Claims · Updated 2026-09-08 · 4 min read

Is nitrous oxide bundled into IV sedation or general anesthesia?

Yes. Delta bars a separate D9230 fee alongside IV sedation or general anesthesia and the CDT descriptor Cigna prints puts nitrous inside the sedation code.

Yes. Nitrous oxide (D9230) given alongside intravenous moderate sedation (D9239/D9243) or deep sedation and general anesthesia (D9222–D9225) is not separately payable, and on a participating claim it is not billable to the patient either. Two carriers say it two ways. Delta Dental names the codes outright. Cigna does not need a bundling policy at all, because the CDT descriptor it prints for the deeper sedation codes already reads "with or without co-administration of nitrous oxide" — the nitrous is inside the code being billed. Guardian states the general law that produces the same result: the less inclusive form of anesthesia is inclusive of the more comprehensive one. As of September 2026 Kaylie publishes no measured rate for nitrous bundling.

What we measured

Every remittance line for those codes at Delta Dental, all dates, measured on 8 September 2026 across 37 practices and more than 170 payers. Two cautions. These are small totals, and they measure the deeper sedation codes being bundled into something else — not nitrous being bundled into them. Delta's published documents state a nitrous-into-sedation rule but do not say why these sedation lines were bundled, so no mechanism is offered here.

What the carriers' own policies say

Delta Dental's national processing policies, in the DeltaUSA Dentist Handbook, January 2026 and word for word in the Delta Dental of New Jersey 2023 Participating Dentist Handbook, under D9230:

"Benefits for analgesia are denied unless covered by the group/individual contract. When covered: Fees for multiple D9230 are not billable to the patient on the same date of service. Fees for D9230 are not billable to the patient in conjunction with IV sedation (D9239 and D9243) and general anesthesia (D9222, D9223, D9224 and D9225)."

Two rules sit in that paragraph. Nitrous is not separately billable with deeper sedation, and multiple units of nitrous on one date are not billable either.

The Cigna Dental Clinical Coverage Determination Guidelines, DPPO and Indemnity, 2026 (document 928339) settles it by definition rather than by policy. The descriptor Cigna prints for D9222:

"D9222 - Administration of Deep Sedation/General anesthesia, first 15 minute increment, or any portion thereof. With or without co-administration of nitrous oxide."

The same phrase appears on D9224 and on D9239, intravenous moderate sedation. Cigna also states the condition every sedation code has to meet before any of this matters: it is allowable "Only when performed in conjunction with a covered service(s) that is/are determined to be allowable according to dental plan guidelines."

Guardian's DentalGuard Preferred Network Dentist Manual, November 2020, Colorado state appendix, states the principle and then prints the ladder:

"Anesthesia – the less inclusive form of anesthesia will be inclusive of the more comprehensive form of anesthesia." "Anesthesia is listed in the order of the least comprehensive to the most comprehensive: Local anesthesia, Regional block anesthesia, Trigeminal division block anesthesia, Non-intravenous conscious sedation, Intravenous sedation and General anesthesia."

Guardian also publishes a condition on the general anesthesia itself, in a list of what it calls "some of the more common limitations" and says "vary depending on the specific plan design chosen by the employer". On many Guardian plans, general anesthesia is covered "when done in conjunction with either a surgical procedure or three or more simple extractions, done on the same day."

Why it depends on the plan

Whether nitrous is bundled is settled. Whether nitrous is covered at all is not, and that is the question offices are usually really asking. Delta's own wording makes the dependency explicit — "Benefits for analgesia are denied unless covered by the group/individual contract" — so on many plans D9230 is not a benefit in the first place, and the bundling rule never gets a chance to apply.

Cigna's condition adds a second dependency that catches sedation claims regularly: the sedation only rides a covered service. If the procedure it was given for is not allowable under the plan, the sedation is not allowable either, however well documented the sedation itself is.

What to do

• Bill the deepest level of sedation administered, once. Do not add D9230 to an IV sedation or general anesthesia claim, and do not bill multiple nitrous units for a long appointment.
• Check whether the plan covers analgesia at all before quoting nitrous as a benefit. On many groups it is simply not purchased.
• Confirm the underlying procedure is covered before promising the sedation will be. Cigna pays sedation only alongside an allowable service.
• Where general anesthesia is planned, check the plan's own condition for it — on many Guardian plans it is covered only alongside a surgical procedure or three or more simple extractions on the day.
• Do not bill the patient for nitrous denied alongside deeper sedation on a participating claim; Delta states the fee is not billable to the patient. An out-of-network dentist has made no such agreement and may charge for it separately.

Numbers last refreshed September 2026.

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