CPT® Code 86160 is used to report quantitative measurement of complement proteins (antigens) in blood, typically including components such as C3, C4, or other complement factors. Complement testing is commonly used to evaluate immune system activity, particularly in autoimmune and inflammatory conditions.
This code is reported per component tested, meaning each complement factor measured (e.g., C3, C4) may be billed separately.
Key Facts About CPT® 86160
- Service type: Laboratory test (immunology)
- Test: Complement antigen (quantitative), each component
- Specimen type: Serum or plasma
- Test purpose: Assess immune function and complement system activity
- Provider type: Laboratories, physicians, and qualified healthcare professionals
Common clinical indications:
- Evaluation of autoimmune diseases (e.g., lupus)
- Monitoring inflammatory or immune-mediated conditions
- Assessment of complement deficiencies
- Workup of recurrent infections or immune dysfunction
- Nephrology and rheumatology evaluations
When to Use CPT® 86160
CPT 86160 is appropriate when:
- Measuring specific complement components (e.g., C3, C4)
- Evaluating suspected autoimmune or immune-mediated disease
- Monitoring disease activity in conditions like systemic lupus erythematosus (SLE)
- Investigating complement deficiencies or dysfunction
Examples:
- Ordering C3 and C4 levels in a patient with suspected lupus
- Monitoring complement levels in autoimmune disease management
- Evaluating unexplained immune dysfunction or recurrent infections
- Assessing complement activity in renal disease workups
Documentation Requirements
To support CPT 86160 billing, documentation should include:
- Patient identifiers and date of service
- Clinical indication for testing
- Specific complement component(s) tested (e.g., C3, C4)
- Specimen type (serum or plasma)
- Test results and date reported
- Ordering provider information
Clear documentation should support each component billed and medical necessity.
Reimbursement and Coding Considerations
- CPT 86160 is reported per component tested
- Generally covered when medically necessary, especially for autoimmune evaluations
- Diagnosis coding should support immune, inflammatory, or renal conditions
- Often performed alongside other immunologic tests (e.g., ANA, ESR, CRP)
- Frequency of testing may be limited based on payer policy
Always verify payer-specific immunology testing guidelines.
How OptiMantra Supports Immunologic Testing
OptiMantra’s integrated EMR and practice management system streamlines documentation and billing for CPT 86160:
With OptiMantra, providers can:
- Order complement component testing within the patient chart
- Track immune markers over time for disease monitoring
- Link lab results to diagnoses and treatment plans
- Maintain organized laboratory documentation that supports billing compliance and audit preparedness
- Integrate immunology workflows into a single, efficient system
By centralizing lab and immunology workflows, OptiMantra helps practices improve efficiency, ensure compliance, and optimize reimbursement.
Try OptiMantra for free here!
Disclaimer: CPT® codes are maintained by the American Medical Association. This guide is for informational purposes only and does not replace official coding guidelines or payer policies.
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