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CHASTAIN, COLBYM.D. NPI 1922056217 Clinician

Diagnostic Radiology · GAINESVILLE, GA

Specialty Diagnostic Radiology — from billed Medicare claims
Trained MEDICAL COLLEGE OF GEORGIA SCHOOL OF MEDICINE — medical school, self-reported to CMS
In practice about 28 years since medical school (class of 1998, self-reported to CMS)
Location GAINESVILLE, GA · NPPES registered location
Active in data Billed Medicare 2020–2024 (5 consecutive years)
Scale 64 codes billed · 4,044 disclosed services (CY2024 — most recent year in data)
Current groups
member of 2 groups; the volumes below are this clinician's personal volume and are not attributed to any single group

Group affiliation since 2019

20192026
ATLANTIC RADIOLOGY ASSOCIATES LLC
2026
GAINESVILLE RADIOLOGY GROUP PC
2019–2026

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 2025-09

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
71045 X-ray of chest, 1 view
77063 Screening 3d breast mammography
77067 Screening mammography
74177 Ct scan of abdomen and pelvis with contrast
70450 Ct scan head or brain without contrast
78815 Nuclear medicine study from skull base to mid-thigh with ct scan
71250 Ct scan of chest without contrast
74176 Ct scan of abdomen and pelvis without contrast
72148 Mri scan of lower spinal canal without contrast
71260 Ct scan of chest with contrast
74018 X-ray of abdomen, 1 view
72141 Mri scan of upper spinal canal without contrast
71046 X-ray of chest, 2 views
72125 Ct scan of upper spine without contrast
71275 Ct scan of blood vessels of chest with contrast
73721 Mri scan of leg joint without contrast
76536 Ultrasound scan of head and neck soft tissue
72146 Mri scan of middle spinal canal without contrast
G0279 Diagnostic digital breast tomosynthesis, unilateral or bilateral (list separately in addition to 77065 or 77066)
72131 Ct scan of lower spine without contrast
70498 Ct scan of blood vessels of neck with contrast
76770 Complete ultrasound scan behind abdominal cavity
70496 Ct scan of blood vessels of head with contrast
72100 X-ray of lower and sacral spine, 2-3 views
76642 Limited ultrasound scan of 1 breast
70551 Mri scan of brain without contrast
77065 Diagnostic mammography of 1 breast
76705 Limited ultrasound scan of abdomen
73200 Ct scan of arm without contrast
74183 Mri scan of abdomen before and after contrast
73221 Mri scan of arm joint without contrast
73030 X-ray of shoulder, minimum of 2 views
72170 X-ray of pelvis, 1-2 views
73700 Ct scan of leg without contrast
73502 X-ray of hip, 2-3 views
73564 X-ray of knee, 4 or more views
74230 Imaging for evaluation of swallowing function
77066 Diagnostic mammography of both breasts
73630 X-ray of foot, minimum of 3 views
78306 Nuclear medicine study of bone and/or joint whole body
73552 X-ray of thigh bone, minimum 2 views
78816 Nuclear medicine study whole body with ct scan
70486 Ct scan of face without contrast
73130 X-ray of hand, minimum of 3 views
74174 Ct scan of blood vessels of abdomen and pelvis with contrast
78708 Nuclear medicine study of kidney, blood, flow, and function with drug administration
78830 Nuclear medicine study, spect imaging with concurrent ct scan, 1 area or single acquisition, single day imaging
78580 Nuclear medicine study of lung circulation
72110 X-ray of lower and sacral spine, minimum of 4 views
73610 X-ray of ankle, minimum of 3 views
74178 Ct scan of abdomen and pelvis before and after contrast
71101 X-ray of ribs on side of body, minimum of 3 views
77080 Dxa bone density measurement of hip, pelvis, spine
73590 X-ray of lower leg, 2 views
74221 Double contrast x-ray of esophagus
70553 Mri scan of brain before and after contrast
73110 X-ray of wrist, minimum of 3 views
72040 X-ray of upper spine, 2-3 views
73560 X-ray of knee, 1-2 views
72192 Ct scan of pelvis without contrast
73718 Mri scan of leg without contrast
71271 Low dose ct scan of chest for lung cancer screening
72128 Ct scan of middle spine without contrast
78072 Nuclear medicine study of parathyroid with spect and ct scan

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.