Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark E Ryan, M.D.
Pediatrics Physician in Milford, MA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1881629871
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Registry record
Entity type Individual (Type 1)
Name Mark E Ryan
Credential M.D.
Sex Male
Practice address Holliston Pediatric Group, 321 Fortune Blvd, Milford, MA, 01757
Phone (508) 478-5996
Enumeration date Jul 11, 2006
Last updated in NPPES Jul 8, 2007
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 NPI 1881629871 active?
Yes, as of the latest NPPES snapshot, NPI 1881629871 is active (record last updated 2007-07-08).
How do I verify Mark Ryan's NPI record?
Cross-check NPI 1881629871 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 →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.