William E. Merrell, M.D.
Internal Medicine Physician · Prescott Valley, AZ
William E. Merrell, M.D. is an internal medicine physician with a practice address in Prescott Valley, Arizona, and NPI 1942339254, issued on Mar 4, 2007. Check the license (Arizona 11399, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- William E. Merrell
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 11399 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 3221 N Windsong Dr, Prescott Valley, AZ 86314
- Phone
- (928) 910-7010
- Enumerated
- Mar 4, 2007
- Record last updated
- Apr 22, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (928) 910-7011
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Also registered at 3221 N Windsong Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Pedro Farinha, M.D.Internal Medicine Physician1033113006
- Ellen Lorenz, CFNPFamily Medicine Physician1760444509
- Milda Rogers, CFNPFamily Nurse Practitioner1619952413
- Mary Roth, M.S.P.T.Physical Therapist1629089693
Verify William E. Merrell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 11399Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
19 Medicare Part D claims for 14 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
William E. Merrell among 2,853 internal medicine physician records in Arizona
William E. Merrell, M.D. is one of 2,853 internal medicine physician records with a practice address in Arizona. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 45% of them.
- NPI issued2007 · 45% of these records are older, 47% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2020 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in Arizona
There are 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Prescott Valley → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Pedro Farinha, M.D.Prescott Valley, AZ 863141033113006
- Rajiv Jetly, M.D.Prescott Valley, AZ 863141861494247
- Kara Johnson, M.D.Prescott Valley, AZ 863141942251996
- August Bergman, M.D.Prescott, AZ 863131184732604
- Daniel Collins, MDPrescott, AZ 863131922033505
- George Cristea, MDPrescott, AZ 863131336179035
- David Duensing, MDPrescott, AZ 863131922039395
- Stephanie Duensing, MDPrescott, AZ 863131346270170
Common questions
What is William E. Merrell, M.D.'s NPI number?
William E. Merrell, M.D.'s National Provider Identifier (NPI) is 1942339254, issued on Mar 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is William E. Merrell, M.D. located?
The NPPES record lists a practice address at 3221 N Windsong Dr, Prescott Valley, AZ, 86314. Phone: (928) 910-7010. Providers update this record themselves, so call before visiting.
How can I verify William E. Merrell, M.D.'s license?
NPPES lists Arizona license number 11399, 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 William E. Merrell, M.D. prescribe under Medicare Part D?
In 2024, William E. Merrell, M.D. had 19 Medicare Part D claims for 14 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.