Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Jonathan L Held, M.D.
Specialist in Ayer, MA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1699767608
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Registry record
Entity type Individual (Type 1)
Name Dr. Jonathan L Held
Credential M.D.
Sex Male
Practice address 190 Groton Rd, Suite 180, Ayer, MA, 01432
Phone (978) 772-7221
Fax (978) 772-5849
Enumeration date Aug 16, 2005
Last updated in NPPES Jul 13, 2026
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 Jonathan Held?
Jonathan Held is registered in NPPES with the primary taxonomy of Specialist. 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
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-13.