CPT code 84590: Vitamin A2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Measures vitamin A for laboratory reporting when a clinician orders assessment of the patient's vitamin A status.
Medicare pays $11.61 for 84590 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
$11.61
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 84590 covers
Code 84590 identifies a laboratory assay that measures vitamin A. It is selected when the test performed specifically measures vitamin A, rather than a vitamin assay reported as not otherwise specified or an assay for vitamin K. The laboratory reports the vitamin A result for clinical assessment. The code identifies the analyte being measured; it is not a general code for vitamin testing.
Report 84590 for the vitamin A assay performed. Medicare pays the test under the CLFS at one national amount that applies in every state and locality, without geographic adjustment or an office-versus-facility difference. The 2026 national CLFS amount is $11.61, unchanged from 2020 through 2026. Medicare payment for this test comes only from the CLFS, with no separate physician fee schedule payment.
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 84590
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 84590. 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 84590 with status X (excluded by statute), so the test itself is paid only from the CLFS.
84590 on the lab fee schedule since 2020
84590 · CLFS 2026 Q4 (current)
$11.61
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.
84590 compared with similar tests
- 84591Vitamin assayVitamin not otherwise specified$17.06
- 84590 identifies a vitamin A assay. Use 84591 when the vitamin assayed is not otherwise specified.
- 84597Vitamin K assay$13.72
- 84597 is for vitamin K. Report 84590 when the laboratory measures vitamin A.
- 84446Vitamin EAlpha-tocopherol level$14.18
- 84446 is the vitamin E assay; 84590 is the vitamin A assay.
84590 billing questions
When should 84590 be reported instead of 84591?
Use 84590 when the assay measures vitamin A. Code 84591 describes an assay for a vitamin not otherwise specified.
How does 84590 differ from the vitamin K assay?
84590 measures vitamin A; 84597 measures vitamin K. Select the code for the specific vitamin assayed.
How is Medicare payment determined for 84590?
Medicare pays 84590 under the CLFS at one national amount, with no geographic or office-versus-facility adjustment. The test is paid only from the CLFS.
Is there a separate physician fee schedule payment for 84590?
No. The test is paid only from the CLFS and is excluded from the physician fee schedule by statute.
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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