Internal Medicine, Gastroenterology · New York, NY
NPI
1649299686
Since 2006
Specialty
Internal Medicine, Gastroenterology
Code 207RG0100X
Group practices
1
Medicare group memberships
Hospitals
1
Hospital affiliations
5 East 98th Street, Mount Sinai Hospital Liver Diseases
New York, NY, 10029
Phone (212) 241-0034
Groups this clinician bills Medicare through
Medicare paid, 2024
$24K
370 services
Medicare patients, 2024
126
Average age 68
Drug cost, 2024
$913K
2,719 prescriptions
Company payments, 2025
$157
From 2 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by Charissa Y Chang was code 99213 (office e&m - established), 152 times for 75 patients. In total Charissa Y Chang billed 370 services in 19 codes, and Medicare paid $24K.
| Code |
|---|
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2019-09-27.
| Setting |
|---|
| Services |
|---|
| Patients |
|---|
| Paid per service |
|---|
| Medicare paid |
|---|
| 99213 Office E&M - Established | Office | 152 | 75 | $70.50 | $11K |
| 99232 Hospital E&M - Subsequent | Facility | 64 | 19 | $67.31 | $4,308 |
| 36415 Venipuncture Blood Collection | Office | 45 | 32 | $8.65 | $389 |
| 99212 Office E&M - Established | Office | 23 | 19 | $43.10 | $991 |
| 99214 Office E&M - Established | Office | 22 | 18 | $106.16 | $2,336 |
| 99441 Telephone Services | Office | 21 | 12 | $42.97 | $902 |
By year: 2022 $31K for 426 services; 2023 $27K for 388 services; 2024 $24K for 370 services.
Lab tests billed to Medicare, 2024
| Test code | Tests | Patients | Paid per test | Medicare paid |
|---|---|---|---|---|
| 36415 Venipuncture Blood Collection | 45 | 32 | $8.65 | $389 |
Medicare prescription drug claims, 2024
In 2024, the drug Charissa Y Chang prescribed most often to Medicare patients was Tacrolimus, with 515 prescriptions and refills. In total Charissa Y Chang wrote 2,719 Medicare prescriptions that cost $913K.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Tacrolimus Generic | 515 | 823 | 65 | $59K |
| Vemlidy Tenofovir Alafenamide | 260 | 302 | 37 | $418K |
| Ursodiol Generic | 210 | 335 | 46 | $21K |
| Entecavir Generic | 133 | 209 | 23 | $34K |
| Mycophenolate Mofetil Generic | 95 | 122 | 14 | $5,294 |
| Pantoprazole Sodium Generic | 93 | 155 | 20 | $990 |
| Amlodipine Besylate Generic | 90 | 149 | 16 | $552 |
| Omeprazole Generic | 74 | 114 | 16 | $548 |
| Prednisone Generic | 67 | 129 | 16 | $332 |
| Furosemide Generic | 66 | 82 | 16 | $160 |
| Carvedilol Generic | 63 | 85 | 12 | $220 |
| Lactulose Generic | 55 | 64 | 12 | $2,426 |
| Xifaxan Rifaximin | 52 | 53 | 11 | $141K |
| Prograf Tacrolimus | 49 | 76 | Under 11 | $27K |
| Gabapentin Generic | 46 | 65 | Under 11 | $476 |
Brand drugs: 507 claims; generic drugs: 2,178 claims; opioid claims: 11.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid Charissa Y Chang $157 ($157 in general payments such as food, travel and fees) from 2 companies. The largest payer was Madrigal Pharmaceuticals with $98.22.
Official US government data on Original Medicare services, Medicare prescription drug plans and the payments drug and device companies must report. Services with fewer than 11 patients and drugs with fewer than 11 claims are not published. Procedure codes are shown by number with their public category.