D9230Inhalation of Nitrous Oxide/Analgesia, Anxiolysis

What This Code Covers

D9230 covers the administration of nitrous oxide and oxygen (commonly called laughing gas) to reduce patient anxiety during a dental visit. The code includes setting up the delivery system, administering the gas, monitoring the patient throughout the procedure, and the recovery period after the gas is turned off. D9230 is billed once per visit, not per procedure. It does not include other forms of sedation such as oral sedation or IV sedation, which have their own codes.

Billing Guide

Bill this code when:

• Nitrous oxide is administered to the patient for anxiolysis (anxiety reduction) during a dental procedure
• The provider monitors the patient during gas delivery and recovery
• The service is billed once for the entire visit, regardless of how many procedures are performed during that visit
• The patient's plan includes coverage for nitrous oxide sedation

Do not bill this code when:

• Nitrous oxide was not actually administered during the visit, even if it was planned or set up
• The patient received oral sedation or IV sedation instead. Use D9248 (oral sedation) or D9239 (IV sedation) for those services
• The payer considers nitrous oxide to be included in the procedure fee. Some plans bundle it
• The patient is under general anesthesia, which is covered by separate anesthesia codes (D9220/D9221)

Insurance and Denial Prevention

Key Payer Rules:

• Many commercial plans cover D9230, but some limit it to specific age groups (commonly children under 13) or require a medical necessity reason
• Delta Dental plans vary by region. Some cover nitrous for all ages, others restrict it to pediatric patients or patients with documented anxiety disorders
• Medicaid coverage for D9230 varies widely by state. Several state programs only cover it for children or require prior authorization
• D9230 should be billed once per visit. If a patient has multiple procedures across separate visits, you can bill it for each visit

Common Denials and How to Respond:

• Not covered under plan → Verify coverage before administering. If the plan does not cover nitrous, inform the patient in advance and collect payment directly. Document the patient's agreement to pay out of pocket.
• Age limitation (adult patient) → Some plans only cover nitrous for children. If the adult patient has documented dental anxiety or a medical condition requiring it, appeal with a narrative and supporting documentation.
• Medical necessity not established → Submit a letter explaining why nitrous was necessary. Common reasons include severe dental anxiety, strong gag reflex, or a medical condition that makes other sedation methods unsafe.