Robert Sixto Diaz, PA-C
Physician Assistant · Richland, WA
Robert Sixto Diaz, PA-C is a physician assistant with a practice address in Richland, Washington, and NPI 1356328892, issued on Dec 27, 2005. Check the license (Washington PA10004234, as entered in NPPES) with the Washington board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Robert Sixto Diaz
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA10004234 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1050 Gilmore, Suite, Richland, WA 99352
- Phone
- (509) 943-5300
- Enumerated
- Dec 27, 2005
- Record last updated
- Oct 22, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (509) 943-5331
- Medicaid ID
- 8359242 WA
- Medicare enrollment
- Enrolled (PECOS I20040707000175); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 3,718 in Washington → Look up another NPI →
Also registered at 1050 Gilmore, Suite
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Bobby Linares, PA-CMedical Physician Assistant1932319399
Verify Robert Sixto Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Washington board licenses this profession
Search for license PA10004234Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average physician assistant in 2024
19 Medicare Part D claims for 15 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Industry payments in 2024: $187.84
3 payments; by number, the most common kind was food and beverage; the largest payer was Nevro Corp. The 64,719 providers of this specialty with any payment received $841.65 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.
Bills Medicare through one group practice
- Apex Spine InstituteRichland, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert Sixto Diaz among 3,718 physician assistant records in Washington
Robert Sixto Diaz, PA-C is one of 3,718 physician assistant records with a practice address in Washington. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 97% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2001 · median 2017 among the 2,460 with a school on file
- Record last updated2012 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
81 physician assistant records list a practice address in Richland
They are 81 of the 1,955 NPPES records with a practice address in Richland, and 3,718 physician assistant records in Washington.
All 3,718 in Washington → Every provider in Richland → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Stephen Allen, PA-CRichland, WA 993521891878609
- Curtis Campbell, MMSC. PA-CRichland, WA 993521952536211
- Daniel Elliott, PA-CRichland, WA 993521023004033
- Amanda Friese, PA-CRichland, WA 993521417925850
- Amy Hoger, PA-CRichland, WA 993521003029950
- Matthew Huwe, PA-CRichland, WA 993521437309267
- Karen Nguyen, PA-CRichland, WA 993521992989693
- Larry Nye, PA-CRichland, WA 993521457686826
Common questions
What is Robert Sixto Diaz, PA-C's NPI number?
Robert Sixto Diaz, PA-C's National Provider Identifier (NPI) is 1356328892, issued on Dec 27, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Robert Sixto Diaz, PA-C located?
The NPPES record lists a practice address at 1050 Gilmore, Suite, Richland, WA, 99352. Phone: (509) 943-5300. Providers update this record themselves, so call before visiting.
How can I verify Robert Sixto Diaz, PA-C's license?
NPPES lists Washington license number PA10004234, as entered by the provider. Search the Washington board that licenses this profession; the NPPES record confirms identity only.
How much does Robert Sixto Diaz, PA-C prescribe under Medicare Part D?
In 2024, Robert Sixto Diaz, PA-C had 19 Medicare Part D claims for 15 beneficiaries; the average among physician assistant prescribers was 830. 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.