CPT code 82330: Calcium test, ionized calcium2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Measures ionized, biologically active calcium in blood when clinicians need to assess calcium status beyond a total calcium measurement.
Medicare pays $13.68 for 82330 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
$13.68
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
- QW · CLIA-waived test
- $13.68
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 82330 covers
This blood assay measures ionized calcium, the portion circulating in a free, biologically active form. Clinicians may order it when assessing calcium disorders or when changes in albumin binding or acid-base status could make total calcium less representative of physiologically available calcium. Hospital and independent laboratories perform the assay for patients in inpatient, outpatient, and acute-care settings.
Report 82330 for the ionized calcium assay; it is distinct from a total calcium measurement and from urinary calcium testing. CMS also lists a CLIA-waived version reported with modifier QW for sites holding a CLIA certificate of waiver. Medicare pays the test only under the CLFS: the 2026 national amount is $13.68, unchanged since 2020. The same amount applies in every locality, without a geographic or office-versus-facility adjustment. The code is excluded from the physician fee schedule, so payment is through the CLFS.
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 82330
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 82330. 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 82330 with status X (excluded by statute), so the test itself is paid only from the CLFS.
CLIA-waived version (QW)
CMS also lists 82330 with modifier QW, the version labs holding a CLIA certificate of waiver bill. It pays $13.68.
82330 on the lab fee schedule since 2020
82330 · CLFS 2026 Q4 (current)
$13.68
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.
82330 compared with similar tests
- 82310Total calciumTotal, serum or plasma$5.16
- Choose 82330 for ionized calcium and 82310 for total calcium. The assays measure different calcium fractions.
- 82340Urine calciumTimed quantitative measurement$6.03
- 82340 measures calcium in urine; 82330 measures ionized calcium in blood.
- 80047Basic metabolic panelIonized calcium$13.73
- 80047 is a multi-test basic metabolic panel that includes ionized calcium. Use the panel code when that panel is performed, rather than separately reporting its calcium component.
82330 billing questions
How does 82330 differ from 82310?
82330 measures ionized calcium, the free, biologically active fraction. 82310 measures total calcium.
When should modifier QW be reported?
Use QW for the CLIA-waived version when the testing site holds a CLIA certificate of waiver.
Can 82330 be separately reported with 80047?
80047 is the basic metabolic panel that includes ionized calcium. Do not separately report 82330 for the ionized calcium included in that panel.
How does Medicare pay for 82330?
Medicare pays it under the CLFS at one national rate, which is the same across localities and settings. The physician fee schedule excludes this test.
Is 82330 the code for calcium in urine?
No. 82330 is for ionized calcium measured in blood; 82340 is the assay for calcium in urine.
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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