Doctor profile · Federal record
Dr. Margaret Callahan, MD
Medical Oncology Physician (CMS: Hematology/Oncology) · Medical Oncology Physician · Farmington, CT
- NPI 1508098534
- Accepts Medicare
- MIPS 79.4 / 100 · 2023
- 19 yrs in practice
- Licensed in 2 states
- Female
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
263 Farmington Ave
Farmington, CT 06030
(860) 679-2100 - Additional location
-
1275 York Ave
New York, NY 100656007
(800) 585-4118
Credentials & registration
- NPI registered
- August 2009 — 17 yrs on file
- Profile last updated
- January 16, 2024
- Year of graduation
- 2007 — 19 yrs since
- Specialty taxonomy
- 207RX0202X — NUCC code
- State licenses (2)
- Connecticut #075986 · New York #251318-1
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1508098534. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
254
Distinct HCPCS
3
Medicare allowed
$23,672
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 151 | 72 | $109 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 89 | 60 | $74 | |
99212 |
Established patient office or other outpatient visit, 10-19 minutes | 14 | 13 | $40 |
In context: peer comparison
Among 2 peers in this city , average services per provider: 78. This provider delivers 3.3× the peer median.Open Payments
Industry payments received
All-time total
$4,325
Transactions
2
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Regeneron Pharmaceuticals, Inc. | 1 | $3,275.00 | |
| AstraZeneca AB | 1 | $1,050.00 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
26
Patients
0
Total drug cost
$162,700
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Triamcinolone Acetonide | Generic | 15 | 0 | $305 |
| Mekinist (Trametinib Dimethyl Sulfoxide) | Brand | 11 | 0 | $162,395 |
Frequently asked questions
What is Dr. Margaret Callahan's medical specialty?
Dr. Margaret Callahan practices Medical Oncology Physician in Farmington, CT.
Where does Dr. Margaret Callahan practice?
Dr. Margaret Callahan practices at 263 Farmington Ave, Farmington, CT 06030. Office phone: 8606792100.
What is Dr. Margaret Callahan's NPI?
Dr. Margaret Callahan's National Provider Identifier (NPI) is 1508098534, issued by NPPES.
Does Dr. Margaret Callahan accept Medicare assignment?
Yes. Dr. Margaret Callahan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Margaret Callahan commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99213); Established patient office or other outpatient visit (HCPCS 99212). Source: CMS Medicare Physician & Other Practitioners file.