Critical care first hour
CPT code 99291 covers the first 30-74 minutes a physician spends providing critical care to a critically ill or injured patient whose condition requires immediate, intensive medical attention. This includes bedside evaluation, treatment, and monitoring of patients at high risk of life-threatening deterioration.
RVU breakdown
Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High
Billing tips
Document total time spent on critical care activities down to the minute, including time reviewing records, discussing with family, and coordinating care while on the unit, but exclude separately billable procedures
Impact: Prevents 30-40% of denials related to insufficient time documentation; difference between $0 and $265.56 payment when time falls below 30-minute threshold
Bill 99291 only once per date regardless of time spent; use 99292 for each additional 30 minutes beyond the first 74 minutes (e.g., 105 minutes = 99291 + one 99292)
Impact: Correct time-based billing can add $129.82 per additional 30-minute block with 99292; incorrect duplicate 99291 billing triggers automatic denials
Clearly document the critical illness or injury and specific vital organ system(s) at risk of imminent life-threatening deterioration in your note header or chief complaint
Impact: Reduces medical necessity denials by approximately 25%; auditors look for this within first few lines of documentation
Separately document and bill for procedures performed during critical care time (central lines, intubation, chest tubes) as these minutes cannot count toward 99291 time
Impact: Can add $150-$500 in additional revenue per encounter but requires subtracting procedure time from total critical care minutes
Use facility rate ($205.72) when billing for hospital-based services; non-facility rate ($265.56) applies only to office/clinic critical care (rare)
Impact: $59.84 overpayment risk per claim if billed incorrectly; nearly all 99291 claims should use facility rate
Only one physician per group/specialty can bill critical care per patient per day unless clearly documented as separate, distinct critical illness episodes
Impact: Prevents denials for duplicate billing; coordinate within group to avoid $265.56+ payment recoupments
Common denials
Time not documented or documented as less than 30 minutes (minimum threshold for 99291)
How to appeal: Submit amended documentation with specific start/stop times or cumulative minute calculation. Include timestamped medical record entries showing bedside presence. Reference CPT guidelines stating 30-74 minutes qualifies for 99291. If time genuinely below 30 minutes, downcode to appropriate E&M level (99221-99223, 99231-99233) rather than appeal.
Medical necessity not established; patient condition not documented as critically ill with high probability of life-threatening deterioration
How to appeal: Provide detailed letter citing specific clinical indicators of critical illness: vital signs, laboratory values, imaging findings, organ system failures present. Reference medical literature on severity scoring systems (APACHE, SOFA) if applicable. Include documentation of high-complexity medical decision making and intensive monitoring/interventions performed.
Services performed by multiple physicians from same group on same date, triggering duplicate billing edits
How to appeal: Clarify which physician provided critical care and total time. If multiple physicians legitimately provided separate critical care episodes for distinct conditions, document separate time periods and distinct medical issues. Otherwise, combine time under single physician and withdraw duplicate claim.
Critical care billed on same date as procedure with global period without modifier 25, resulting in bundled denial
How to appeal: Resubmit claim with modifier 25 appended to 99291. Provide documentation showing critical care was separate and distinct from procedure, performed at different time, or for different condition than procedure indication. Clearly document time spent on critical care excluding procedure time.
Frequently asked questions
How much does Medicare pay for CPT code 99291 in 2025?
Medicare pays $265.56 for 99291 in non-facility settings and $205.72 in facility settings (hospital-based) under the 2025 Physician Fee Schedule. Most 99291 services are billed at the facility rate since critical care typically occurs in hospitals. The work RVU is 4.5 with total RVUs of 8.21.
What is the minimum time required to bill 99291?
The minimum time requirement for 99291 is 30 minutes of critical care services. Time from 30-74 minutes qualifies for one unit of 99291. Less than 30 minutes cannot be billed as critical care and should be reported with an appropriate E&M code instead. Time must be personally spent by the billing physician providing critical care.
Can you bill 99291 and 99292 together?
Yes, 99291 and 99292 are commonly billed together when critical care extends beyond 74 minutes. Bill 99291 for the first 30-74 minutes, then add 99292 for each additional 30 minutes. For example, 105 minutes equals 99291 plus one unit of 99292; 140 minutes equals 99291 plus two units of 99292.
What diagnoses qualify for critical care billing?
Qualifying diagnoses involve critical illness or injury with high probability of life-threatening deterioration, such as septic shock, respiratory failure requiring ventilation, cardiogenic shock, acute renal failure, DKA with severe metabolic derangement, multiple trauma, post-cardiac arrest, severe GI bleeding with hemodynamic instability, or acute liver failure. The patient's condition, not location, determines qualification.
Can you bill 99291 in the emergency department?
Yes, 99291 can be billed in the emergency department when a patient is critically ill and the physician provides at least 30 minutes of critical care services. However, you cannot bill both 99291 and ED E&M codes (99281-99285) for the same patient encounter. Choose the code that best represents the service provided and is most advantageous.
Do procedures performed during critical care count toward the time?
No, time spent performing separately billable procedures must be subtracted from total critical care time. Procedures like central line placement, intubation, chest tubes, cardioversion, and others listed in CPT guidelines should be billed separately and their time excluded from 99291. Only direct critical care management time counts toward the 30-minute threshold.
How do you document critical care time correctly?
Document either specific start and stop times (e.g., 'Critical care provided from 14:30 to 15:45, total 75 minutes') or list cumulative time with activities ('20 minutes bedside exam and ventilator management, 15 minutes reviewing labs and imaging, 10 minutes family discussion, 20 minutes treatment adjustments = 65 minutes total'). Exclude time for separately billed procedures and clearly state total critical care minutes.