Robert C. Quackenbush, M.D.
Medical Oncology Physician · Walla Walla, WA
Robert C. Quackenbush, M.D. is a medical oncology physician with a practice address in Walla Walla, Washington, and NPI 1962458877, issued on May 25, 2006. Check the license (Washington MD00039975, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Robert C. Quackenbush
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- MD00039975 WA
Self-reported in NPPES; status is on the state search - Practice location
- 401 W Poplar St, Walla Walla, WA 99362
- Phone
- (509) 522-5700
- Enumerated
- May 25, 2006
- Record last updated
- Jun 26, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (509) 522-5705
- Medicaid IDs
- 227516 OR
8060599 ID
1118421 WA - Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 183 in Washington → Look up another NPI →
Also registered at 401 W Poplar St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Alexandra Baker, DNPNurse Practitioner1306473202
Verify Robert C. Quackenbush in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00039975Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
54% more Medicare Part D claims than the average medical oncology physician in 2024
1,081 Medicare Part D claims for 136 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 178 claims were for opioids.
Most prescribed
- Anastrozole203 claims
- Exemestane86 claims
- Hydrocodone-Acetaminophen75 claims
- Lorazepam57 claims
- Brukinsa32 claims
- Calquence31 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.
Robert C. Quackenbush among 183 medical oncology physician records in Washington
Robert C. Quackenbush, M.D. is one of 183 medical oncology physician records with a practice address in Washington. 72% 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 12% of them.
- NPI issued2006 · 12% of these records are older, 40% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileNo · 61% of these records are
- Record last updated2013 · 70% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Washington
There are 183 medical oncology physician records in Washington.
All 183 in Washington → Every provider in Walla Walla → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- James Cunningham, M.D.Walla Walla, WA 993621568476752
- Rangaswamy Chintapatla, M.DKennewick, WA 993361003131640
- Basir Haque, MDKennewick, WA 993361912131723
- Kawal Chester, M.D.Spokane, WA 992181619963600
- Arthur Molina, M.D.Spokane, WA 992181699718007
- Howard Stang, M.D.Spokane, WA 992181710977764
- Elizabeth Gunderson, MDSpokane Valley, WA 992161053401745
- Kristine Rinn, MDSpokane Valley, WA 992161174607899
Common questions
What is Robert C. Quackenbush, M.D.'s NPI number?
Robert C. Quackenbush, M.D.'s National Provider Identifier (NPI) is 1962458877, issued on May 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert C. Quackenbush, M.D. located?
The NPPES record lists a practice address at 401 W Poplar St, Walla Walla, WA, 99362. Phone: (509) 522-5700. Providers update this record themselves, so call before visiting.
How can I verify Robert C. Quackenbush, M.D.'s license?
NPPES lists Washington license number MD00039975, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert C. Quackenbush, M.D. prescribe under Medicare Part D?
In 2024, Robert C. Quackenbush, M.D. had 1,081 Medicare Part D claims for 136 beneficiaries; the average among medical oncology physician prescribers was 703. Part D covers Medicare prescriptions only.
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.