STEPHEN SHEPHERD JOHNSTON MD
NPI 1730525841
Radiology - Diagnostic Radiology in Tucson, AZ
About Stephen Shepherd Johnston Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
STEPHEN SHEPHERD JOHNSTON MD (NPI 1730525841) is an individual diagnostic radiology provider in Tucson, Arizona, licensed in Arizona (R73777) and active in the NPI registry since May 2013. He is enrolled in Medicare PECOS, is affiliated with Our Lady Of The Lake Regional Medical Center, and maintains a secondary practice location in Marianna.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Accepted Insurance
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
Stephen Shepherd Johnston Md 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 Reassignments
65Medicare enrollment records show Stephen Johnston reassigns Medicare billing to 65 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Sierra Vista, AZ 85635
- Reassigned Medicare billing, Arizona enrollment
- 26 clinicians in this Medicare group
Nogales, AZ 85621
- Reassigned Medicare billing, Arizona enrollment
- 33 clinicians in this Medicare group
Safford, AZ 85546
- Reassigned Medicare billing, Arizona enrollment
- 149 clinicians in this Medicare group
Mesa, AZ 85209
- Reassigned Medicare billing, Arizona enrollment
- 19 clinicians in this Medicare group
Mesa, AZ 85202
- Reassigned Medicare billing, Arizona enrollment
- 447 clinicians in this Medicare group
Gallup, NM 87301
- Reassigned Medicare billing, New Mexico enrollment
- Also billed through NPI 1689779860 (New Mexico)
- 179 clinicians in this Medicare group
Lubbock, TX 79401
- Reassigned Medicare billing, Arizona enrollment
- 15 clinicians in this Medicare group
Lubbock, TX 79401
- Reassigned Medicare billing, Arizona enrollment
- 15 clinicians in this Medicare group
Kerrville, TX 78028
- Reassigned Medicare billing, Texas enrollment
- 233 clinicians in this Medicare group
Spring, TX 77389
- Reassigned Medicare billing, Louisiana and Texas enrollments
- 34 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 44
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.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Our Lady Of The Lake Regional Medical Center
Acute Care Hospitals · Baton Rouge, LASt Francis Medical Center
Acute Care Hospitals · Monroe, LARichardson Medical Center
Acute Care Hospitals · Rayville, LAUnc Health Nash
Acute Care Hospitals · Rocky Mount, NCAscension Saint Thomas Hospital
Acute Care Hospitals · Nashville, TNPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 85718 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 18
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 Stephen Johnston's NPI number?
The NPI number for Stephen Johnston is 1730525841. It was assigned to this individual provider in the NPPES registry on May 15, 2013.
Where is Stephen Johnston located?
Stephen Johnston practices at 2492 E River Rd, Tucson, AZ 85718. The listed phone number is (520) 722-8994.
What is Stephen Johnston's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.
Is Stephen Johnston enrolled in Medicare?
Yes. Stephen Johnston 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 organizations bill Medicare for Stephen Johnston's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Johnston reassigns Medicare benefits to 65 organizations: Southern Arizona Rad Associates, LLC (Sierra Vista, AZ), Santa Cruz Radiology L L C (Nogales, AZ), Mt Graham Regional Medical Center Inc (Safford, AZ), Shps PLLC (Mesa, AZ), Sonoran Radiology Ltd (Mesa, AZ) and 60 more organizations, listed in the Medicare section above. Each 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 Stephen Johnston's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Stephen Johnston accept?
Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Baylor Scott and White Health Plan and 9 other insurers list Stephen Johnston as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Stephen Johnston affiliated with any hospitals?
According to CMS data, Stephen Johnston is affiliated with Our Lady Of The Lake Regional Medical Center, St Francis Medical Center, Richardson Medical Center, Unc Health Nash and Ascension Saint Thomas Hospital.
When was this NPI record last updated?
The NPPES record for Stephen Johnston was last updated on February 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Stephen Shepherd Johnston, MD · NPI 1730525841
Diagnostic Radiology physician in Tucson, Arizona. Individual provider, active in the CMS NPPES registry since May 15, 2013.
## Identity
- **NPI:** 1730525841 (Entity type: Individual)
- **Enumerated:** May 15, 2013
- **Primary specialty:** Radiology - Diagnostic Radiology · taxonomy 2085R0202X
- **State license:** R73777 (Arizona)
- **Sole proprietor:** No
## Practice location
- **Address:** 2492 E RIVER RD, Tucson, AZ 85718-9552
- **Phone:** (520) 722-8994
## 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:** 65 organizations under Medicare reassignment (form CMS-855R): Southern Arizona Rad Associates, LLC (NPI 1518344639, Sierra Vista, AZ); Santa Cruz Radiology L L C (NPI 1346291044, Nogales, AZ); Mt Graham Regional Medical Center Inc (NPI 1275588345, Safford, AZ); Shps PLLC (NPI 1497490056, Mesa, AZ); Sonoran Radiology Ltd (NPI 1033745708, Mesa, AZ); and 60 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Arizona College Of Medicine, class of 2013
## Record status
- **NPPES last updated:** February 6, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1730525841) · Data from the CMS NPPES public registry.