Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum
Hematology & Oncology Associates of Greenwich
Medical Oncology Physician in Greenwich, CT · enumerated 2006 · authorized official Dickerman Hollister, Partner.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1164430757
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Registry record
Taxonomy & classification
Authorized official
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| D100000244 | Other | CT | MEDICARE PTAN |
| 004253910 | Medicaid | CT | - |
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 type of organization is Hematology & Oncology Associates of Greenwich?
What is a Type 2 NPI?
Providers at this address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-01-14.