Quick reference
- When to use
- Use 99354 when the service provided matches the time and activity requirements specified for this CPT code. Ensure documentation supports the code selected and time thresholds are met.
- Duration
- CPT codes are billed per session based on time thresholds. Document exact session start and end times. Ensure the documented time matches the code requirements.
- Session codes
- This is a CPT code. Pair with the appropriate ICD-10 diagnostic code(s) to support medical necessity. Always list the primary diagnosis first.
- Key indicators
- Service matches code description • Time requirements met • Documentation supports medical necessity • Appropriate diagnostic code paired • Proper modifiers applied if needed
What 99354 represents
CPT 99354 is used for prolonged clinical services in the outpatient setting when the total direct face-to-face time extends beyond the typical service period. This is an add-on code for the first hour of prolonged service.
Key diagnostic criteria
N/A – billing code for extended service time.
Documentation essentials
Document total time, medical necessity for extended service, interventions provided during the extended time, and patient response.
Differential diagnosis
N/A – distinguish from standard time-based therapy codes.
Treatment planning
Used when clinical situations require extended sessions – complex trauma processing, crisis situations, family therapy.
Insurance & billing
Add-on code requiring a primary service code. Must document medical necessity for extended time. Not all payers recognize this code.
Updates & changes
Verify current CMS guidelines for prolonged service billing.
Documentation pitfalls
Must demonstrate medical necessity. Don't use routinely – reserved for genuinely extended services.
References
- American Medical Association. (2024). CPT Professional Edition.