CPT code 83919: Organic acids, qualitative, each specimen2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Qualitative organic acids analysis assesses each specimen for organic acid findings, often as part of evaluating suspected inherited metabolic disease or unexplained metabolic abnormalities.
Medicare pays $16.45 for 83919 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
$16.45
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 83919 covers
This laboratory analysis looks for organic acids in a specimen and reports the findings qualitatively. Urine is a common specimen in the evaluation of suspected inherited metabolic disorders, including organic acid disorders, or unexplained metabolic abnormalities. Clinical chemistry or biochemical genetics laboratories typically perform the analysis after a clinician orders it as part of a diagnostic workup.
Report 83919 for each specimen analyzed. It represents qualitative analysis, not quantitation of total organic acids or measurement of one specified organic acid. Medicare pays the test only through the Clinical Laboratory Fee Schedule. The 2026 national CLFS amount is $16.45, unchanged from 2020 through 2026. The amount is the same across states and localities, with no office or facility difference. The code 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 83919
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 83919. 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 83919 with status X (excluded by statute), so the test itself is paid only from the CLFS.
83919 on the lab fee schedule since 2020
83919 · CLFS 2026 Q4 (current)
$16.45
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.
83919 compared with similar tests
- 83918Organic acidsTotal quantitative$23.60
- Choose 83919 for qualitative findings on each specimen; choose 83918 when total organic acids are measured quantitatively.
- 83921Organic acidSingle analyte, quantitative$21.21
- 83919 is qualitative organic acids analysis. 83921 measures one specified organic acid quantitatively.
- 82139Amino acidsSix or more, quantitative$16.87
- 82139 analyzes amino acids, not organic acids. The tests may be ordered together in a metabolic workup, but represent different analyte groups.
83919 billing questions
When should 83919 be reported instead of 83918?
Use 83919 for qualitative organic acids analysis of each specimen. Code 83918 represents quantitative measurement of total organic acids.
How are units counted?
Report one unit for each specimen analyzed. The code is specific to qualitative analysis.
How does 83919 differ from 83921?
Code 83919 reports qualitative organic acids analysis. Code 83921 is used for quantitative measurement of a single organic acid.
How does Medicare pay for this test?
Medicare pays 83919 through the CLFS at one national amount, the same in every locality and setting. It is excluded from the physician fee schedule.
Can organic acids analysis be part of a broader metabolic workup?
Yes. It may be ordered alongside tests such as amino acid or acylcarnitine analysis when evaluating a suspected inherited metabolic disorder.
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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