CPT code 86337: Insulin antibodies, antibodies directed at insulin2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Reports a laboratory measurement of antibodies directed against insulin, distinguishing this assay from tests measuring insulin concentration or antibodies to islet cells.
Medicare pays $21.41 for 86337 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
$21.41
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 7 sections
What 86337 covers
86337 identifies measurement of antibodies directed against insulin. Insulin is the target being measured; this is distinct from measuring insulin concentration or testing for antibodies against islet cells. The service is a laboratory assay, and the reported result concerns insulin antibodies rather than another antibody target.
Report 86337 for the insulin-antibody measurement performed. Medicare pays it under the CLFS at one national amount per code in every state and locality, with no geographic adjustment and no office-versus-facility difference. The 2026 national CLFS amount is $21.41, unchanged in each listed year from 2020 through 2026. The test is paid through the CLFS only, 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 86337
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 86337. 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 86337 with status X (excluded by statute), so the test itself is paid only from the CLFS.
86337 on the lab fee schedule since 2020
86337 · CLFS 2026 Q4 (current)
$21.41
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.
86337 compared with similar tests
- 86341Islet cell antibodyPancreatic islet antibodies$23.57
- Use 86337 for antibodies directed against insulin; use 86341 for antibodies directed against islet cells.
- 83525Insulin assayTotal insulin$11.43
- Code 83525 measures insulin concentration, while 86337 measures antibodies directed against insulin.
- 84681C-peptideEndogenous insulin marker$20.81
- Code 84681 measures C-peptide, not insulin antibodies. Select the code that matches the laboratory analyte.
86337 billing questions
How does 86337 differ from islet cell antibody testing?
Code 86337 measures antibodies directed against insulin. Code 86341 measures antibodies directed against islet cells.
Is 86337 an insulin concentration test?
No. It measures insulin antibodies; code 83525 measures insulin concentration.
What should documentation identify?
Documentation should identify the test as measuring antibodies directed against insulin, rather than insulin concentration or antibodies to another target.
How does Medicare pay for 86337?
Medicare pays it under the CLFS at one national amount per code across localities, with no office-versus-facility 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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