Summary & Overview

CPT 00634: Anesthesia for Thoracic Spine and Cord Procedures

CPT code 00634 is used to report anesthesia services for procedures involving the thoracic spine and spinal cord when no specific procedure is otherwise described. This code is significant for hospitals and providers specializing in spinal surgery, as it ensures accurate billing and reimbursement for complex anesthesia care. Nationally, the code is recognized by major payers such as Blue Cross Blue Shield and Cigna Health, reflecting its widespread applicability in inpatient hospital settings.

This publication provides a comprehensive overview of CPT 00634, including its clinical context, typical site of service, and associated billing practices. Readers will gain insight into payer coverage, common modifiers, and related codes, as well as the relevant taxonomies and ICD-10 diagnoses frequently linked to thoracic spine procedures. The article also highlights policy updates and benchmarks that impact anesthesia billing for spinal interventions, offering clarity for healthcare administrators, billing professionals, and clinical teams. By understanding the nuances of CPT 00634, stakeholders can ensure compliance and optimize documentation for anesthesia services in thoracic spine procedures.

Blue Cross Blue ShieldCigna HealthCPT 00634anesthesiologyspine procedureshospital billinginpatient servicesmedical codingthoracic spineanesthesia documentationclinical benchmarks

CPT Code Overview

CPT 00634 is designated for anesthesia services provided during procedures on the thoracic spine and spinal cord that are not otherwise specified. This code falls under the anesthesiology service type and is most commonly utilized in the inpatient hospital setting (POS 21). The code is essential for accurately reporting and reimbursing anesthesia care for complex spinal interventions, ensuring proper documentation and compliance within hospital environments.

Clinical & Coding Specifications

Clinical Context

A typical patient scenario involves an adult patient admitted to an inpatient hospital for a surgical procedure on the thoracic spine and spinal cord. The patient may present with symptoms such as back pain, neurological deficits, or signs of spinal cord compression. Common underlying conditions include spinal stenosis, intervertebral disc disorders with myelopathy, or unspecified diseases of the spinal cord. The anesthesiology team provides anesthesia services for the procedure, ensuring patient safety and comfort throughout the operation. The workflow includes preoperative assessment, administration of anesthesia, intraoperative monitoring, and postoperative care.

Coding Specifications

Modifier Code	Description	When Used
`QS`	Monitored anesthesia care service	Used when anesthesia is provided as monitored anesthesia care rather than general anesthesia.
`QX`	CRNA service with medical direction by a physician	Used when a Certified Registered Nurse Anesthetist (CRNA) provides anesthesia services under the medical direction of a physician.

Associated Provider Taxonomies:

National Reimbursement Benchmarks

Nationally, the mean rate for CPT code 00634 is substantially higher for BUCA (average commercial) payers compared to Medicare, with BUCA at $873.27 and no Medicare data available in the input. Blue Cross Blue Shield and Cigna also show significant differences, with Cigna's mean rate at $1,318.49 and Blue Cross Blue Shield at $80.02.

Rate dispersion varies widely across payers. Blue Cross Blue Shield exhibits the tightest range, with all percentiles at $80.00, indicating no variation. Cigna and BUCA display much broader ranges, with Cigna's 25th to 75th percentile spanning $237.50 and BUCA's range at $1,355.00. This highlights considerable variability in commercial reimbursement rates.

The table and chart below present the full breakdown of national benchmarks for CPT code 00634 by payer.

State Benchmarks

State: AK1 / 49

Alaska Benchmarks

For CPT code 00634, Alaska shows a pronounced rate spread between payers. Blue Cross Blue Shield exhibits no rate spread, with all percentiles at $80.00, while Cigna's rates are consistently $869.50 across all percentiles, resulting in a rate spread of $0 for both payers. Compared to national averages, Cigna's mean rate in Alaska is lower than its national mean, while Blue Cross Blue Shield's mean rate is nearly identical to its national average.

The table and chart below present the full breakdown of mean rates and percentiles for each payer in Alaska, highlighting the significant difference between Blue Cross Blue Shield and Cigna for CPT code 00634.

Key Insights for Alaska

Cigna is the highest paying payer for CPT 00634 in Alaska, with a mean rate of $869.50.
Blue Cross Blue Shield is the lowest paying payer, with a mean rate of $80.82.
Cigna's mean rate in Alaska is significantly higher than both the state and national averages for Blue Cross Blue Shield, highlighting a substantial deviation.

Related Codes

00640

CPT 00640: Anesthesia for Spine and Spinal Cord Procedures

00630

CPT 00630: Anesthesia for Lumbar Procedures, Not Otherwise Specified

00541

CPT 00541: Anesthesia for Thoracotomy with One Lung Ventilation

00537

CPT 00537: Anesthesia for Cardiac Electrophysiologic Procedures

00566

CPT 00566: Anesthesia for Direct CABG Without Pump Oxygenator

00534

CPT 00534: Anesthesia for Transvenous Cardioverter–Defibrillator Insertion

00542

CPT 00542: Anesthesia for Removal of Lung Lining

00410

CPT 00410: Anesthesia for Procedure to Correct Abnormal Heart Rhythm

00546

CPT 00546: Anesthesia for Intrathoracic Procedures

00522

CPT 00522: Anesthesia for Needle Biopsy of Pleura, Closed Chest Procedure

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