Michael Mackenzie Johnson, M.D.
Internal Medicine Physician · Sun City, AZ
Michael Mackenzie Johnson, M.D. is an internal medicine physician with a practice address in Sun City, Arizona, and NPI 1609869643, issued on Aug 24, 2005. Check the license (Arizona 12960, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Michael Mackenzie Johnson
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 12960 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 14678 N Del Webb Blvd, Sun City, AZ 85351
- Phone
- (623) 933-8289
- Enumerated
- Aug 24, 2005
- Record last updated
- Sep 9, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (623) 933-2596
- Medicare enrollment
- Enrolled (PECOS I20101013001196); accepts Medicare assignment
- Medical or professional school
- University Of Arizona College Of Medicine, 1983
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Also registered at 14678 N Del Webb Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Krista Brancel, FNP, NP-C, MSN, BSNFamily Nurse Practitioner1548825656
- Mark Brown, M.D.Internal Medicine Physician1225021264
- Christopher Huber, FNP-CFamily Nurse Practitioner1124551965
- Ron Loomis, APRN FNP-BCFamily Nurse Practitioner1740054469
- Thomas Maxwell, M.D.Internal Medicine Physician1396738324
- Cynthia Medina, D.O.Family Medicine Physician1710064183
Verify Michael Mackenzie Johnson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 12960Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.9 times the Medicare Part D claims of the average internal medicine physician in 2024
12,281 Medicare Part D claims for 1,100 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Losartan Potassium908 claims
- Levothyroxine Sodium787 claims
- Atorvastatin Calcium582 claims
- Amlodipine Besylate543 claims
- Rosuvastatin Calcium525 claims
- Metoprolol Succinate438 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: $1,118.68
60 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Maxwell GroupSun City, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Mackenzie Johnson among 2,853 internal medicine physician records in Arizona
Michael Mackenzie Johnson, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 87% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1983 · median 2003 among the 1,643 with a school on file
- Record last updated2016 · 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).
53 internal medicine physician records list a practice address in Sun City
They are 53 of the 813 NPPES records with a practice address in Sun City, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Sun City → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mark Brown, M.D.Sun City, AZ 853511225021264
- Ramanjit Dhaliwal, MDSun City, AZ 853511689669095
- Trinh Doan, MDSun City, AZ 853511518966878
- Manoj Makhija, M.D.Sun City, AZ 853511588657365
- Thomas Maxwell, M.D.Sun City, AZ 853511396738324
- Cristina Murgiuc, MDSun City, AZ 853511154314946
- Srinivasa Palnati, MDSun City, AZ 853511881688992
- Shantilal Patel, M.D.Sun City, AZ 853511316941248
Common questions
What is Michael Mackenzie Johnson, M.D.'s NPI number?
Michael Mackenzie Johnson, M.D.'s National Provider Identifier (NPI) is 1609869643, issued on Aug 24, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Michael Mackenzie Johnson, M.D. located?
The NPPES record lists a practice address at 14678 N Del Webb Blvd, Sun City, AZ, 85351. Phone: (623) 933-8289. Providers update this record themselves, so call before visiting.
How can I verify Michael Mackenzie Johnson, M.D.'s license?
NPPES lists Arizona license number 12960, 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 Michael Mackenzie Johnson, M.D. prescribe under Medicare Part D?
In 2024, Michael Mackenzie Johnson, M.D. had 12,281 Medicare Part D claims for 1,100 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.