Keith Westley Shillito, M.D.
Adult Medicine Physician · Parker, AZ
Keith Westley Shillito, M.D. is an adult medicine physician with a practice address in Parker, Arizona, and NPI 1417954850, issued on Jun 30, 2005. Check the license (Arizona 32755, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Keith Westley Shillito
- Credential
- M.D.
- Primary taxonomy
- Adult Medicine Physician 207QA0505X
- License number
- 32755 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 905 Fiesta, Parker, AZ 85344
- Phone
- (928) 669-2225
- Enumerated
- Jun 30, 2005
- Record last updated
- Feb 26, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (928) 669-6751
- Medicaid IDs
- 862690 AZ
ZP03006701 AZ
480046 AZ - Medicare enrollment
- Enrolled (PECOS I20040630000749); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Human Medicine, 1997
- Entity
- Type 1 · individual
8 nearest adult medicine physician records → All 62 in Arizona → Look up another NPI →
Verify Keith Westley Shillito in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 32755Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average adult medicine physician in 2024
1,277 Medicare Part D claims for 163 beneficiaries, against an average of 3,002 among the 1,307 providers of this specialty who prescribed in Part D. 182 claims were for opioids.
Most prescribed
- Oxycodone Hcl70 claims
- Hydrocodone-Acetaminophen64 claims
- Levothyroxine Sodium53 claims
- Simvastatin44 claims
- Atorvastatin Calcium41 claims
- Lisinopril38 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 15 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Parker Medical Center, Ltd.Parker, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Keith Westley Shillito among 62 adult medicine physician records in Arizona
Keith Westley Shillito, M.D. is one of 62 adult medicine physician records with a practice address in Arizona. 63% 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, 92% newer
- In a Medicare fileYes · 63% of these records are
- In the CMS Doctors and Clinicians fileYes · 45% of these records are
- Graduated1997 · median 2008 among the 28 with a school on file
- Record last updated2014 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QA0505X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Adult Medicine Physician providers in Arizona
There are 62 adult medicine physician records in Arizona.
All 62 in Arizona → Every provider in Parker → Adult Medicine Physician nationwide →
The 8 adult medicine physician records with the nearest ZIP codes
- Michael Putland, M.D.Goodyear, AZ 853381679576615
- Terry Stevenson, M.D.Yuma, AZ 853641184610800
- James Garland, M.D.Yuma, AZ 853651366489973
- Adil Baig, M.D.Yuma, AZ 853671356724967
- Linh Nguyen, M.D., M.S., CPESurprise, AZ 853741275596827
- Joseph Peggs, MDCarefree, AZ 853771730345729
- Jordan GabbardGlendale, AZ 853081992500060
- Jenna Bolger, FNPGlendale, AZ 853061265163323
Common questions
What is Keith Westley Shillito, M.D.'s NPI number?
Keith Westley Shillito, M.D.'s National Provider Identifier (NPI) is 1417954850, issued on Jun 30, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Keith Westley Shillito, M.D. located?
The NPPES record lists a practice address at 905 Fiesta, Parker, AZ, 85344. Phone: (928) 669-2225. Providers update this record themselves, so call before visiting.
How can I verify Keith Westley Shillito, M.D.'s license?
NPPES lists Arizona license number 32755, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Keith Westley Shillito, M.D. prescribe under Medicare Part D?
In 2024, Keith Westley Shillito, M.D. had 1,277 Medicare Part D claims for 163 beneficiaries; the average among adult medicine physician prescribers was 3,002. Part D covers Medicare prescriptions only.
What is Keith Westley Shillito, M.D.'s MIPS final score?
The 2023 MIPS final score is 15 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.