Doctor profile · Federal record
Dr. John Clark
Hematology & Oncology Physician · Boston, MA
- NPI 1871550244
- 20 yrs on file
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
55 Fruit Street, Yaw 7B Mass General Hospital
Boston, MA 021142696
(617) 724-4000
fax (617) 643-1915 - Mailing address
-
Po Box 9142, Mass General Physicians Organization INC
Charlestown, MA 021299142
Credentials & registration
- NPI registered
- April 2006 — 20 yrs on file
- Profile last updated
- January 16, 2013
- Specialty taxonomy
- 207RH0003X — NUCC code
- State license (1)
- Massachusetts #49154
- Medicaid
- MA #6194613
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1871550244. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
45
Distinct HCPCS
3
Medicare allowed
$4,563
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 22 | 20 | $104 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 12 | 12 | $99 | |
99443 |
Telephone medical discussion with physician, 21-30 minutes | 11 | 11 | $99 |
In context: peer comparison
Among 64 peers in this city , average services per provider: 129. This provider delivers 0.3× the peer median.Open Payments
Industry payments received
All-time total
$19
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Abbott Laboratories | 1 | $18.72 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
21
Patients
0
Total drug cost
$501,810
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Lenvima (Lenvatinib Mesylate) | Brand | 21 | 0 | $501,810 |
Frequently asked questions
What is Dr. John Clark's medical specialty?
Dr. John Clark practices Hematology & Oncology Physician in Boston, MA.
Where does Dr. John Clark practice?
Dr. John Clark practices at 55 Fruit Street, Boston, MA 021142696. Office phone: 6177244000.
What is Dr. John Clark's NPI?
Dr. John Clark's National Provider Identifier (NPI) is 1871550244, issued by NPPES.
What procedures does Dr. John Clark 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 99214); Telephone medical discussion with physician (HCPCS 99443). Source: CMS Medicare Physician & Other Practitioners file.