CPT code 84066: Acid phosphatase, prostatic form2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Laboratory assay measuring prostatic acid phosphatase, reported when the prostatic enzyme rather than general acid phosphatase is tested.
Medicare pays $9.66 for 84066 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
$9.66
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 8 sections
What 84066 covers
84066 identifies a laboratory assay that measures prostatic acid phosphatase. It is distinct from the general acid phosphatase assay identified by 84060; code selection follows the assay performed. This code describes the laboratory measurement of the prostatic enzyme.
Report 84066 for the prostatic assay and 84060 for the general acid phosphatase assay. Medicare pays 84066 under the CLFS at one national amount in every state and locality, without geographic adjustment or an office-versus-facility difference. The 2026 national CLFS amount is $9.66, unchanged since 2020. The test is paid through the CLFS rather than the physician fee schedule.
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 84066
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 84066. 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 84066 with status X (excluded by statute), so the test itself is paid only from the CLFS.
84066 on the lab fee schedule since 2020
84066 · CLFS 2026 Q4 (current)
$9.66
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.
84066 compared with similar tests
- 84060Acid phosphataseTotal enzyme activity$7.64
- Choose 84066 for the prostatic acid phosphatase assay; 84060 identifies an acid phosphatase assay without the prostatic specification.
- 84153Total PSA$18.39
- 84153 measures prostate-specific antigen, not prostatic acid phosphatase. Select the code for the analyte tested.
84066 billing questions
What does 84066 measure?
It reports a laboratory assay measuring prostatic acid phosphatase.
How does 84066 differ from 84060?
84066 identifies the prostatic acid phosphatase assay; 84060 identifies an acid phosphatase assay without that prostatic specification.
How does Medicare pay for 84066?
Medicare pays it under the CLFS at one national amount across localities, with no office-versus-facility difference.
Does Medicare pay 84066 through the physician fee schedule?
No. The test is paid through the CLFS.
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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