Summary & Overview
CPT 01991: Anesthesia for Nerve Blocks and Injections (Non-Prone Position)
CPT code 01991 represents anesthesia services for diagnostic or therapeutic nerve blocks and injections, when the block or injection is performed by a different provider and the patient is not in the prone position. This code is significant for ensuring proper billing and documentation of anesthesia care in outpatient surgical settings, particularly Ambulatory Surgical Centers. Nationally, the code is relevant for a range of pain management and musculoskeletal procedures, supporting accurate reimbursement and compliance across multiple specialties.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, and UnitedHealthcare. The publication provides an overview of payer coverage, clinical context, and policy benchmarks related to 01991. Readers will gain insights into the typical use cases for this code, associated clinical diagnoses, and related procedural codes. The summary also highlights common modifiers and taxonomies relevant to anesthesia and pain medicine, offering a comprehensive view of how 01991 fits into broader medical billing and clinical workflows. This information is valuable for understanding national trends in anesthesia billing for nerve block and injection procedures.
CPT Code Overview
CPT code 01991 is used to report anesthesia services provided for diagnostic or therapeutic nerve blocks and injections, specifically when the block or injection is performed by a different provider. This code applies to procedures conducted in positions other than the prone position. The typical site of service for this anesthesia procedure is an Ambulatory Surgical Center (POS 24), reflecting its use in outpatient surgical settings. This code is essential for accurately documenting and billing anesthesia care associated with nerve block and injection procedures performed by separate healthcare professionals.
Clinical & Coding Specifications
Clinical Context
A patient presents to an ambulatory surgical center with chronic low back pain that has not responded to conservative management. The pain medicine specialist evaluates the patient and determines that a diagnostic or therapeutic nerve block is indicated. The procedure is performed by a pain medicine physician, while an anesthesiology provider administers anesthesia for the nerve block. The patient is positioned supine (not prone) for the injection. The anesthesia provider monitors the patient throughout the procedure, ensuring comfort and safety, and documents the anesthesia care provided. This workflow is typical for procedures coded with 01991 in settings such as ambulatory surgical centers.
Coding Specifications
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Modifiers:
Modifier Code Description Usage Context QSMonitored anesthesia care service Used when anesthesia care is monitored during the procedure P1A normal healthy patient Indicates the patient is normal and healthy (ASA Physical Status 1) -
Provider Taxonomies:
Taxonomy Code Specialty Name 207L00000XAnesthesiology 207LP2900XPain Medicine 207RA0401XAnesthesiology Assistant -
Specialties Represented:
- Anesthesiology: Providers specializing in anesthesia care.
- Pain Medicine: Providers focusing on pain management procedures.
- Anesthesiology Assistant: Qualified assistants in anesthesia delivery.
Related Diagnoses
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M54.5- Low back pain- Relevant for patients undergoing nerve blocks or injections to manage chronic low back pain.
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G89.29- Other chronic pain- Indicates chronic pain conditions that may require interventional pain procedures with anesthesia.
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M25.561- Pain in right knee- Used when the procedure targets pain in the right knee, such as joint injections.
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M25.562- Pain in left knee- Used for procedures addressing pain in the left knee.
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M54.2- Cervicalgia- Indicates neck pain, which may be managed with nerve blocks or injections requiring anesthesia.
Each diagnosis code is clinically relevant as it represents the pain condition being treated with nerve blocks or injections, for which anesthesia services are provided and coded with 01991.
Related CPT Codes
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64450- Injection, anesthetic agent; other peripheral nerve or branch- Used for peripheral nerve blocks, which may require anesthesia services as described by
01991.
- Used for peripheral nerve blocks, which may require anesthesia services as described by
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20610- Arthrocentesis, aspiration and/or injection into a major joint or bursa- May be performed for joint pain; anesthesia for this injection can be coded with
01991if provided by a different provider.
- May be performed for joint pain; anesthesia for this injection can be coded with
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62322- Injection(s), of diagnostic or therapeutic substance(s) (e.g., anesthetic, antispasmodic, opioid, steroid)- Spinal injections for pain management; anesthesia for these procedures may be reported with
01991.
- Spinal injections for pain management; anesthesia for these procedures may be reported with
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64483- Injection(s), anesthetic agent and/or steroid, transforaminal epidural; lumbar or sacral, single level- Commonly performed for lumbar or sacral pain; anesthesia for this injection is coded with
01991when performed by a separate provider.
- Commonly performed for lumbar or sacral pain; anesthesia for this injection is coded with
Clinical Workflow Relation:
- These codes represent the nerve block or injection procedures for which anesthesia is provided and coded with
01991. 01991is used when the anesthesia provider is different from the procedural provider.- Codes such as
64450,62322, and64483are commonly used together with01991in pain management settings.
National Reimbursement Benchmarks
National mean rates for CPT code 01991 show that commercial payers such as Blue Cross Blue Shield, Aetna, Cigna, and BUCA (average commercial) generally reimburse at higher levels than UnitedHealth Group. Cigna has the highest mean rate at $197.88, while UnitedHealth Group is the lowest among the listed payers at $65.59. The BUCA mean rate of $108.60 is notably higher than UnitedHealth Group, but lower than the other commercial payers.
Rate dispersion, measured by the difference between the 75th and 25th percentiles, varies significantly across payers. Aetna exhibits the widest spread ($188.83), indicating substantial variability in rates, while UnitedHealth Group has the tightest range ($25.08), suggesting more consistent reimbursement levels. Cigna and BUCA also show considerable dispersion, with ranges of $173.00 and $95.25, respectively. Blue Cross Blue Shield's range is $79.50, reflecting moderate variability.
The table and chart below present a detailed breakdown of national benchmarks for CPT code 01991 by payer, including mean rates and percentile values.
State Benchmarks
State: AK1 / 50
Alaska Benchmarks
Alaska demonstrates a substantial rate spread for CPT code 01991, particularly with Blue Cross Blue Shield, where the difference between the 75th and 25th percentiles is $89.47 ($266.67 minus $177.20). BUCA also shows a wide spread of $93.60, while Aetna and UnitedHealth Group have minimal spreads, indicating more consistent rates. Compared to national averages, Alaska's mean rates for most payers are significantly higher, especially for Blue Cross Blue Shield and BUCA, highlighting a premium market for this code in the state.
The table and chart below present the full breakdown of mean rates and percentile distributions for each payer in Alaska, allowing for a clear comparison of reimbursement levels across the major commercial insurers.
Key Insights for Alaska
- Blue Cross Blue Shield is the highest paying payer for CPT 01991 in Alaska, with a mean rate of $218.62.
- UnitedHealth Group offers the lowest mean rate at $74.78.
- Alaska's mean rates for most payers are notably higher than national averages, especially for Blue Cross Blue Shield and BUCA.
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