Summary & Overview
HCPCS G9644: Preoperative Smoking Abstinence Before Anesthesia
HCPCS Level II code G9644 documents patients who abstained from smoking prior to anesthesia on the day of surgery or procedure. Nationally, accurate reporting of preoperative smoking abstinence supports perioperative risk assessment, quality measurement, and clinical documentation that can inform anesthesia planning and patient counseling. This code captures a discrete behavioral status that is relevant for anesthesia care teams, surgical services, and institutional quality programs.
Key payers in the coverage landscape include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what G9644 represents, the typical clinical and service contexts in which it is used, and what to expect when this item appears on a claim or in procedural documentation. The publication provides benchmarks where available, notes on common billing and documentation considerations, and the clinical relevance of documenting smoking abstinence immediately before anesthesia. It also outlines where to find additional policy details and reporting guidance.
This national summary is intended for billing professionals, perioperative clinicians, and policy analysts seeking clear, practice-oriented information about HCPCS Level II code G9644. Data not available in the input is identified where applicable.
Billing Code Overview
HCPCS Level II code G9644 denotes patients who abstained from smoking prior to anesthesia on the day of surgery or procedure. This code documents preoperative smoking abstinence as part of the perioperative evaluation and care process.
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Service type: Preoperative behavioral/health status documentation tied to anesthesia and surgical care
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Typical site of service: Hospital outpatient department, ambulatory surgery center, or other surgical procedure settings where anesthesia is administered
Clinical & Coding Specifications
Clinical Context
A typical patient is a 58-year-old scheduled for an elective total knee arthroplasty under general or regional anesthesia. At preoperative screening and again on the day of surgery, the anesthesiology team confirms that the patient has abstained from smoking for the required period and documents this in the anesthesia record. Nursing obtains the smoking history during pre-op assessment; the anesthesia provider documents smoking abstinence immediately prior to induction. The billing code G9644 is reported to indicate that the patient abstained from smoking prior to administration of anesthesia on the day of the procedure. Typical workflow steps include preoperative evaluation in the clinic or pre-op unit, verbal confirmation and documentation of smoking status on the day of surgery, anesthesia induction, performance of the surgical procedure in an ambulatory surgery center or hospital operating room, and post-anesthesia care unit (PACU) recovery before discharge or inpatient admission. Common payors for encounter reconciliation include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when anesthesia-related services involve substantially greater work due to complications related to smoking cessation status or unexpected complexity at induction. |