G8629 HCPCS — Reimbursement & Policy

HCPCS Level II code G8629 denotes documentation of an order for prophylactic parenteral antibiotics to be administered within a specified preoperative window — generally within one hour before surgical incision (or procedure start), or within two hours when a fluoroquinolone or vancomycin is ordered. This timing-based measure supports adherence to surgical antimicrobial prophylaxis practices that reduce surgical site infections and align perioperative safety protocols.

The analysis covers major national payers including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what the code represents, why timing documentation matters for perioperative quality measurement and compliance, and what typical service contexts look like (operating rooms, ambulatory surgical centers, and other procedural settings). The publication provides benchmarks where available, highlights relevant policy considerations affecting coverage and coding consistency, and summarizes clinical context around preoperative antibiotic timing. Data not available in the input is noted where applicable. This brief serves clinicians, coding professionals, and policy analysts seeking a clear, national-level summary of HCPCS Level II code G8629.

Billing Code Overview

HCPCS Level II code G8629 documents the order for prophylactic parenteral antibiotic administration timed to the surgical procedure. The code applies when an order specifies that an antibiotic is to be given within one hour prior to surgical incision (or procedure start when no incision is required); if the ordered agent is a fluoroquinolone or vancomycin, the window is two hours prior to incision or procedure start.

Service type: Perioperative prophylactic parenteral antibiotic order

Typical site of service: Hospital operating room, ambulatory surgical center, or other procedural settings where parenteral antibiotics are ordered prior to surgery

Data not available in the input.

Clinical Context

A 56-year-old male scheduled for elective total knee arthroplasty in an ambulatory surgery center presents for preoperative verification. The surgeon orders prophylactic parenteral antibiotics to be administered within one hour prior to surgical incision (or within two hours if the agent is a fluoroquinolone or vancomycin). Nursing documents the antibiotic order, time of administration, agent and dose, and routes in the electronic medical record. The perioperative nurse verifies the timing relative to the scheduled incision, records allergy status, and communicates any delays to the surgical team. The documented order and administration details support billing of G8629 for the documentation of the prophylactic antibiotic order within the specified timeframe prior to incision.

Coding Specifications

Modifier	Description	When to Use
`24`	Unrelated Evaluation and Management Service by the Same Physician During a Postoperative Period	Use when E/M unrelated to the surgery is provided in the postoperative period alongside documentation of antibiotic orders.
`25`	Significant, Separately Identifiable E/M Service by the Same Physician on the Day of a Procedure

Taxonomy Code	Specialty	Notes
`207L00000X`	Orthopedic Surgery	Orthopedic surgeons commonly perform total joint procedures requiring perioperative prophylactic antibiotics.
`207P00000X`	Anesthesiology	Anesthesia providers may document timing of prophylactic antibiotics as part of perioperative management.
`208000000X`	General Surgery	General surgeons commonly order prophylactic antibiotics for open and laparoscopic procedures.
`163W00000X`	Registered Nurse	Perioperative and preoperative nurses document administration details and timing of prophylactic antibiotics.
`207K00000X`	Otolaryngology	ENT surgeons perform procedures where perioperative antibiotic timing is documented for infection prevention.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M17.11`	Unilateral primary osteoarthritis, right knee	Common indication for total knee arthroplasty where perioperative prophylactic antibiotics are ordered.
`K35.80`	Unspecified acute appendicitis	General surgical indication where timely antibiotic prophylaxis is relevant to reduce infection risk.
`K80.20`	Calculus of gallbladder without cholecystitis, without obstruction	Indication for cholecystectomy; perioperative antibiotics may be ordered and timing documented.
`N40.1`	Benign prostatic hyperplasia with lower urinary tract symptoms	Urologic procedures for which perioperative antibiotics may be documented when indicated.
`H66.90`	Otitis media, unspecified, unspecified ear	ENT-related procedures with possible operative intervention where prophylactic antibiotic timing may be documented.
`L03.90`	Cellulitis, unspecified site	Soft tissue infections may necessitate surgical drainage with periprocedural antibiotic documentation.
`I25.10`	Atherosclerotic heart disease of native coronary artery without angina pectoris	Cardiac comorbidity commonly present in surgical patients; antibiotic prophylaxis timing remains part of perioperative care.
`Z79.2`	Long term (current) use of antibiotics	Relevant to documentation when patients are already on antibiotics and perioperative prophylaxis timing requires reconciliation.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`27447`	Arthroplasty, knee, condyle and plateau; medial and lateral compartments with or without patellar resurfacing (total knee arthroplasty)	Common index surgical procedure for which perioperative prophylactic antibiotics are ordered and documented under `G8629`.
`19325`	Augmentation mammoplasty (implant)	Example of an elective procedure where timely prophylactic antibiotic ordering is standard practice.
`47562`	Laparoscopic cholecystectomy	Common general surgery procedure where perioperative antibiotics may be ordered and documentation of timing is relevant for `G8629`.
`49505`	Repair initial inguinal hernia, age 5 years or older; with mesh	Hernia repair procedures often include documented antibiotic prophylaxis in the pre-incision timeframe.
`31231`	Nasal/sinus endoscopy, diagnostic, with biopsy when performed (separate procedure)	ENT procedures where antibiotic prophylaxis timing is documented by surgeon or perioperative team.
`36620`	Arterial catheterization or cannulation for sampling, monitoring or transfusion (e.g., for endovascular procedures)	Vascular access-related procedures may accompany surgeries requiring perioperative antibiotic timing documentation.

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Summary & Overview

HCPCS G8629: Prophylactic Parenteral Antibiotic Order, Preoperative Timing