CPT code 84392: Urine sulfate, sulfate level2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Measures sulfate in urine, commonly as part of a metabolic evaluation for recurrent kidney stones and urinary stone-forming risk.
Medicare pays $5.49 for 84392 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
$5.49
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 84392 covers
This assay measures sulfate in a urine specimen. It is commonly ordered as part of a metabolic evaluation for recurrent nephrolithiasis, where urinary chemistry helps characterize stone-forming risk. Urinary sulfate also contributes to assessment of dietary protein intake in stone-risk evaluation. A clinical laboratory performs the assay and reports the result to the ordering clinician, often a urologist or nephrologist.
Report 84392 for the urine sulfate assay performed, rather than substituting a code for a different urine analyte. Medicare pays it under the CLFS at one national amount, with no locality or office-versus-facility adjustment. The 2026 national CLFS amount is $5.49, unchanged since 2020. The code is paid only through the CLFS and is excluded from 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 84392
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 84392. 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 84392 with status X (excluded by statute), so the test itself is paid only from the CLFS.
84392 on the lab fee schedule since 2020
84392 · CLFS 2026 Q4 (current)
$5.49
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.
84392 compared with similar tests
- 84300Urine sodiumUrine specimen$5.06
- 84392 measures urine sulfate; 84300 measures urine sodium. Select the code for the analyte the laboratory assayed.
- 83945Oxalate testOxalate-specific assay$14.45
- 83945 is for urine oxalate, a separate analyte that may be evaluated in kidney-stone workups. Use 84392 only for urine sulfate.
- 82340Urine calciumTimed quantitative measurement$6.03
- 82340 reports a urine calcium assay, not sulfate. These tests may be ordered together, but each represents a distinct measurement.
84392 billing questions
When should 84392 be chosen over the urine sodium assay?
Use 84392 when the test measures sulfate in urine. Use 84300 when the measured urine analyte is sodium; the two codes represent different assays.
Is 84392 reported for a urine stone-risk evaluation?
It may be reported when the evaluation includes a urine sulfate assay. Report the code for the sulfate assay performed.
Does Medicare pay 84392 under the CLFS or physician fee schedule?
Medicare pays 84392 under the CLFS. The code is excluded from the physician fee schedule.
Is 84392 limited to kidney-stone evaluations?
The code identifies a urine sulfate assay. It may be reported when that assay is performed as part of a stone-risk evaluation.
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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