CPT code 85675: Thrombin time, titer for fibrinogen screening2026 Medicare lab fee · Clinical Laboratory Fee Schedule
Thrombin-time titer testing for fibrinogen screening is reported under 85675, distinct from routine plasma thrombin-time testing coded 85670.
Medicare pays $6.85 for 85675 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
$6.85
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 85675 covers
85675 identifies a thrombin-time titer test used for fibrinogen screening. It is distinct from the plasma thrombin-time test reported with 85670. Prothrombin-time testing (85610) and the reptilase test (85635) are also separate tests, not alternate names for the thrombin-time titer. Report 85675 when the laboratory service performed is the thrombin-time titer fibrinogen-screening test.
Medicare pays 85675 only through the CLFS. CMS sets one national amount for all states and localities, without geographic adjustment or an office-versus-facility difference. The 2026 national CLFS amount is $6.85, unchanged from 2020 through 2025. The test is excluded from the physician fee schedule by statute.
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 85675
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 85675. 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 85675 with status X (excluded by statute), so the test itself is paid only from the CLFS.
85675 on the lab fee schedule since 2020
85675 · CLFS 2026 Q4 (current)
$6.85
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.
85675 compared with similar tests
- 85670Thrombin timeFibrinogen screening$5.77
- 85675 identifies the thrombin-time titer test for fibrinogen screening; 85670 identifies the plasma thrombin-time test.
- 85635Reptilase testFibrin-forming step$9.85
- 85635 identifies a reptilase test, while 85675 identifies a thrombin-time titer test.
- 85610Prothrombin timeRoutine coagulation test$4.29
- 85610 identifies prothrombin-time testing; 85675 identifies a thrombin-time titer test.
85675 billing questions
How does 85675 differ from 85670?
85675 identifies the thrombin-time titer test used for fibrinogen screening. Code 85670 identifies the plasma thrombin-time test.
Is 85675 a prothrombin-time test?
No. Prothrombin-time testing is identified by 85610; 85675 is the thrombin-time titer test for fibrinogen screening.
How does 85675 differ from the reptilase test?
85635 identifies the reptilase test. 85675 identifies a thrombin-time titer test.
How does Medicare pay for 85675?
Medicare pays 85675 through the CLFS at one national amount, without geographic or office-versus-facility adjustment.
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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