Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Ryan Thomas Callahan, DPM
Podiatrist in Boston, MA · enumerated 2021.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1265010284
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Dr. Ryan Thomas Callahan
Credential DPM
Sex Male
Practice address 150 S Huntington Ave, Boston, MA, 02130
Phone (857) 364-4802
Enumeration date Mar 31, 2021
Last updated in NPPES Feb 12, 2026
Taxonomy & licenses
DPM · Doctor of Podiatric Medicine: A physician specializing in medical and surgical care of the foot and ankle.
About the DPM 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 Ryan Callahan?
Ryan Callahan is registered in NPPES with the primary taxonomy of Podiatrist. 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 → Thomas Fantes Family Medicine Physician · Boston, MA NPI 1972500429 Elisabeth Buchanan Social Worker · Boston, MA NPI 1285636159 Edward Lew Gastroenterology Physician · Jamaica Plain, MA NPI 1376526459 Michael Dawes Psychiatry Physician · Boston, MA NPI 1841274594 Barbara Cooper Clinical Psychologist · Boston, MA NPI 1720063084 Joseph Rafferty Family Medicine Physician · Boston, MA NPI 1669459723 Nhan Do Internal Medicine Physician · Boston, MA NPI 1750353967 Christopher Conroy Physical Therapist · Boston, MA NPI 1942273495
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-02-12.