Doctor profile · Federal record

Dr. James O'Leary, M.D.

Medical Oncology Physician · Waltham, MA

  • NPI 1336371012
  • 17 yrs on file
  • Male
  • Solo practice
  • No sanctions

Practice & contact

NPPES Updated May 11, 2026
Primary practice
830 Winter St
Waltham, MA 024511477
(781) 895-0600
fax (781) 895-0611

Credentials & registration

NPPES · NUCC
NPI registered
August 2009 — 17 yrs on file
Specialty taxonomy
207RX0202X — NUCC code
State license (1)
New York #188142

Federal sanctions & exclusions

OIG LEIE Updated May 11, 2026

No sanctions, exclusions or revocations on file

Checked against OIG LEIE on NPI 1336371012. Last verified May 11, 2026.

Open Payments

Industry payments received

CMS Open Payments
All-time total
$10,750
Transactions
2
Manufacturers
1
Payer (manufacturer) Industry Txns Amount
Takeda Pharmaceuticals U.S.A., INC. 2 $10,750.00

By nature of payment

Consulting Fee
$10,750

Frequently asked questions

Auto-generated from federal data
What is Dr. James O'Leary's medical specialty?
Dr. James O'Leary practices Medical Oncology Physician in Waltham, MA.
Where does Dr. James O'Leary practice?
Dr. James O'Leary practices at 830 Winter St, Waltham, MA 024511477. Office phone: 7818950600.
What is Dr. James O'Leary's NPI?
Dr. James O'Leary's National Provider Identifier (NPI) is 1336371012, issued by NPPES.