Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Giles F Whalen, M.D.
Surgery Physician in Worcester, MA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1538141957
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Registry record
Entity type Individual (Type 1)
Name Dr. Giles F Whalen
Credential M.D.
Sex Male
Practice address 119 Belmont St, Department of Surgical Oncology, Worcester, MA, 01605
Phone (508) 334-5202
Fax (508) 334-5089
Enumeration date Nov 20, 2005
Last updated in NPPES Jul 31, 2024
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 3113922 | Medicaid | MA | - |
| 110053383A | Medicaid | MA | - |
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
Where does Giles Whalen practice?
The practice location on file with NPPES is in Worcester, MA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Giles Whalen?
The National Provider Identifier (NPI) for Giles Whalen is 1538141957, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-07-31.