Ped crit care transport
CPT code 99466 covers the critical care provided during the first 30-74 minutes of interfacility transport for a critically ill or injured pediatric patient. This includes the physician's face-to-face care during ground or air ambulance transport between facilities.
RVU breakdown
Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High
Billing tips
Document exact start and stop times of face-to-face physician care during transport. The 30-74 minute window must be clearly documented with time stamps for departure from sending facility and arrival at receiving facility.
Impact: Inadequate time documentation is the #1 denial reason. Proper documentation protects the full $221.25 reimbursement and prevents downcoding or denials.
Bill 99467 for each additional 30 minutes beyond the first 74 minutes. If transport time exceeds 74 minutes, you can add 99467 for each additional half-hour increment.
Impact: Capturing extended transport time can add $110.63 per additional 30-minute increment, potentially doubling or tripling total reimbursement for longer transports.
Verify patient age is 24 months or younger at time of transport. Age eligibility is strictly enforced, and patients over 24 months require different codes (99485-99486).
Impact: Age documentation errors lead to immediate denials. Using correct age-based codes prevents 100% claim rejection and rebilling delays.
Ensure the service is truly interfacility transport. 99466 cannot be billed for transport from scene (use 99291) or for care provided before or after transport itself.
Impact: Misuse of 99466 for non-transport critical care results in denials, potential audits, and recoupment of payments averaging $221.25 per claim.
Do not bill separately for procedures or services included in critical care transport (intubation, vascular access, etc.). These are bundled into the transport code.
Impact: Unbundling bundled services triggers automatic denials and potential fraud investigations. Keeping services bundled ensures clean claims and avoids compliance risk.
Bill the rendering physician's NPI, not the facility or ambulance service. The physician providing face-to-face care must be clearly identified as the rendering provider.
Impact: Incorrect provider identification causes payment delays or misdirected payments, potentially preventing the physician from receiving the $221.25 reimbursement.
Common denials
Insufficient documentation of time spent providing face-to-face critical care during transport
How to appeal: Submit transport log with documented departure time from sending facility and arrival time at receiving facility, physician attestation of continuous face-to-face care, and detailed clinical documentation showing critical care interventions performed during transport. Include EMS run sheets if available.
Patient age exceeds 24 months at time of transport
How to appeal: If patient was actually 24 months or younger, submit birth certificate or medical record documentation proving correct age. If patient was older, resubmit claim with correct code (99485 for initial 30-74 minutes for patients over 24 months) and request correction rather than appeal.
Service denied as not meeting medical necessity criteria for physician-level critical care during transport
How to appeal: Provide detailed clinical documentation demonstrating patient's critical illness requiring continuous physician-level monitoring and intervention. Include vital signs, interventions performed (ventilator management, vasoactive medications, etc.), and explanation of why lesser-level transport would have been inadequate for patient's condition.
Denial for duplicate billing when billed same day as other critical care codes (99291, 99471-99476)
How to appeal: Clarify that 99466 is specifically for interfacility transport time only. Submit time logs showing distinct periods: pre-transport critical care (if any), transport care time (99466), and post-transport care (if any). Demonstrate no time overlap between different critical care services.
Frequently asked questions
What is the Medicare reimbursement rate for CPT code 99466 in 2025?
The 2025 Medicare national average reimbursement rate for CPT code 99466 is $221.25 for both facility and non-facility settings. This rate is based on 6.84 total RVUs multiplied by the 2025 conversion factor of 32.3465.
How long must the transport last to bill CPT code 99466?
CPT code 99466 covers the first 30-74 minutes of face-to-face physician critical care during interfacility transport. The minimum is 30 minutes; anything less cannot be billed. If transport exceeds 74 minutes, you bill 99466 for the first portion and add 99467 for each additional 30-minute increment.
What is the age limit for billing CPT code 99466?
CPT code 99466 is only for patients 24 months of age or younger at the time of transport. For critically ill or injured patients older than 24 months through 24 years, use CPT codes 99485-99486 instead. Age must be clearly documented in the medical record.
Can you bill 99466 and 99291 on the same day?
Yes, but only for distinctly separate time periods with clear documentation. You cannot bill both codes for the same time period. For example, 99291 might be billed for critical care provided at the sending facility before transport, while 99466 covers the actual transport time. Time logs must show no overlap between the services.
What is the difference between 99466 and 99485?
CPT 99466 is for critical care transport of patients 24 months or younger, while 99485 is for patients over 24 months through 24 years of age. Both cover the first 30-74 minutes of interfacility transport, but the age distinction determines which code to use. The clinical service is similar, but codes are age-specific.
Do I need to bill the ambulance transport separately from CPT 99466?
Yes, CPT 99466 only covers the physician's professional services during transport. The ambulance company separately bills ambulance transport codes (A0426, A0427, A0428, A0429, A0430, A0431, A0432, A0433, A0434, A0435, A0436) for the vehicle, crew, and basic transport services. These are distinct services with separate reimbursement.
What procedures are included in CPT 99466 and cannot be billed separately?
CPT 99466 includes all routine critical care procedures performed during transport: chest X-ray interpretation, pulse oximetry, blood gases interpretation, gastric intubation, temporary transcutaneous pacing, ventilator management, vascular access procedures, and routine monitoring. These services are bundled and cannot be separately billed when performed during the transport time covered by 99466.