Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum
Grass Valley Hematology/Oncology Med Grp
Hematology & Oncology Physician in Grass Valley, CA · enumerated 2006 · authorized official David Campbell, Partner.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1720035561
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Registry record
Taxonomy & classification
Authorized official
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| P00340104 | Other | CA | RAILROAD MEDICARE PTAN - DAVID L CAMPBELL, MD |
| 1518959188 | Other | - | INDIVIDUAL MD NPI# WILLIAM A NEWSOM JR |
| DF1247 | Other | - | RAILROAD MEDICARE PTAN FOR COMPANY CURRENT AS OF 08/2010 |
| 1750373239 | Other | - | INDIVIDUAL MD NPI# - DAVID CAMPBELL |
| GR0061600 | Medicaid | CA | - |
| P00314945 | Other | CA | RAILROAD MEDICARE PTAN - WILLIAM A NEWSON, JR, MD |
| ZZZ70159Z | Other | - | PREVIOUS MEDICARE PTAN |
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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Providers at this address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-08-26.