CPT code 89051: Body fluid count, with cell identification2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Reports a cell count with cell identification for a nonblood body fluid, such as cerebrospinal or joint fluid, when a differential is performed.
Medicare pays $5.60 for 89051 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
$5.60
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 89051 covers
This laboratory test counts cells and identifies cell types in a nonblood body fluid. Common specimens include cerebrospinal fluid and synovial (joint) fluid; other miscellaneous body fluids may also be evaluated. A clinical laboratory performs the analysis when clinicians are assessing conditions such as infection or inflammation. The fluid source and cell identification results help distinguish this service from a count without a differential.
Report 89051 for the body fluid cell count with cell identification; 89050 is the related code for a count without a differential. Medicare pays the test only through the Clinical Laboratory Fee Schedule (CLFS). The 2026 national CLFS amount is $5.60, unchanged from 2020 through 2026. That amount applies across states and localities, with no office or facility payment difference. The physician fee schedule excludes this test.
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 89051
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 89051. 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 89051 with status X (excluded by statute), so the test itself is paid only from the CLFS.
89051 on the lab fee schedule since 2020
89051 · CLFS 2026 Q4 (current)
$5.60
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.
89051 compared with similar tests
- 89050Fluid cell countWithout differential$4.72
- Choose 89051 when the body fluid count includes cell identification; 89050 describes the count without a differential.
- 89060Crystal examFluid or tissue microscopy$7.33
- 89060 reports crystal examination, commonly on synovial fluid. It does not represent the cell count and cell identification reported with 89051.
- 89055Stool leukocytesStool white-cell estimate$4.27
- 89055 evaluates leukocytes in fecal material. Use 89051 for cell counting and identification in a nonblood body fluid.
89051 billing questions
When should 89051 be chosen instead of 89050?
Use 89051 when the body fluid cell count includes identification of cell types. Use 89050 when the count is performed without a differential.
Which specimens are reported with 89051?
The code is for nonblood body fluids, including cerebrospinal and synovial fluid. Document the fluid source and the cell identification performed.
How does 89051 differ from synovial fluid crystal analysis?
89051 reports a body fluid cell count with cell identification. Code 89060 describes synovial fluid crystal examination.
Does Medicare pay 89051 under the physician fee schedule?
No. Medicare pays this test only through the CLFS, using one national amount across localities and care settings.
Should modifier 26 be used with 89051?
No. Medicare pays 89051 only through the CLFS; the physician fee schedule excludes it.
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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