IndividualActive
Karen Marcus, MD
NPI 1609827666 · Radiation Oncology Physician · Boston, MA
Karen Marcus, MD is a Radiation Oncology Physician provider in Boston, MA (NPI 1609827666).
Provider details
- NPI number
- 1609827666
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 70801 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
300 Longwood Avenue
Childrens Hospital Dept of Radiation Oncology
Boston, MA 02115
Phone: (617) 355-8399
Street-level locationGet directions
Mailing address
300 Longwood Avenue
Boston, MA 02115
Registry dates
- Enumerated
- 2006-05-15
- Last updated
- 2007-08-13
Frequently asked questions
- What is Karen Marcus's NPI number?
- Karen Marcus's National Provider Identifier (NPI) is 1609827666, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Marcus's specialty?
- Karen Marcus is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Marcus located?
- Karen Marcus's practice location on file with NPPES is 300 Longwood Avenue, Boston, MA 02115.
- What is Karen Marcus's phone number?
- The practice phone number listed in the NPPES registry for Karen Marcus is (617) 355-8399.
- Is Karen Marcus's NPI active?
- Yes — Karen Marcus's NPI (1609827666) is active in the NPPES registry as of the last update on 2007-08-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.