Quick answers
- Where does Douglas J. Harrison see patients?
- Medicare's clinician data lists 1 practice location in Rockland, DE. Call before your visit to confirm the address.
- What is Douglas J. Harrison's specialty?
- Medicare lists Hematology/Oncology as the primary specialty.
- Does Douglas J. Harrison accept Medicare assignment?
- Yes. Medicare's clinician data says Douglas J. Harrison accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is Douglas J. Harrison's NPI number?
- 1821293176. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Douglas J. Harrison is enrolled with Medicare (CMS data updated 2026-10-02).
- PO Box, Suite 191Rockland, DE 19732
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Delaware
Clinicians with the same Medicare primary specialty in Delaware — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Rutgers, Robert Woood Johnson Medical School |
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1821293176 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians