Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
William J Parker, MD
Family Medicine Physician in Leominster, MA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1598733511
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Registry record
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 042472266 | Other | - | ONE HEALTH PLAN |
| 784171 | Other | - | MVP HEALTH CARE |
| 9900069 | Other | - | FALLON COMMUNITY HEALTH P |
| AA1222 | Other | - | HARVARD PILGRIM HEALTH CA |
| 080129481 | Other | - | RAILROAD MEDICARE |
| 1150243 | Other | - | FRIST HEALTH |
| 7797329 | Other | - | AETNA US HEALTHCARE |
| J02366 | Other | - | BLUE CARE ELECT |
| J02366 | Other | - | BLUE SHIELD INDEMNITY |
| 26923 | Other | - | HEALTHY START |
| 0100290 | Other | - | EVERCARE |
| 042472266 | Other | - | PRIVATE HEALTHCARE SYSTEM |
| 042472266 | Other | - | THREE RIVERS |
| 6175538 | Medicaid | MA | - |
| 0303018 | Other | - | CIGNA HEALTH PLAN |
| 042472266 | Other | - | HEALTHCARE VALUE MANAGEME |
| 26923 | Other | - | CHILDRENS MEDICAL SECURIT |
| J02366 | Other | - | BLUE SHIELD HMO BLUE |
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
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Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-02-20.