CPT 87804: Influenza Virus Antigen, Single
Laboratory immunoassay testing for detection of influenza virus antigen (Type A or B) in respiratory specimen including nasopharyngeal swab, nasal aspirate, or throat swab.
Why CPT 87804 Claims Get Denied
Claims billed under CPT 87804 are frequently denied or downcoded for the following reasons. Understanding these patterns helps your practice reduce denial rates and recover revenue faster.
Testing outside appropriate time frame
Lack of respiratory symptoms documentation
Seasonal appropriateness questioned
Duplicate testing within short interval
Billing Tips for CPT 87804
Document respiratory symptoms supporting influenza testing. Note timing (typically first 3-4 days of illness for best accuracy). Include specimen type collected. Document clinical impact of testing on treatment decisions.
Documentation Requirements
To support a clean claim for CPT 87804, your clinical documentation should include:
Respiratory symptoms documented
Symptom onset date
Specimen type collected
Test results
Clinical interpretation
Treatment plan if positive
Antiviral therapy status
Common Modifiers for CPT 87804
Reduce CPT 87804 Denials by 60%
RediClaim's pre-submission scrubber catches documentation gaps and coding errors before you submit, while the appeal generator handles denials that slip through.