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JOHNSTON, SEANM.D., PH.D. NPI 1477581866 Clinician

Diagnostic Radiology · SANTA ANA, CA

Specialty Diagnostic Radiology — from billed Medicare claims
Trained MAYO MEDICAL SCHOOL — medical school, self-reported to CMS
In practice about 28 years since medical school (class of 1998, self-reported to CMS)
Location SANTA ANA, CA · NPPES registered location
Active in data Billed Medicare 2020–2024 (5 consecutive years)
Scale 95 codes billed · 9,441 disclosed services (CY2024 — most recent year in data)
Current groups
member of 9 groups; the volumes below are this clinician's personal volume and are not attributed to any single group

Group affiliation since 2019

20192026
ADVENTIST HEALTH TULARE
2025–2026
VESTA TELEMEDICINE SOLUTIONS PLLC
2025–2026
ADVENTIST HEALTH PHYSICIANS NETWORK
2024–2026
ADVENTIST HEALTH CLEARLAKE HOSPITAL INC.
2023–2026
WILLITS HOSPITAL INC
2023–2026
HANFORD COMMUNITY HOSPITAL
2021–2026
MAWAN SHUAYTO MD PC
2021–2026
REEDLEY COMMUNITY HOSPITAL
2021–2026
RADIOLOGY MEDICAL GROUP OF WMMC
2019–2026
ADVENTIST HEALTH MENDOCINO COAST
2024–2025
UKIAH ADVENTIST HOSPITAL
2024
UKIAH ADVENTIST HOSPITAL
2022
WILLITS HOSPITAL INC
2020
VESTA SOLUTIONS GROUP LLC
2019

The roster archive begins in 2019, so a span starting at 2019 may reach back further. Membership spans only — no volume is attributed to any group here.

NPPES registry · CMS Doctors & Clinicians registry · Medicare Part B physician/supplier claims · NPPES record last updated 2026-05

Year: 2024 · 2023 · 2022  · 2021  · 2020 

Provider overview · all codes · CY2024

The full analytics for this provider

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The billed-volume positioning, practice focus, and economics behind this provider — computed on the same disclosed Medicare Part B data.

This provider's disclosed Medicare payments across all codes were in CY2024. Included with Platform.

  • Payment, service & beneficiary totals — the disclosed scale, all codes
  • Practice profile — focus & reach — top codes by share of services
  • Office vs. facility setting mix — place-of-service code split
  • Volume over five years — discrete yearly counts, no rate
  • Peer positioning — service volume — percentile among specialty peers, cohort & year disclosed
  • Peer positioning — code breadth — how many codes billed, vs peers

Peer positioning shows billed-volume and code-breadth positions among specialty peers, not measures of care (a provider's true volume position can only be higher, never lower). All figures disclosed Medicare Part B fee-for-service; volumes are personal to this NPI, not attributed to any group.

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Procedures billed to Medicare Part B (2024)

