Active NPI
Katharine Pfeiffer, STUDENT
- Registered Nurse
- Boston, MA
National Provider Identifier
1801666375
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Registered Nurse
- License
- RN2330619
- Practice address
- 800 Washington St
Boston, MA 02111-1552 - Phone
- (617) 636-5000
- NPI assigned
- Jan 5, 2024
- Sex
- Female
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Registered Nurse | 163W00000X | RN2330619 | MA | Primary |
Addresses
Primary practice location
800 Washington St
Boston, MA 02111-1552
Mailing address
140 Commonwealth Ave
Chestnut Hill, MA 02467-3800
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
Care Compare profile
Medicare Care Compare- Specialty
- Certified Registered Nurse Anesthetist (Crna)
- Education
- Other, 2026
- Medicare assignment
- May accept Medicare assignment
Practice addresses (Care Compare)
800 Washington St
Boston, MA 02111-1552
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| RN2330619 | MA | MD | Registered Nurse |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1704412800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1780531200000",
"number": "1801666375",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "140 COMMONWEALTH AVE",
"city": "CHESTNUT HILL",
"state": "MA",
"postal_code": "024673800"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "800 WASHINGTON ST",
"city": "BOSTON",
"state": "MA",
"postal_code": "021111552",
"telephone_number": "617-636-5000"
}
],
"practiceLocations": [],
"basic": {
"last_name": "PFEIFFER",
"first_name": "KATHARINE",
"credential": "STUDENT",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2024-01-05",
"last_updated": "2026-06-04",
"certification_date": "2026-06-04",
"status": "A"
},
"taxonomies": [
{
"code": "163W00000X",
"taxonomy_group": "",
"desc": "Registered Nurse",
"state": "MA",
"license": "RN2330619",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Boston, MA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 4, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.