CPT code 84302: Sweat sodium, quantitative sweat measurement2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Measures sodium in collected sweat, typically as part of sweat electrolyte testing during evaluation of suspected cystic fibrosis or related concerns.
Medicare pays $4.86 for 84302 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
$4.86
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 84302 covers
84302 reports laboratory measurement of sodium concentration in a collected sweat specimen. It is used in sweat electrolyte testing, often alongside sweat chloride, during evaluation for cystic fibrosis. Sodium and chloride are separate analytes, so each assay reported must correspond to a measurement performed. The laboratory reports the sodium result for clinician interpretation with the patient's other findings.
Report 84302 for sweat sodium testing; report 89230 when diagnostic sweat collection is performed and separately reported. Medicare pays this laboratory service under the CLFS rather than the physician fee schedule. The 2026 national CLFS amount is $4.86, unchanged from 2020 through 2026. One national amount applies across states and localities, without geographic or office-versus-facility adjustment.
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 84302
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 84302. 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 84302 with status X (excluded by statute), so the test itself is paid only from the CLFS.
84302 on the lab fee schedule since 2020
84302 · CLFS 2026 Q4 (current)
$4.86
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.
84302 compared with similar tests
- 84300Urine sodiumUrine specimen$5.06
- Use 84302 for sweat sodium and 84300 for urine sodium. The specimen determines which assay code applies.
- 82438Chloride assayOther fluid source$5.00
- 82438 is a chloride assay for another source, not a sodium assay. Sweat sodium and sweat chloride are separate measurements.
84302 billing questions
How is 84302 different from 84300?
84302 is for sodium measured in sweat; 84300 is for sodium measured in urine. Select the code that matches the specimen tested.
Can sweat collection be reported separately?
Code 89230 describes collection of sweat for diagnostic testing and may be reported when that collection service is performed.
Is sweat chloride the same assay as sweat sodium?
No. Sweat sodium and sweat chloride are different analytes; report the code for each assay performed.
How does Medicare pay for 84302?
Medicare pays 84302 under the CLFS using one national amount across localities, with no office-versus-facility payment difference.
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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