Medicare Part B FFS · CY2024 · as published by CMS
CodeDescription Services Beneficiary-episodes Avg charge Avg Medicare payment
A9576 Injection, gadoteridol, (prohance multipack), per ml
71045 X-ray of chest, 1 view
77080 Dxa bone density measurement of hip, pelvis, spine
71046 X-ray of chest, 2 views
70450 Ct scan head or brain without contrast
72148 Mri scan of lower spinal canal without contrast
73502 X-ray of hip, 2-3 views
73030 X-ray of shoulder, minimum of 2 views
70551 Mri scan of brain without contrast
72110 X-ray of lower and sacral spine, minimum of 4 views
71250 Ct scan of chest without contrast
74177 Ct scan of abdomen and pelvis with contrast
73562 X-ray of knee, 3 views
73630 X-ray of foot, minimum of 3 views
76770 Complete ultrasound scan behind abdominal cavity
74018 X-ray of abdomen, 1 view
73130 X-ray of hand, minimum of 3 views
72141 Mri scan of upper spinal canal without contrast
74176 Ct scan of abdomen and pelvis without contrast
93971 Ultrasound study of one arm or leg veins with compression and maneuvers
72100 X-ray of lower and sacral spine, 2-3 views
73564 X-ray of knee, 4 or more views
76000 Imaging guidance for procedure, 60 minutes or less
76700 Complete ultrasound scan of abdomen
72050 X-ray of upper spine, 4-5 views
72070 X-ray of middle spine, 2 views
73221 Mri scan of arm joint without contrast
70498 Ct scan of blood vessels of neck with contrast
76536 Ultrasound scan of head and neck soft tissue
70496 Ct scan of blood vessels of head with contrast
73110 X-ray of wrist, minimum of 3 views
73721 Mri scan of leg joint without contrast
76705 Limited ultrasound scan of abdomen
74178 Ct scan of abdomen and pelvis before and after contrast
70553 Mri scan of brain before and after contrast
71260 Ct scan of chest with contrast
76856 Complete ultrasound scan of pelvis
93970 Ultrasound study of arm or leg veins with compression and maneuvers
72146 Mri scan of middle spinal canal without contrast
73610 X-ray of ankle, minimum of 3 views
78815 Nuclear medicine study from skull base to mid-thigh with ct scan
72131 Ct scan of lower spine without contrast
73590 X-ray of lower leg, 2 views
93880 Ultrasound of both sides of head and neck blood flow
72125 Ct scan of upper spine without contrast
76830 Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina
72040 X-ray of upper spine, 2-3 views
73080 X-ray of elbow, minimum of 3 views
73552 X-ray of thigh bone, minimum 2 views
73560 X-ray of knee, 1-2 views
74181 Mri scan of abdomen without contrast
72170 X-ray of pelvis, 1-2 views
73522 X-ray of both hips, 3-4 views
70544 Mri scan of blood vessels of head without contrast
78306 Nuclear medicine study of bone and/or joint whole body
72158 Mri scan of lower spinal canal before and after contrast
71275 Ct scan of blood vessels of chest with contrast
73060 X-ray of upper arm, minimum of 2 views
74330 Review by radiologist of image from tube placement into bile and pancreatic duct using an endoscope
74183 Mri scan of abdomen before and after contrast
74019 X-ray of abdomen, 2 views
73090 X-ray of forearm, 2 views
73620 X-ray of foot, 2 views
71101 X-ray of ribs on side of body, minimum of 3 views
76870 Ultrasound scan of scrotum
72156 Mri scan of upper spinal canal before and after contrast
76881 Complete ultrasound scan of joint
76604 Ultrasound scan of chest
70486 Ct scan of face without contrast
72072 X-ray of middle spine, 3 views
74170 Ct scan of abdomen before and after contrast
74174 Ct scan of blood vessels of abdomen and pelvis with contrast
76981 Ultrasound scan of organ tissue for measuring elasticity
93925 Ultrasound of leg arteries or artery grafts
93926 Ultrasound of one leg arteries or artery grafts
73120 X-ray of hand, 2 views
72128 Ct scan of middle spine without contrast
76857 Limited ultrasound scan of pelvis
71100 X-ray of ribs on side of body, 2 views
93923 Complete ultrasound study of arm and leg arteries
70480 Ct scan of cranial cavity without contrast
72220 X-ray of sacrum and tailbone, minimum of 2 views
73140 X-ray of finger, minimum of 2 views
73700 Ct scan of leg without contrast
73718 Mri scan of leg without contrast
78227 Nuclear medicine study of liver and bile duct system with use of drugs
70491 Ct scan of soft tissue of neck with contrast
73200 Ct scan of arm without contrast
78264 Nuclear medicine study of stomach to assess emptying
78708 Nuclear medicine study of kidney, blood, flow, and function with drug administration
72192 Ct scan of pelvis without contrast
73070 X-ray of elbow, 2 views
73100 X-ray of wrist, 2 views
72114 X-ray lower and sacral spine, minimum of 6 views
72197 Mri scan of pelvis before and after contrast

These are this provider's own Medicare Part B fee-for-service volumes (CMS public data). CMS suppresses rows with fewer than 11 beneficiaries, so low-volume codes may be missing entirely — absence is not zero. Beneficiary-episodes count CMS's per-setting beneficiary figures, not unique patients. Average charge and average Medicare payment are weighted by service volume across office and facility settings. Volumes on this page are personal to the NPI and are not attributed to any physician group. See Methods & Sources.