Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Nancy J Schaeffer, NP
Nurse Practitioner in Boston, MA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1427113067
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Registry record
Entity type Individual (Type 1)
Name Nancy J Schaeffer
Credential NP
Sex Female
Practice address 100 Blossom Street, Cox 1 Hematology Oncology Associates, Boston, MA, 02114
Phone (617) 726-8698
Enumeration date Dec 26, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 117790 (MA) Primary
NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority.
About the NP credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| NP4264 | Other | MA | BS |
| 0327301 | Medicaid | MA | - |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Is NPI 1427113067 active?
Yes, as of the latest NPPES snapshot, NPI 1427113067 is active (record last updated 2007-07-08).
How do I verify Nancy Schaeffer's NPI record?
Cross-check NPI 1427113067 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all → Bruce Chabner Internal Medicine Physician · Boston, MA NPI 1467443176 Steven Mcafee Medical Oncology Physician · Boston, MA NPI 1588647945 Aleena Banerji Allergy & Immunology Physician · Boston, MA NPI 1063495562 Shannon Macdonald Radiation Oncology Physician · Boston, MA NPI 1497713853 Robert Sackstein Internal Medicine Physician · Boston, MA NPI 1306887302 Thomas Roberts Hematology & Oncology Physician · Boston, MA NPI 1013929082 Othon Iliopoulos Medical Oncology Physician · Boston, MA NPI 1447352448 Kevin Oh Radiation Oncology Physician · Boston, MA NPI 1780703124
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.