CPT code 82784: Immunoglobulins, igA, IgD, IgG, or IgM2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Measures a selected immunoglobulin class in blood to assess antibody levels during evaluation of suspected immune deficiency, infection, or abnormal protein findings.
Medicare pays $9.30 for 82784 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
$9.30
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 82784 covers
This quantitative assay measures one of four antibody classes: IgA, IgD, IgG, or IgM. It is commonly performed on serum by a clinical laboratory and may be ordered when clinicians evaluate suspected antibody deficiency, recurrent infections, or abnormal protein findings. The result reports the concentration of the selected immunoglobulin class; it is not a test of antigen-specific antibody response or an IgG subclass measurement.
Report the code separately for each of the listed classes measured, with the medical record and claim identifying the tests performed. Medicare pays the assay only through the CLFS. The 2026 national CLFS amount is $9.30, unchanged since 2020; one amount applies across states and localities, without an office-versus-facility difference. The physician fee schedule classifies the test as payable only from 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 82784
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 82784. 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 82784 with status X (excluded by statute), so the test itself is paid only from the CLFS.
82784 on the lab fee schedule since 2020
82784 · CLFS 2026 Q4 (current)
$9.30
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.
82784 compared with similar tests
- 82785IgE testTotal IgE$16.46
- 82785 measures IgE. Use 82784 for IgA, IgD, IgG, or IgM.
- 82787IgG subclassesEach subclass$8.02
- 82787 measures a specified IgG subclass. Code 82784 measures total IgG or another listed immunoglobulin class.
- 84165Protein electrophoresisSerum fractionation and quantitation$10.74
- 84165 separates serum proteins by electrophoresis; 82784 measures the concentration of a selected immunoglobulin class.
- 86334ImmunofixationSerum specimen$22.34
- 86334 uses immunofixation to characterize a protein, while 82784 quantifies a selected immunoglobulin class.
82784 billing questions
How many units should be reported when several immunoglobulin classes are measured?
Report the assay separately for each of IgA, IgD, IgG, or IgM measured. The number reported should match the classes tested and documented.
When should 82784 be chosen instead of 82785?
Use 82784 for IgA, IgD, IgG, or IgM. Code 82785 is for measurement of IgE.
Does this code measure IgG subclasses?
No. Code 82784 measures total IgG or another listed immunoglobulin class; 82787 identifies an IgG subclass assay.
How does Medicare pay for this test?
Medicare pays 82784 through the CLFS, with one national amount that applies across localities and settings. The physician fee schedule classifies it as payable only from the CLFS.
Is the assay commonly paired with protein electrophoresis?
It may be ordered alongside serum protein electrophoresis or immunofixation when clinicians assess abnormal protein findings. These tests evaluate different aspects of the protein profile.
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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