Summary & Overview

HCPCS G8630: Perioperative Prophylactic Parenteral Antibiotic Timing

HCPCS Level II code G8630 documents timely initiation of prophylactic parenteral antibiotics prior to surgical incision (within one hour, or within two hours for fluoroquinolones and vancomycin). The code is used to record compliance with perioperative antibiotic timing protocols intended to reduce surgical site infections and is relevant across hospitals and ambulatory surgical centers nationwide. Accurate documentation tied to this code supports quality measurement and payer review of perioperative care processes.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise review of the code’s clinical intent, typical use cases in operative settings, and the types of benchmarks and policy considerations that influence coverage and claim adjudication. The publication outlines where G8630 fits in quality reporting and operational workflows, highlights common documentation elements that support code use, and identifies where input data are not available in the source.

This briefing is written for national audiences including clinicians, coding staff, and payer policy analysts seeking clear context on the code’s purpose, typical sites of service, and the practical implications for billing and quality measurement. Data not available in the input are noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareG8630HCPCS Level IIperioperative careantibiotic prophylaxissurgical site infection preventionoperating roomdocumentationquality measure

Billing Code Overview

HCPCS Level II code G8630 documents that administration of prophylactic parenteral antibiotics was initiated within one hour (or within two hours for fluoroquinolones or vancomycin) prior to surgical incision or the start of a procedure when no incision is required, as ordered. This code captures timing-based documentation of perioperative antibiotic prophylaxis to reduce surgical site infections.

Service type: Perioperative prophylactic antibiotic administration documentation
Typical site of service: Surgical settings, including hospital operating rooms and procedural suites where surgical or invasive procedures are performed

Clinical & Coding Specifications

Clinical Context

A 58-year-old male is admitted for an elective open inguinal hernia repair under general anesthesia. Preoperative orders include prophylactic intravenous cefazolin 2 g to be administered within one hour prior to the skin incision. The perioperative nursing team documents the antibiotic name, dose, route, and precise time of administration in the anesthesia record and medication administration record. If the patient were to receive vancomycin or a fluoroquinolone instead (for beta-lactam allergy or organism coverage), administration is scheduled to complete within two hours before incision per protocol. The documentation is used to support reporting of G8630 confirming timely initiation of prophylactic parenteral antibiotics as ordered prior to the procedure start time. Typical workflow steps include: pre-op assessment and allergy review, antibiotic order entry by the surgeon or anesthesiologist, pharmacy verification/delivery, nursing administration with time stamp, and perioperative charting that captures the antibiotic start time relative to incision (or procedure start when no incision is required). Typical sites of service are the operating room for surgical procedures and ambulatory surgical centers for same-day procedures.

Coding Specifications

Modifier	Description	When to Use
`24`	Unrelated Evaluation and Management Service by the Same Physician During a Postoperative Period	Use when an unrelated E/M service is furnished during the postoperative period separate from the perioperative antibiotic documentation.
`25`	Significant, Separately Identifiable Evaluation and Management Service by the Same Physician on the Day of a Procedure	Use when a separate E/M visit is performed the same day as surgery in addition to perioperative antibiotic documentation.
`50`	Bilateral Procedure	Use when bilateral surgical procedures are performed and antibiotic documentation applies to both sides per facility policy.
`51`	Multiple Procedures	Use when multiple distinct procedures are performed during the same operative session and the antibiotic timing applies to all procedures.
`59`	Distinct Procedural Service	Use when another procedure or service is distinct and separate from the one for which antibiotic prophylaxis is documented.
`76`	Repeat Procedure or Service by Same Physician/Other Qualified Health Care Professional	Use when the same procedure is repeated by the same provider and antibiotic timing must be documented again.
`77`	Repeat Procedure by Another Physician/Other Qualified Health Care Professional	Use when a repeat procedure is performed by a different provider and antibiotic documentation is required.
`78`	Unplanned Return to the Operating Room by the Same Physician Following Initial Procedure for a Related Procedure During the Postoperative Period	Use when a return to OR requires re-documentation of prophylactic antibiotic timing.
`79`	Unrelated Procedure or Service by the Same Physician During the Postoperative Period	Use when an unrelated procedure during the postoperative period requires separate documentation.
`XE`	Separate Encounter, A Service That Is Distinct Because It Occurred During a Separate Encounter	Use for reporting distinct encounters per modifier standards when relevant to antibiotic administration timing.

Taxonomy Code	Specialty	Notes
`207P00000X`	General Surgery	Surgeons performing procedures requiring perioperative prophylactic antibiotics.
`207L00000X`	Anesthesiology	Anesthesiologists often document timing of prophylactic antibiotics in the anesthesia record.
`208600000X`	Obstetrics & Gynecology	Gynecologic surgeons for procedures requiring prophylaxis.
`363A00000X`	Nurse Anesthetist	CRNAs who document administration timing in perioperative workflow.
`163W00000X`	Registered Nurse	Perioperative and ambulatory surgical center nurses who administer and time-stamp antibiotics.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`K40.90`	Unilateral inguinal hernia, without obstruction or gangrene, unspecified side	Common indication for elective inguinal hernia repair where prophylactic antibiotics are administered and timing documented.
`K35.80`	Acute appendicitis without perforation or abscess	Indication for appendectomy where antibiotic prophylaxis prior to incision is standard; documentation supports `G8630`.
`N40.0`	Benign prostatic hyperplasia without lower urinary tract symptoms	May be associated with planned transurethral procedures where perioperative antibiotics are given and timing recorded.
`C50.912`	Malignant neoplasm of unspecified site of left female breast	When partial mastectomy or lumpectomy is performed, prophylactic antibiotics are commonly documented.
`K57.30`	Diverticulosis of large intestine without perforation or abscess	Elective colorectal procedures may require prophylactic antibiotics; timing documentation is pertinent.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`10060`	Incision and drainage of abscess; simple or single	Example of a procedure where perioperative antibiotics may be documented; timing of prophylaxis would be recorded when indicated.
`19301`	Partial mastectomy	Elective surgical procedure commonly requiring perioperative antibiotic prophylaxis; documentation of timing supports `G8630`.
`44950`	Appendectomy; single or initial approach	An intra-abdominal procedure for which timely prophylactic antibiotics are standard and documented relative to incision.
`49505`	Repair initial inguinal hernia, age 5 years or older; reducible	Common outpatient surgical procedure where pre-incision antibiotic timing is documented in the operative record.
`52601`	Transurethral removal of prostate tissue; electrosurgical resection	Urologic procedure where perioperative antibiotic administration timing is documented when prophylaxis is used.