Doctor profile · Federal record
Dr. Ammar Hassan, D.O.
Gastroenterology Physician (CMS: Gastroenterology) · Internal Medicine Physician · Internal Medicine Physician · Gastroenterology Physician · Munster, IN
- NPI 1023428877
- Accepts Medicare
- 12 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
9410 Calumet Ave Ste 401
Munster, IN 463210018
(219) 922-4900
fax (219) 836-9922 - Additional location
-
500 S Weber RD
Romeoville, IL 604466528
(815) 773-7732
Credentials & registration
- NPI registered
- May 2014 — 12 yrs on file
- Profile last updated
- December 15, 2025
- Year of graduation
- 2014 — 12 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State licenses (3)
- Indiana #2005989A · Indiana #02005989A · Illinois #036153911
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1023428877. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,634
Distinct HCPCS
10
Medicare allowed
$164,109
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 398 | 194 | $73 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 185 | 152 | $83 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 173 | 160 | $119 | |
99231 |
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 149 | 137 | $44 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 141 | 131 | $76 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 98 | 95 | $108 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 92 | 79 | $116 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 84 | 84 | $104 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 80 | 79 | $222 | |
43235 |
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 40 | 39 | $100 |
In context: peer comparison
Among 6 peers in this city , average services per provider: 77. This provider delivers 21× the peer median.Open Payments
Industry payments received
All-time total
$897
Transactions
45
Manufacturers
10
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| ABBVIE INC. | 12 | $179.70 | |
| Takeda Pharmaceuticals U.S.A., Inc. | 9 | $163.75 | |
| Olympus America Inc. | 3 | $148.05 | |
| Janssen Biotech, Inc. | 8 | $136.60 | |
| Ardelyx, Inc. | 4 | $100.06 | |
| Phathom Pharmaceuticals, Inc. | 4 | $72.49 | |
| Celgene Corporation | 2 | $36.05 | |
| Lilly USA, LLC | 1 | $22.37 | |
| Salix Pharmaceuticals, a division of Bausch Health US, LLC | 1 | $20.08 | |
| PFIZER INC. | 1 | $18.08 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
879
Patients
491
Total drug cost
$164,383
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 297 | 120 | $4,629 |
| Peg 3350-Electrolyte (Sodium Chloride/Nahco3/Kcl/Peg) | Brand | 125 | 123 | $2,516 |
| Gavilyte-G (Peg3350/Sod Sulf,bicarb,cl/Kcl) | Brand | 76 | 75 | $1,209 |
| Famotidine | Generic | 63 | 22 | $932 |
| Omeprazole | Generic | 58 | 23 | $585 |
| Clenpiq (Sod Picosulf/Mag Ox/Citric Ac) | Brand | 54 | 53 | $9,671 |
| Hydrocortisone | Generic | 35 | 30 | $677 |
| Dicyclomine Hcl | Generic | 32 | 17 | $697 |
| Sucralfate | Generic | 26 | 14 | $2,632 |
| Linzess (Linaclotide) | Brand | 22 | 0 | $20,798 |
Hospital affiliations
Frequently asked questions
What is Dr. Ammar Hassan's medical specialty?
Dr. Ammar Hassan practices Gastroenterology Physician in Munster, IN.
Where does Dr. Ammar Hassan practice?
Dr. Ammar Hassan practices at 9410 Calumet Ave Ste 401, Munster, IN 463210018. Office phone: 2199224900.
What is Dr. Ammar Hassan's NPI?
Dr. Ammar Hassan's National Provider Identifier (NPI) is 1023428877, issued by NPPES.
Does Dr. Ammar Hassan accept Medicare assignment?
Yes. Dr. Ammar Hassan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Ammar Hassan commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Established patient office or other outpatient visit (HCPCS 99213); Initial hospital care with straightforward or low-level medical decision making (HCPCS 99222). Source: CMS Medicare Physician & Other Practitioners file.