John Leander Po, MD, PHD
Internal Medicine Physician · Tucson, AZ
John Leander Po, MD, PHD is an internal medicine physician with a practice address in Tucson, Arizona, and NPI 1366638561, issued on Sep 20, 2007. Check the license (Arizona 37948, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- John Leander Po
- Credential
- MD, PHD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 37948 AZ
218627 MA
Self-reported in NPPES; status is on the state search - Practice location
- 3902 E Grant RD, Tucson, AZ 85712
- Phone
- (520) 468-4801
- Enumerated
- Sep 20, 2007
- Record last updated
- Jun 12, 2025
- Medicare enrollment
- Enrolled (PECOS I20080610000760); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Also registered at 3902 E Grant RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Audrey Gray, PA-CPhysician Assistant1083158067
- Colleen Gumm, NPGerontology Nurse Practitioner1568485951
- Michelle Johnson, LPCProfessional Counselor1811465784
- Rebecca Jones, FNP-BCFamily Nurse Practitioner1043900491
Verify John Leander Po in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 37948Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% more Medicare Part D claims than the average internal medicine physician in 2024
4,310 Medicare Part D claims for 369 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 75 claims were for opioids.
Most prescribed
- Atorvastatin Calcium294 claims
- Levothyroxine Sodium223 claims
- Amlodipine Besylate178 claims
- Losartan Potassium176 claims
- Lisinopril145 claims
- Gabapentin105 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 2 group practices
- Iora Senior Health LLCTucson, AZ
- Oak Street Health Physicians Group OF Arizona PLLCTucson, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Leander Po among 2,853 internal medicine physician records in Arizona
John Leander Po, MD, PHD 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 fileYes · 58% of these records are
- Graduated2003 · median 2003 among the 1,643 with a school on file
- Record last updated2025 · 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).
651 internal medicine physician records list a practice address in Tucson
They are 651 of the 18,788 NPPES records with a practice address in Tucson, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Tucson → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- William Abraham, MDTucson, AZ 857121669468195
- Sheela Bhat, M.D.Tucson, AZ 857121598752008
- Muralikrishna Bhat, M.D.Tucson, AZ 857121114914637
- Douglas Bischoff, M.D.Tucson, AZ 857121821085333
- George Haloftis, D.O.Tucson, AZ 857121740277268
- Thomas Headlee, M.D.Tucson, AZ 857121194711630
- Kathleen Iveson, M.D.Tucson, AZ 857121720074263
- Gerome Kantor, MDTucson, AZ 857121407850290
Common questions
What is John Leander Po, MD, PHD's NPI number?
John Leander Po, MD, PHD's National Provider Identifier (NPI) is 1366638561, issued on Sep 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Leander Po, MD, PHD located?
The NPPES record lists a practice address at 3902 E Grant RD, Tucson, AZ, 85712. Phone: (520) 468-4801. Providers update this record themselves, so call before visiting.
How can I verify John Leander Po, MD, PHD's license?
NPPES lists Arizona license number 37948, 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 John Leander Po, MD, PHD prescribe under Medicare Part D?
In 2024, John Leander Po, MD, PHD had 4,310 Medicare Part D claims for 369 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.