2025 CPT code 01999

Unlisted anesthesia procedure(s).

Use this code only when no specific CPT code exists for the anesthesia service provided.Always submit supporting documentation that fully describes the procedure performed, time, effort, equipment necessary to provide the service, medical necessity and comparison to existing codes.

Modifiers may be applicable to code 01999 to indicate specific circumstances, such as unusual anesthesia (23), discontinued procedures (53), or medical supervision of multiple procedures (AD, QK).Modifiers related to the patient's physical status (P1-P6) are also applicable.

Medical necessity must be clearly documented when reporting 01999. This typically includes a detailed explanation of why existing anesthesia codes are not applicable to the specific procedure performed. The rationale for the chosen anesthetic technique and any unusual circumstances impacting the delivery of anesthesia should also be documented.

The physician or other qualified healthcare professional performs and manages the anesthesia service for a procedure not described by a specific CPT code. This includes administering the anesthesia, monitoring the patient's vital signs, and providing post-anesthesia care.

In simple words: This code is used when there isn't a specific code for the type of anesthesia you received during a medical procedure. Your doctor will provide additional information to explain what was done.

This code is used to report anesthesia services for procedures that do not have a specific CPT code.It is essential to submit supporting documentation with this code to justify its use and explain why a more specific code wasn't applicable. The documentation should describe the procedure, the time, effort, and equipment required.

Example 1: A patient undergoes a complex, experimental surgical procedure for which no specific anesthesia code exists. The anesthesiologist uses a combination of techniques and medications tailored to the patient and the novel procedure. Code 01999 is reported with detailed documentation justifying its use., A patient with a rare anatomical anomaly requires anesthesia for a corrective surgery. The standard approach to anesthesia cannot be used due to the patient's unique anatomy, requiring the anesthesiologist to develop and implement a modified technique. Due to the lack of a specific code, 01999 is used., A patient presents for a procedure usually performed under local anesthesia, but due to severe anxiety and needle phobia, they require general anesthesia. If no specific code exists for general anesthesia for this particular procedure, code 01999 would be reported along with documentation of the medical necessity for general anesthesia in this case.

Operative or procedure note, An accurate and complete description of the service(s) provided, including the nature, extent, and the need for the procedure, Time spent administering anesthesia, Equipment used, Medical necessity for using an unlisted code, Comparison to similar procedures with established CPT codes to justify the billed amount.

** When billing with 01999, it's highly recommended to contact the payer in advance to discuss documentation requirements and ensure proper reimbursement.

  • Revenue Code: P0 - ANESTHESIA
  • Payment Status: Active
  • Specialties:Anesthesiology
  • Place of Service:Inpatient Hospital,On Campus-Outpatient Hospital,Off Campus-Outpatient Hospital,Ambulatory Surgical Center
** Only Enterprise users with EHR integration can access case-specific answers. Click here to request access.