Donna Walker, M.D.
Hematology & Oncology Physician · Lompoc, CA
Donna Walker, M.D. is a hematology & oncology physician with a practice address in Lompoc, California, and NPI 1528086964, issued on Jul 17, 2006. Check the license (California A55693, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Donna Walker
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- A55693 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1201 E Ocean Ave Ste B, Lompoc, CA 93436
- Phone
- (805) 735-1155
- Enumerated
- Jul 17, 2006
- Record last updated
- May 12, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (805) 735-1133
- Medicaid ID
- 00A556930 CA
- Medicare enrollment
- Enrolled (PECOS I20100121000512); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 1994
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Verify Donna Walker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A55693Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
707 Medicare Part D claims for 102 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 23% of claims. 67 claims were for opioids.
Most prescribed
- Anastrozole104 claims
- Dexamethasone32 claims
- Potassium Chloride27 claims
- Prednisone27 claims
- Hydrocodone-Acetaminophen21 claims
- Ondansetron Odt20 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $129.01
6 payments; by number, the most common kind was food and beverage; the largest payer was Astellas Pharma US Inc. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
One hospital affiliation
- Lompoc Valley Medical CenterLompoc, CA · Acute Care Hospitals1 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Donna Walker among 1,583 hematology & oncology physician records in California
Donna Walker, M.D. is one of 1,583 hematology & oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 54% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1994 · median 2003 among the 1,124 with a school on file
- Record last updated2016 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in Lompoc → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Melani Shaum, M.D.Lompoc, CA 934361144333477
- Deborah Villa, MDAtascadero, CA 934221194726042
- David Palchak, M.D.Arroyo Grande, CA 934201396815965
- Keith Ayrons, M.D.Santa Maria, CA 934541831143775
- Wei Bai, MDSanta Maria, CA 934541053567545
- Heather Cunningham, MDSanta Maria, CA 934541134359581
- Robert Dichmann, MDSanta Maria, CA 934541245232578
- Kathleen Kennedy, M.D.Santa Maria, CA 934541528080967
Common questions
What is Donna Walker, M.D.'s NPI number?
Donna Walker, M.D.'s National Provider Identifier (NPI) is 1528086964, issued on Jul 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Donna Walker, M.D. located?
The NPPES record lists a practice address at 1201 E Ocean Ave Ste B, Lompoc, CA, 93436. Phone: (805) 735-1155. Providers update this record themselves, so call before visiting.
How can I verify Donna Walker, M.D.'s license?
NPPES lists California license number A55693, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Donna Walker, M.D. prescribe under Medicare Part D?
In 2024, Donna Walker, M.D. had 707 Medicare Part D claims for 102 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Donna Walker, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.