CPT code 84255: Selenium test2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Measures selenium concentration for laboratory reporting of a patient's selenium level during assessment of selenium status.
Medicare pays $25.53 for 84255 under the 2026 Clinical Laboratory Fee Schedule: one national amount, the same in every state and setting.
Medicare lab fee · CLFS 2026 Q4
National CLFS amount
$25.53
In effect since Jan 1, 2026. The same amount in every state, payment locality and setting.
- Geographic adjustment
- None
- Office vs facility
- Same
- Since 2020
- Unchanged
- CMS updates
- Quarterly
Medicare pays the lesser of the lab’s charge and this amount. Patients usually owe no Part B deductible or coinsurance for covered clinical lab tests.
On this page 7 sections
What 84255 covers
CPT 84255 reports a laboratory measurement of selenium concentration. The result is a selenium level for assessment of selenium status; it is not a measure of selenium intake or the amount of a supplement. A clinical laboratory performs and reports the assay. This code identifies measurement of selenium, distinguishing it from assays that measure other analytes, including vitamin B6 and vitamin B2.
Report 84255 for the selenium assay performed. Medicare pays the test only through the CLFS. The 2026 national CLFS amount is $25.53, unchanged since 2020. The same national amount applies in every state and locality, with no geographic or office-versus-facility adjustment. The test is excluded from the physician fee schedule by statute.
This summary was written with AI assistance from CMS Clinical Laboratory Fee Schedule data. Amounts on this page come directly from CMS files.
How Medicare pays 84255
Clinical lab tests aren’t priced like physician services. They’re paid from their own fee schedule, with its own rules. See the whole lab fee schedule.
One national amount
CMS sets a single Clinical Laboratory Fee Schedule amount for 84255. There’s no geographic (GPCI) adjustment, so it pays the same in every state and payment locality.
No office or facility rate
Lab tests aren’t built from relative value units, so there’s no office and facility split: the place of service doesn’t change the CLFS amount.
Updated every quarter
CMS republishes the CLFS each quarter. New tests, often proprietary laboratory analyses (PLA codes), join during the year; existing amounts are updated each January.
Excluded from the physician fee schedule
The physician fee schedule lists 84255 with status X (excluded by statute), so the test itself is paid only from the CLFS.
84255 on the lab fee schedule since 2020
84255 · CLFS 2026 Q4 (current)
$25.53
Unchanged since Jan 1, 2020
27 quarterly CLFS releases on file, first CLFS 2020 Q1. A code missing from a quarter wasn’t on that release.
84255 compared with similar tests
84255 billing questions
What does 84255 measure?
It reports a laboratory measurement of selenium concentration, resulting in a selenium level.
How does 84255 differ from 84207 and 84252?
84255 measures selenium; 84207 measures vitamin B6, and 84252 measures vitamin B2. Select the code for the analyte measured.
Which Medicare fee schedule pays for 84255?
Medicare pays 84255 through the CLFS only.
Does CLFS payment for 84255 vary by locality or setting?
No. One national amount applies in every state and locality, without an office-versus-facility adjustment.
Where this amount comes from
FeeBase reads lab amounts directly from the CMS Clinical Laboratory Fee Schedule file for the quarter: one row per code, with its payment indicator and national amount. Contractor-priced tests are labeled, never given a made-up amount. Amounts are Medicare payment limits, not a patient’s bill or a commercial rate.
CMS CLFS 2026 Q4 · effective Oct 1, 2026 through the day before Jan 1, 2027
Show the CMS file line behind this amount
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