Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Barry Grant Zallen, M.D.
Pediatrics Physician in Boston, MA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1588667539
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Dr. Barry Grant Zallen
Credential M.D.
Sex Male
Practice address 300 Longwood Ave, Children'S Hospital, Au 105, Boston, MA, 02115
Phone (617) 919-6263
Enumeration date May 23, 2005
Last updated in NPPES Oct 22, 2014
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
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.
What specialty is Barry Zallen?
Barry Zallen 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.
Other providers at this practice address
Browse all → Thomas Hamilton Pediatric Surgery Physician · Boston, MA NPI 1811991201 Stacy Drury Child & Adolescent Psychiatry Physician · Boston, MA NPI 1316945116 James Dinardo Anesthesiology Physician · Boston, MA NPI 1962496281 Eric Fleegler Pediatric Emergency Medicine (Pediatrics) Physician · Boston, MA NPI 1215923362 Peter Kriz Pediatric Sports Medicine Physician · Boston, MA NPI 1881681310 Kira Dies Genetic Counselor (M.S.) · Boston, MA NPI 1710975644 Jessie Hastings Genetic Counselor (M.S.) · Boston, MA NPI 1518955442 Lisa Bergersen Pediatric Cardiology Physician · Boston, MA NPI 1942299730
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-10-22.