How to bill 90 minutes of critical care?

To bill 90 minutes of critical care, report CPT Code 99291 once for the first 30–74 minutes, but the billing for the remaining time depends on whether the payer follows standard CPT guidelines or Medicare (CMS) rules.

Coding Breakdown for 90 Minutes

• Standard CPT Guidelines (Most Commercial Payers): Report 99291 × 1 (for 30–74 minutes) plus 99292 × 1 (for the remaining time once past 74 minutes, as CPT allows the add-on code past the initial threshold).
• Medicare / CMS Guidelines: Report 99291 × 1 only. CMS requires a full additional 30 minutes past the 74-minute mark (reaching 104 total minutes) before 99292 can be billed. At 90 minutes, you are in the 75–103 minute range for Medicare and cannot add the 99292 code.

Documentation Requirements

• Total Time: Clearly document the cumulative time spent (e.g., exact start and stop times or total duration like "90 minutes").
• Medical Necessity: Chart the acute impairment of one or more vital organ systems and the probability of imminent, life-threatening deterioration.
• Location: Ensure care was provided at the bedside or on the unit while remaining immediately available to the patient.

For 90 minutes of critical care, you bill CPT code 99291 under Medicare rules, or 99291 combined with one unit of 99292 under standard CPT guidelines.

Understanding the Codes

• CPT 99291: Covers the first 30 to 74 minutes of critical care on a given calendar date.
• CPT 99292: An add-on code covering each additional 30 minutes of critical care.

Payer Differences for 90 Minutes

• Standard CPT Guidelines: Under standard CPT midpoint rules, the threshold to add the first unit of 99292 is 75 total minutes (at 75 minutes, you report 99291 + 99292). At 90 minutes, standard CPT guidelines allow reporting 99291 and 1 unit of 99292.
• Medicare / CMS Rules: Medicare requires a full 104 minutes of total critical care time before you can bill the first unit of 99292. For exactly 90 minutes of care, Medicare only permits the base code 99291.

You can review official definitions and time limits on the ACEP Critical Care FAQ to ensure proper coding.

Billing critical care time requires tracking cumulative direct and indirect minutes, meeting specific medical necessity criteria, and applying correct CPT codes.

Core CPT Codes

• 99291: First 30 to 74 minutes of critical care on a given calendar date.
• 99292: Each additional block of time (add-on code).

Time Threshold Rules

• Minimum Time: Care must last at least 30 cumulative minutes to report 99291. Time does not need to be continuous, but each block must involve active management.
• Commercial vs. Medicare (The 104-Minute Rule):
  • Commercial Payers: Generally follow standard CPT midpoint rules, allowing 99292 once 75 total minutes are reached (15 minutes into the second 30-minute block).
  • Medicare / CMS: Requires a full additional 30 minutes past 74 minutes before billing 99292, meaning you must reach 104 total minutes to bill 99291 plus one unit of 99292.

What Counts as Critical Care Time

• Direct bedside patient care.
• Reviewing test results or discussing the case with consultants.
• Documenting in the medical record.
• Speaking with family members or surrogate decision-makers only if the patient is unable or lacks capacity to participate in discussions.

What is Excluded and Bundled

• Separately Billable Procedures: Time spent performing distinct, separately billable procedures (like central line placement, endotracheal intubation, or CPR) must be subtracted from the total critical care time.
• Bundled Services: Routine tasks like pulse oximetry, blood gases, chest X-rays, and ventilator management are already included in the critical care codes and cannot be billed separately.

A 90-minute individual therapy session is typically billed using CPT code 90837 (60-minute psychotherapy, which covers any session lasting 53 minutes or longer), as there is no specific 90-minute CPT code or active prolonged-services add-on code for routine outpatient psychotherapy.

How Insurance Handles 90-Minute Sessions

• Single Code Only: Most commercial insurance plans and Medicare only reimburse 90837 once per encounter, meaning you are paid the standard 60-minute rate even if the session lasts 90 minutes.
• No Add-Ons: Previous prolonged-services add-on codes (like 99354) have been deleted by the AMA for psychotherapy billing.
• Do Not Double-Bill Units: Avoid billing two units of 90834 or 90837 on the same day; this practice is generally rejected by payers and increases your risk of a post-payment audit and clawbacks.

Best Practices for Billing and Documentation

• Check Payer Policies: Always contact the specific insurance carrier beforehand to verify their extended session guidelines and whether they require prior authorization.
• Document Start and Stop Times: Explicitly record the exact start and stop times in your clinical notes.
• Establish Medical Necessity: Clearly document the clinical rationale and justification for why a 90-minute session was necessary rather than a standard 53+ minute session.
• Consider Private Pay: If insurance does not cover the extended time, many providers utilize a separate private-pay or self-pay agreement for the remaining 30 minutes.

CMS guidelines for billing critical care services require providers to use specific time-based CPT codes, meet strict medical necessity criteria for acute life-threatening conditions, and follow unique Medicare time accumulation rules.

Core CPT Codes & Time Rules

• CPT 99291: Report for the first 30 to 74 minutes of critical care provided on a single calendar day. It can only be billed once per patient, per date of service.
• CPT 99292: Report as an add-on code for each additional 30-minute increment.
• The 104-Minute Rule: Unlike standard CPT guidelines that allow billing 99292 at 75 minutes using standard rounding, CMS requires a full additional 30 minutes past the initial 74 minutes—meaning you must reach 104 total minutes before billing the first unit of 99292 (74 + 30 = 104).
• Total Time Documentation: The medical record must state the exact total minutes spent personally providing care. Non-continuous blocks of time on the same date may be added together.

Definition & Medical Necessity

• Critical Illness/Injury: Documentation must show an acute condition with severe impairment of one or more vital organ systems and a high probability of imminent, life-threatening deterioration.
• Active Management: Care must involve active, direct medical decision-making and treatment by the practitioner. A serious diagnosis alone does not justify critical care.
• Excluded Activities: Time spent on teaching, telephone calls off the unit, or chart reviews without the patient present does not count toward critical care time.

Bundled Services

Routine supportive care is already bundled into critical care codes and cannot be billed separately. Bundled items include:

• Chest X-rays
• Pulse oximetry
• Blood gases
• Gastric intubation
• ECG / EKG data collection and interpretation
• Ventilator management
• Vascular access procedures

Split/Shared Visits & Same-Day E/M

• Split/Shared Critical Care: When a physician and an advanced practice provider (NPP) from the same group practice jointly care for a patient, the provider performing the substantive portion (more than 50% of the total cumulative time) bills the service. Append modifier -FS. The 104-minute threshold still applies to combined time before adding 99292.
• Same-Day Other E/M: If a non-critical E/M visit occurs earlier on the same day before the patient deteriorated into a critical state, both visits may be billed if documented as separate and distinct. Append modifier -25 to the critical care code.