Internal Medicine, Hematology & Oncology · New York, NY
NPI
1134175318
Since 2006
Specialty
Internal Medicine, Hematology & Oncology
Code 207RH0003X
Group practices
2
Medicare group memberships
Hospitals
0
Hospital affiliations
425 W 59th St Fl 9
New York, NY, 10019
Phone (212) 523-5559
Groups this clinician bills Medicare through
Medicare paid, 2024
$17K
216 services
Medicare patients, 2024
78
Average age 71
Drug cost, 2024
$1.9M
770 prescriptions
Company payments, 2025
$21.62
From 1 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by Gustavo L Fernandez-Castro was code 99214 (office e&m - established), 177 times for 57 patients. In total Gustavo L Fernandez-Castro billed 216 services in 8 codes, and Medicare paid $17K.
| Code |
|---|
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2026-07-23.
| Setting |
|---|
| Services |
|---|
| Patients |
|---|
| Paid per service |
|---|
| Medicare paid |
|---|
| 99214 Office E&M - Established | Office | 177 | 57 | $75.63 | $13K |
| 99213 Office E&M - Established | Office | 17 | 16 | $44.94 | $764 |
By year: 2022 $19K for 237 services; 2023 $14K for 164 services; 2024 $17K for 216 services.
Medicare prescription drug claims, 2024
In 2024, the drug Gustavo L Fernandez-Castro prescribed most often to Medicare patients was Ondansetron Hcl, with 83 prescriptions and refills. In total Gustavo L Fernandez-Castro wrote 770 Medicare prescriptions that cost $1.9M.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Ondansetron Hcl Generic | 83 | 83 | 49 | $1,052 |
| Levothyroxine Sodium Generic | 61 | 119 | 16 | $393 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 50 | 50 | 20 | $1,483 |
| Megestrol Acetate Generic | 40 | 47 | 12 | $1,764 |
| Dexamethasone Generic | 38 | 42 | 18 | $263 |
| Eliquis Apixaban | 36 | 51 | 11 | $30K |
| Hydrocortisone Generic | 33 | 33 | Under 11 | $351 |
| Lonsurf Trifluridine/Tipiracil Hcl | 27 | 27 | Under 11 | $214K |
| Gabapentin Generic | 27 | 31 | 16 | $324 |
| Creon Lipase/Protease/Amylase | 22 | 24 | Under 11 | $59K |
| Pantoprazole Sodium Generic | 22 | 47 | Under 11 | $112 |
| Doxycycline Hyclate Generic | 19 | 25 | Under 11 | $990 |
| Fentanyl Generic | 16 | 16 | Under 11 | $1,492 |
| Fruzaqla Fruquintinib | 14 | 14 | Under 11 | $343K |
| Lidocaine-Prilocaine Lidocaine/Prilocaine | 13 | 15 | Under 11 | $321 |
Brand drugs: - claims; generic drugs: 584 claims; opioid claims: 87.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid Gustavo L Fernandez-Castro $21.62 ($21.62 in general payments such as food, travel and fees) from 1 company. The largest payer was E.R. Squibb & Sons, L.L.C. with $21.62.
| Company | Payments | Amount |
|---|---|---|
| E.R. Squibb & Sons, L.L.C. BMY | 1 | $21.62 |
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.