William Robert La Rosa, M.D.
Family Medicine Physician · Phoenix, AZ
William Robert La Rosa, M.D. is a family medicine physician with a practice address in Phoenix, Arizona, and NPI 1710372651, issued on Mar 30, 2015. Check the license (Arizona 56120, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- William Robert La Rosa
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 56120 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 4212 N 16TH St, Phoenix, AZ 85016
- Phone
- (602) 263-1200
- Enumerated
- Mar 30, 2015
- Record last updated
- May 15, 2026
- Fax
- (602) 263-1619
- Medicare enrollment
- Enrolled (PECOS I20220209000700); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,119 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 William Robert La Rosa in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 56120Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average family medicine physician in 2024
1,486 Medicare Part D claims for 114 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 34% of claims. 41 claims were for opioids.
Most prescribed
- Ozempic83 claims
- Lantus Solostar79 claims
- Jardiance77 claims
- Atorvastatin Calcium59 claims
- Albuterol Sulfate Hfa55 claims
- Sure Comfort Pen Needle51 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.
William Robert La Rosa among 3,119 family medicine physician records in Arizona
William Robert La Rosa, M.D. is one of 3,119 family 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 2015, is newer than 73% of them.
- NPI issued2015 · 73% of these records are older, 24% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2015 · median 2006 among the 1,775 with a school on file
- Record last updated2026 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
649 family medicine physician records list a practice address in Phoenix
They are 649 of the 31,399 NPPES records with a practice address in Phoenix, and 3,119 family medicine physician records in Arizona.
All 3,119 in Arizona → Every provider in Phoenix → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- James Bennett, M.D.Phoenix, AZ 850161194708396
- Paul Bloomquist, MDPhoenix, AZ 850161730167065
- Jacqueline Doris, M.D.Phoenix, AZ 850161922090992
- Lawrence Kramer, M.D.Phoenix, AZ 850161952381295
- Kathleen North-Wilhelm, M.D.Phoenix, AZ 850161952389017
- Heather O'Toole, M.D.Phoenix, AZ 850161992797880
- Amy Jo Overlin, M.D.Phoenix, AZ 850161811958101
- Judy Pinsonneault, D.O.Phoenix, AZ 850161184627648
Common questions
What is William Robert La Rosa, M.D.'s NPI number?
William Robert La Rosa, M.D.'s National Provider Identifier (NPI) is 1710372651, issued on Mar 30, 2015. An NPI identifies a provider in billing; it is not a license.
Where is William Robert La Rosa, M.D. 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 William Robert La Rosa, M.D.'s license?
NPPES lists Arizona license number 56120, 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 Robert La Rosa, M.D. prescribe under Medicare Part D?
In 2024, William Robert La Rosa, M.D. had 1,486 Medicare Part D claims for 114 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.