Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Margaret Grinnell
Peer Specialist in Boulder, CO · enumerated 2014.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1487052569
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Registry record
Entity type Individual (Type 1)
Name Margaret Grinnell
Sex Female
Practice address 1000 Alpine Ave, Boulder, CO, 80304
Phone (303) 440-4842
Fax (303) 374-8156
Enumeration date Dec 5, 2014
Last updated in NPPES Dec 5, 2014
Taxonomy & licenses
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 Margaret Grinnell?
Margaret Grinnell is registered in NPPES with the primary taxonomy of Peer Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-12-05.