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Summary & Overview

CPT 01320: Anesthesia for Knee and Popliteal Area Procedures

CPT code 01320 represents anesthesia services for procedures involving the knee and popliteal area, a critical component in orthopedic and surgical care. This code is widely used across outpatient hospital settings to ensure safe and effective anesthesia management during knee-related interventions. Nationally, the code is recognized by major payers including Aetna, Blue Cross Blue Shield, Cigna Health, and UnitedHealthcare, reflecting its broad applicability and importance in medical billing and reimbursement.

This publication provides a comprehensive overview of CPT code 01320, covering payer coverage, clinical context, and relevant billing benchmarks. Readers will gain insight into the typical use cases for this anesthesia code, including its role in facilitating procedures for conditions such as osteoarthritis and ligament injuries. The article also highlights common modifiers and associated provider taxonomies, offering clarity on documentation requirements and policy updates. By understanding the nuances of CPT code 01320, healthcare professionals and billing specialists can stay informed about current practices and ensure compliance with payer guidelines.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareCPT 01320anesthesiaknee procedurespopliteal areaoutpatient hospitalmedical billingorthopedicsprocedure codingclinical documentationpolicy updates

CPT Code Overview

CPT code 01320 is used to report anesthesia services for procedures performed on the knee and popliteal area. This code applies to cases where anesthesia is required to facilitate surgical or diagnostic interventions in these regions. The service type is anesthesia, and the typical site of service is an outpatient hospital (Place of Service 22). This code is essential for accurately documenting and billing anesthesia care provided during knee and popliteal procedures.

Clinical & Coding Specifications

Clinical Context

A patient presents to the outpatient hospital with chronic knee pain and functional limitation due to unilateral primary osteoarthritis of the right or left knee, or with acute injury such as a sprain of the medial collateral ligament. The orthopedic surgeon schedules a surgical procedure on the knee or popliteal area, such as arthroscopy or ligament repair. An anesthesia provider, such as an anesthesiologist, certified registered nurse anesthetist, or anesthesiology assistant, administers anesthesia for the procedure. The anesthesia service is coded with 01320 to reflect anesthesia for procedures on the knee and popliteal area. The clinical workflow involves preoperative assessment, induction and maintenance of anesthesia, intraoperative monitoring, and postoperative care in the outpatient setting.

Coding Specifications

Modifiers:
- QS: Monitored anesthesia care service. Used when the anesthesia provider delivers monitored anesthesia care (MAC) during the procedure.
- 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.
Provider Taxonomies:

Taxonomy Code Specialty Name
207L00000X Anesthesiology
367500000X Certified Registered Nurse Anesthetist
207RA0401X Anesthesiology Assistant

Taxonomy Code	Specialty Name
`207L00000X`	Anesthesiology
`367500000X`	Certified Registered Nurse Anesthetist
`207RA0401X`	Anesthesiology Assistant

These taxonomies represent the specialties eligible to provide and bill for anesthesia services for knee and popliteal area procedures.

Related Diagnoses

M17.11: Unilateral primary osteoarthritis, right knee
- Indicates chronic degenerative changes in the right knee, often necessitating surgical intervention requiring anesthesia.
M17.12: Unilateral primary osteoarthritis, left knee
- Represents chronic osteoarthritis in the left knee, relevant for procedures requiring anesthesia.
S83.241A: Sprain of medial collateral ligament of right knee, initial encounter
- Acute injury to the right knee's medial collateral ligament, commonly treated with surgical repair under anesthesia.
S83.242A: Sprain of medial collateral ligament of left knee, initial encounter
- Acute injury to the left knee's medial collateral ligament, may require anesthesia for surgical management.
M23.50: Chronic instability of knee, unspecified knee
- Describes ongoing instability in the knee, which can lead to surgical procedures necessitating anesthesia services.

Related CPT Codes

01320: Anesthesia for procedures on the knee and popliteal area
- Primary code for anesthesia services during knee or popliteal procedures.
01340: Anesthesia for procedures on the knee and popliteal area
- Related code that may be used for similar procedures. It can serve as an alternative or be used in conjunction with 01320 depending on the specific surgical intervention and anesthesia requirements.

Both codes are used in the clinical workflow for anesthesia during knee and popliteal area surgeries. Selection depends on the exact procedure performed and anesthesia technique required.

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Summary & Overview

CPT 01320: Anesthesia for Knee and Popliteal Area Procedures

CPT Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifiers:
- QS: Monitored anesthesia care service. Used when the anesthesia provider delivers monitored anesthesia care (MAC) during the procedure.
- 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.
Provider Taxonomies:

Taxonomy Code Specialty Name
207L00000X Anesthesiology
367500000X Certified Registered Nurse Anesthetist
207RA0401X Anesthesiology Assistant

Taxonomy Code	Specialty Name
`207L00000X`	Anesthesiology
`367500000X`	Certified Registered Nurse Anesthetist
`207RA0401X`	Anesthesiology Assistant

These taxonomies represent the specialties eligible to provide and bill for anesthesia services for knee and popliteal area procedures.

