CPT code 87337: Entamoeba antigen, group antigen2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Immunoassay detection of Entamoeba histolytica group antigen supports laboratory evaluation of suspected intestinal amebiasis.
Medicare pays $11.98 for 87337 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
$11.98
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 87337 covers
This immunoassay detects antigen from the Entamoeba histolytica group. It is used in laboratory evaluation of suspected intestinal amebiasis, commonly when gastrointestinal symptoms prompt testing for an infectious cause. Stool is the typical specimen for this testing. The result is qualitative or semiquantitative, depending on the assay. Code selection distinguishes group-antigen detection from the separate Entamoeba histolytica/dispar antigen assay.
Report 87337 for the group antigen assay performed; the group designation does not represent separate assays for each organism. Medicare pays the test through the CLFS only. The 2026 national CLFS amount is $11.98, unchanged since 2020, and the same national payment applies across states and localities, with no office-versus-facility adjustment. The test 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 87337
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 87337. 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 87337 with status X (excluded by statute), so the test itself is paid only from the CLFS.
87337 on the lab fee schedule since 2020
87337 · CLFS 2026 Q4 (current)
$11.98
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.
87337 compared with similar tests
- 87336Entamoeba antigenHistolytica/dispar group$16.00
- Use 87337 for the Entamoeba histolytica group antigen assay; 87336 identifies the histolytica/dispar antigen assay. Match the code to the assay performed.
- 87328Cryptosporidium antigenImmunoassay detection$13.82
- 87328 detects Cryptosporidium antigen, not Entamoeba antigen. These codes represent separate organism-specific stool assays.
- 87329Giardia antigenImmunoassay detection$11.98
- 87329 detects Giardia antigen. Use 87337 for the Entamoeba histolytica group antigen assay.
87337 billing questions
How does 87337 differ from 87336?
87337 identifies an Entamoeba histolytica group antigen assay. Code 87336 identifies an Entamoeba histolytica/dispar antigen assay; select the code matching the assay performed.
What specimen is generally tested?
Stool is the typical specimen for evaluating suspected intestinal amebiasis with this antigen assay.
Does the group designation mean each organism is a separate test?
No. The code identifies an assay for the Entamoeba histolytica group, rather than separate assays for each organism represented by the group.
Can this be reported with Giardia or Cryptosporidium antigen testing?
Yes, when those distinct stool antigen assays are also performed as part of the patient's evaluation. Each code represents a different organism-specific test.
How does Medicare pay for 87337?
Medicare pays it through the CLFS at one national amount, with the same payment across localities and office or facility settings. It is excluded from the physician fee schedule.
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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