Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Margaret O.P. Fallon, MD
Pediatrics Physician in Waltham, MA · enumerated 2017.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1780104968
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Margaret O.P. Fallon
Credential MD
Sex Female
Practice address 52 Second Ave, Waltham, MA, 02451
Phone (617) 726-2000
Enumeration date Jun 20, 2017
Last updated in NPPES Apr 21, 2025
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
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
What specialty is Margaret Fallon?
Margaret Fallon is registered in NPPES with the primary taxonomy of Pediatrics Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all → Robert Schainfeld Internal Medicine Physician · Waltham, MA NPI 1740278118 Natasha Edwards Family Nurse Practitioner · Waltham, MA NPI 1942540737 Rebecca Blake Physician Assistant · Waltham, MA NPI 1043700214 Michael Vrolyk Physician Assistant · Waltham, MA NPI 1598222168 Yiming Yu Physician Assistant · Waltham, MA NPI 1255070413 Matthew Dimatteo Family Nurse Practitioner · Waltham, MA NPI 1992687149 Cristin Lavita Pediatric Registered Nurse · Waltham, MA NPI 1154265726
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-04-21.