John Ramsey Warfield, MD.
Diagnostic Radiology Physician · Phoenix, AZ
John Ramsey Warfield, MD. is a diagnostic radiology physician with a practice address in Phoenix, Arizona, and NPI 1225118151, issued on Oct 16, 2006. Check the license on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- John Ramsey Warfield
- Credential
- MD.
- Primary taxonomy
- Diagnostic Radiology Physician 2085R0202X
- License number
- MD044853E PA
Self-reported in NPPES; status is on the state search - Practice location
- 4212 N 16TH St, Phoenix, AZ 85016
- Phone
- (602) 263-1200
- Enumerated
- Oct 16, 2006
- Record last updated
- Aug 29, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (602) 200-5383
- Medicaid ID
- 749616 AZ
- Medicare enrollment
- Enrolled (PECOS I20100322000552); accepts Medicare assignment
- Medical or professional school
- University Of Maryland School Of Medicine, 1972
- Entity
- Type 1 · individual
8 nearest diagnostic radiology physician records → All 869 in Arizona → Look up another NPI →
Also registered at 4212 N 16TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Andrea Aarseth, RNCritical Care Medicine Registered Nurse1235297292
- Deirdre Abellada, RN, PHNRegistered Nurse1710259395
- Joby Abraham, RNRegistered Nurse1376814046
- Frederick Abramek, MS, PHARMACISTPharmacist1528278736
- Karen AcostaRegistered Nurse1659748671
- Danton AdairRegistered Nurse1114387917
Verify John Ramsey Warfield in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical BoardCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% more Medicare Part D claims than the average diagnostic radiology physician in 2024
55 Medicare Part D claims, against an average of 51 among the 2,711 providers of this specialty who prescribed in Part D. Brand-name drugs were 53% of claims.
Most prescribed
- Mounjaro17 claims
- Ezetimibe12 claims
- Eliquis11 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.
Bills Medicare through one group practice
- Dhew Ind Hlth SV Hlth Svs And Mntl Hlth AdmPhoenix, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Ramsey Warfield among 869 diagnostic radiology physician records in Arizona
John Ramsey Warfield, MD. is one of 869 diagnostic radiology physician records with a practice address in Arizona. 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 16% of them.
- NPI issued2006 · 16% of these records are older, 49% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1972 · median 2003 among the 573 with a school on file
- Record last updated2011 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Diagnostic Radiology Physician providers in Arizona
There are 869 diagnostic radiology physician records in Arizona.
All 869 in Arizona → Every provider in Phoenix → Diagnostic Radiology Physician nationwide →
The 8 diagnostic radiology physician records with the nearest ZIP codes
- Asmaa Aamir, M.D.Phoenix, AZ 850161912163791
- Dianna Bardo, MDPhoenix, AZ 850161881686111
- Drew Davis, MDPhoenix, AZ 850161568624146
- David Dickman, M.D.Phoenix, AZ 850161669561064
- Sreechandra Donepudi, MDPhoenix, AZ 850161578686242
- George Engisch, D.O.Phoenix, AZ 850161841398245
- Marshall Lustgarten, M.D.Phoenix, AZ 850161871584458
- Jignesh Patel, M.D.Phoenix, AZ 850161023136322
Common questions
What is John Ramsey Warfield, MD.'s NPI number?
John Ramsey Warfield, MD.'s National Provider Identifier (NPI) is 1225118151, issued on Oct 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Ramsey Warfield, MD. located?
The NPPES record lists a practice address at 4212 N 16TH St, Phoenix, AZ, 85016. Phone: (602) 263-1200. Providers update this record themselves, so call before visiting.
How can I verify John Ramsey Warfield, MD.'s license?
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 John Ramsey Warfield, MD. prescribe under Medicare Part D?
In 2024, John Ramsey Warfield, MD. had 55 Medicare Part D claims; the average among diagnostic radiology physician prescribers was 51. 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.