Related Diagnoses

M17.11: Unilateral primary osteoarthritis, right knee
- Indicates chronic degenerative changes in the right knee, often necessitating surgical intervention requiring anesthesia.
M17.12: Unilateral primary osteoarthritis, left knee
- Represents chronic osteoarthritis in the left knee, relevant for procedures requiring anesthesia.
S83.241A: Sprain of medial collateral ligament of right knee, initial encounter
- Acute injury to the right knee's medial collateral ligament, commonly treated with surgical repair under anesthesia.
S83.242A: Sprain of medial collateral ligament of left knee, initial encounter
- Acute injury to the left knee's medial collateral ligament, may require anesthesia for surgical management.
M23.50: Chronic instability of knee, unspecified knee
- Describes ongoing instability in the knee, which can lead to surgical procedures necessitating anesthesia services.

Related CPT Codes

01320: Anesthesia for procedures on the knee and popliteal area
- Primary code for anesthesia services during knee or popliteal procedures.
01340: Anesthesia for procedures on the knee and popliteal area
- Related code that may be used for similar procedures. It can serve as an alternative or be used in conjunction with 01320 depending on the specific surgical intervention and anesthesia requirements.

Both codes are used in the clinical workflow for anesthesia during knee and popliteal area surgeries. Selection depends on the exact procedure performed and anesthesia technique required.

National Reimbursement Benchmarks

National mean rates for CPT code 01320 show that commercial payers (BUCA average) reimburse at $142.68, while Medicare rates are not available in the input. Among individual commercial payers, Cigna has the highest mean rate at $248.21, followed by Blue Cross Blue Shield at $232.08 and Aetna at $204.41. UnitedHealth Group is notably lower at $65.63.

Rate dispersion, measured by the difference between the 75th and 25th percentiles, varies significantly across payers. Aetna exhibits the widest spread ($320.00 - $41.00 = $279.00), indicating substantial variability in contracted rates. Blue Cross Blue Shield and Cigna also show considerable dispersion, with ranges of $105.68 and $259.00, respectively. UnitedHealth Group has the tightest range ($75.50 - $50.25 = $25.25), suggesting more consistent rates across providers.

The table and chart below present a detailed breakdown of national benchmarks for each payer, including mean rates and percentile values.

State Benchmarks

State: AK1 / 50

Alaska Benchmarks

Alaska shows a wide spread in reimbursement rates for CPT code 01320, with Blue Cross Blue Shield exhibiting the largest range between the 25th and 75th percentiles ($298.50 minus $225.80 = $72.70), while Aetna and UnitedHealth Group have minimal spread ($72.00 to $72.00 and $72.00 to $75.00, respectively). This indicates that some payers have tightly clustered rates, while others, like Blue Cross Blue Shield and BUCA, display more variability. Compared to national averages, Alaska's mean rates for most payers are higher, except for Cigna and UnitedHealth Group, which are notably lower than their respective national benchmarks.

The table and chart below present the full breakdown of mean rates and percentile distributions by payer for CPT code 01320 in Alaska, highlighting the significant differences in reimbursement across the major commercial payers.

Key Insights for Alaska

Blue Cross Blue Shield is the highest paying payer for CPT 01320 in Alaska, with a mean rate of $266.96.
UnitedHealth Group offers the lowest mean rate at $74.78, significantly below both state and national averages.
Cigna's mean rate in Alaska ($89.33) is much lower than its national mean ($248.21), indicating a substantial deviation.

Related Codes

01480

CPT 01480: Anesthesia for Lower Leg Bone Surgery

01502

CPT 01502: Anesthesia for Lower Leg Procedures, Inpatient Hospital

01214

CPT 01214: Anesthesia for Total Hip Arthroplasty

01270

CPT 01270: Anesthesia for Upper Leg Procedures (except knee)

01274

CPT 01274: Anesthesia for Upper Leg Artery Procedures, Bypass Graft & Embolectomy

01482

CPT 01482: Anesthesia for Radical Resection of Lower Leg, Ankle, and Foot

01404

CPT 01404: Anesthesia for Knee and Popliteal Area Procedures

01520

CPT 01520: Anesthesia for Procedures on the Lower Leg (Below Knee)

01215

CPT 01215: Anesthesia for Revision of Total Hip Arthroplasty

01756

CPT 01756: Anesthesia for Open or Arthroscopic Elbow Procedures

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Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.