Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Heather C. Larsen, MS, CAGS, LMHC
Mental Health Counselor in Ware, MA · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1619023421
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Registry record
Entity type Individual (Type 1)
Name Ms. Heather C. Larsen
Credential MS, CAGS, LMHC
Sex Female
Practice address 96 South St, Ware, MA, 01082
Phone (413) 967-6241
Enumeration date Jan 25, 2007
Last updated in NPPES May 17, 2011
Taxonomy & licenses
101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 5286 (MA) Primary
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 1619023421 active?
Yes, as of the latest NPPES snapshot, NPI 1619023421 is active (record last updated 2011-05-17).
How do I verify Heather Larsen's NPI record?
Cross-check NPI 1619023421 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 → Mary-Alice Austin Clinical Social Worker · Ware, MA NPI 1982618443 Lyla Novak Mental Health Counselor · Ware, MA NPI 1912053703 Alice Lesak Clinical Social Worker · Ware, MA NPI 1609992312 Christine Baker-Griffin Clinical Social Worker · Ware, MA NPI 1326164096 Sarah Buckner Clinical Social Worker · Ware, MA NPI 1538285218 Jane Simonds Clinical Social Worker · Ware, MA NPI 1144346891 Deanne Kimball-Klingensmith Clinical Social Worker · Ware, MA NPI 1174649800 Patricia Hempel Mental Health Counselor · Ware, MA NPI 1790973295
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-05-17.