DR. JOHN LEANDER PO MD, PHD
NPI 1366638561
Internal Medicine in Tucson, AZ
About Dr. John Leander Po Md, Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN LEANDER PO MD, PHD (NPI 1366638561) is an individual internal medicine provider in Tucson, Arizona, licensed in Arizona (37948) and active in the NPI registry since September 2007. He is enrolled in Medicare PECOS, maintains a secondary practice location in Tucson, and is a graduate of Other (2003).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. John Leander Po Md, Phd is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show John Leander Po reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Apache Junction, AZ 85120
- Reassigned Medicare billing, Arizona enrollment
- 93 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 85712 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 4
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 8
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Leander Po's NPI number?
The NPI number for John Leander Po is 1366638561. It was assigned to this individual provider in the NPPES registry on September 20, 2007.
Where is John Leander Po located?
John Leander Po practices at 3902 E Grant Rd, Tucson, AZ 85712. The listed phone number is (520) 468-4801.
What is John Leander Po's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is John Leander Po enrolled in Medicare?
Yes. John Leander Po is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for John Leander Po's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Leander Po reassigns Medicare benefits to Oak Street Health Physicians Group Of Arizona PLLC (Apache Junction, AZ). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Leander Po's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for John Leander Po was last updated on June 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. John Leander Po, MD, PHD · NPI 1366638561
Internal Medicine physician in Tucson, Arizona. Individual provider, active in the CMS NPPES registry since September 20, 2007.
## Identity
- **NPI:** 1366638561 (Entity type: Individual)
- **Enumerated:** September 20, 2007
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 37948 (Arizona)
- **Sole proprietor:** No
## Practice location
- **Address:** 3902 E GRANT RD, Tucson, AZ 85712-2558
- **Phone:** (520) 468-4801
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Oak Street Health Physicians Group Of Arizona PLLC (NPI 1063083590, Apache Junction, AZ), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** June 12, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1366638561) · Data from the CMS NPPES public registry.