Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Donna Walker, M.D.

Hematology & Oncology Physician in Lompoc, CA · enumerated 2006 · practices at Mid-County Hematology and Oncology, A Professional Medical Corporation.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1528086964

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Registry record

Entity type Individual (Type 1)

Name Dr. Donna Walker

Credential M.D.

Sex Female

Practice address 1201 E Ocean Ave Ste B, Lompoc, CA, 93436

Phone (805) 735-1155

Fax (805) 735-1133

Enumeration date Jul 17, 2006

Last updated in NPPES May 12, 2016

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License A55693 (CA) Primary

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
00A556930	Medicaid	CA	-

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.

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Frequently asked questions

How do I verify Donna Walker's NPI record?

Cross-check NPI 1528086964 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1528086964 active?

Yes, as of the latest NPPES snapshot, NPI 1528086964 is active (record last updated 2016-05-12).

Other providers at this practice address

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Mid-County Hematology and Oncology, A Professional Medical Corporation Hematology & Oncology Physician · Lompoc, CA NPI 1285959817

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-05-12.