CPT code 84577: Stool urobilinogen, quantitative stool specimen2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Quantitative measurement of urobilinogen in a fecal specimen, reported for laboratory testing of stool rather than urine.
Medicare pays $16.80 for 84577 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
$16.80
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 84577 covers
Code 84577 identifies quantitative measurement of urobilinogen in feces. Urobilinogen is produced during bilirubin metabolism; this assay analyzes a stool specimen, not urine. A clinical laboratory reports the result as a fecal urobilinogen test. Urine urobilinogen testing belongs to separate urine-specific codes, including 84578, 84580, and 84583.
Report 84577 for quantitative stool testing and select a urine-specific code when the specimen is urine. Medicare pays this test under the CLFS at one national amount applicable in every state and locality, without geographic adjustment or an office/facility difference. The 2026 national CLFS amount is $16.80, unchanged from 2020 through 2026. Medicare pays it only through the CLFS; it 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 84577
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 84577. 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 84577 with status X (excluded by statute), so the test itself is paid only from the CLFS.
84577 on the lab fee schedule since 2020
84577 · CLFS 2026 Q4 (current)
$16.80
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.
84577 compared with similar tests
- 84578Urine urobilinogenQualitative measurement$4.47
- 84578 is for urine urobilinogen testing. Use 84577 when the laboratory tests a stool specimen.
- 84580Urine urobilinogenTimed urine collection$9.55
- 84580 identifies a urine urobilinogen assay; 84577 identifies the fecal assay.
- 84583Urine urobilinogenSemiquantitative assay$6.05
- 84583 is a urine urobilinogen assay. Choose 84577 for testing urobilinogen in feces.
84577 billing questions
Which specimen supports reporting 84577?
Use 84577 for quantitative urobilinogen testing on a stool specimen. Urine urobilinogen testing has separate codes.
How does 84577 differ from 84578?
84577 is for a fecal specimen; 84578 is a urine urobilinogen test. Select based on the specimen tested.
Is 84577 reported for quantitative testing?
Yes. This code identifies quantitative urobilinogen testing in feces.
How does Medicare pay for 84577?
Medicare pays it through the CLFS at one national amount, with no locality or office-versus-facility adjustment. Payment is through the CLFS only.
Should 84577 be used for a urine assay?
No. Use a urine-specific urobilinogen code when the tested specimen is urine; 84577 identifies the fecal assay.
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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