What Are Anesthesia Qualifying Circumstance Codes?
Since at least the 80s, commercial and managed care insurance companies have allowed additional payment for something called “Qualifying Circumstances”. These are increased patient risk factors affecting the anesthesia case, such as:
99100 – Extreme Age (< 1 or > 70) – 1 unit
99116 – Total Body Hypothermia (rarely billed) – 5 units
99135 – Deliberate/Controlled Hypotension (requires surgeon request be charted) – 5 units
99140 – Emergency (imminent threat to life or limb) – 2 units
To begin, let’s break down the potential utilization by code.
Extreme Age: Should be billed to all non-governmental carriers/plans, where allowed. No charting necessary, as patient age at time of anesthetic is picked up by biller.
Hypothermia: Somewhat outdated code which is rarely billed, due to clinical advances tied to Cardiac Anesthesia.
Deliberate Hypotension: Billable with charted surgeon request. No defined standard on blood pressure threshold, although some groups use ≤ 80% of baseline. Other groups have mandated the use of an arterial line for billing purposes.
Emergency: Examples include potential threat to life (OB – fetal distress with non-reassured heart tones) and Open Fractures.
Who Pays for the Codes?
Now that we have the background, let’s answer the big question; who pays for these codes and what’s the payment range? Looking at MSN Anesthesia Billing Clients, we’ve assembled the list below, based on 2025 claims. Keep in mind that although traditional Medicare doesn’t cover these CPTs, there are Medicare and Medicaid Managed Care plans that do. Payment is typically 1-5 units, based on the code billed. Bottom line: If your biller is not capturing these codes from your source documentation, it’s costing your practice real money.
Extreme Age 99100: < $50 to $102
Hypothermia 99116: No Payment History
Deliberate Hypotension 99135: $243 to $330
Emergency 99140: < $50 to $240
One thing to watch on the horizon is United Healthcare’s draft policy, set to go into effect on 10/1/25. If enacted, the policy would eliminate future payments for the Qualifying Circumstance codes, as well as Physical Status modifiers P3-P5. It would also reduce payment for non-medically-directed anesthesia claims (-QZ modifier) by 15%.
Hal has 30+ years of experience on both the payor and RCM side, with a focus in Anesthesia. He formerly worked as a senior claims approver at United Healthcare, as well as a compliance officer for multiple national anesthesia billing companies. His broad-based experience ensures that MSN clients have a resource for documentation and billing issues. His past speaking engagements include ASA, MGMA, Dartmouth, and Johns Hopkins.
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