | 125 | $184 | |
G0438 |
Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit | 112 | 112 | $169 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 93 | 79 | $93 | |
G0009 |
Administration of pneumococcal vaccine | 78 | 78 | $32 | |
93000 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | 70 | 68 | $15 |
In context: peer comparison
Among 7 peers in Barrington Internal Medicine Physician, average services per provider: 149. This provider delivers 21× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
6,593
Patients
1,884
Total drug cost
$84,133
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 1,076 | 299 | $13,842 |
| Amlodipine Besylate | Generic | 910 | 259 | $8,602 |
| Levothyroxine Sodium | Generic | 515 | 145 | $7,822 |
| Losartan Potassium | Generic | 511 | 150 | $7,486 |
| Metoprolol Succinate | Generic | 449 | 134 | $9,180 |
| Lisinopril | Generic | 413 | 113 | $4,205 |
| Omeprazole | Generic | 383 | 125 | $5,697 |
| Hydrochlorothiazide | Generic | 369 | 117 | $3,010 |
| Metoprolol Tartrate | Generic | 343 | 89 | $3,904 |
| Gabapentin | Generic | 298 | 77 | $4,955 |
Hospital affiliations
Frequently asked questions
What is Dr. Seng Leong's medical specialty?
Dr. Seng Leong practices Internal Medicine Physician in Barrington, IL.
Where does Dr. Seng Leong practice?
Dr. Seng Leong practices at 27750 W Highway 22, Barrington, IL 600102379. Office phone: 8473815800.
What is Dr. Seng Leong's NPI?
Dr. Seng Leong's National Provider Identifier (NPI) is 1487750790, issued by NPPES.
Does Dr. Seng Leong accept Medicare assignment?
Yes. Dr. Seng Leong accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Seng Leong commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Insertion of needle into vein for collection of blood sample (HCPCS 36415); Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (HCPCS G0439). Source: CMS Medicare Physician & Other Practitioners file.