HCPCS Level II E2331: Power Wheelchair Attendant Proportional Control

HCPCS Level II code E2331 designates a proportional attendant control accessory for power wheelchairs, encompassing the attendant control interface, associated electronics, and fixed mounting hardware. This accessory allows a caregiver or attendant to provide proportional steering and speed control of a power wheelchair, which can be essential for patients who require assistance with mobility but still benefit from precise, graduated control rather than simple binary commands. Nationally, coverage and payment for such accessories affect access to mobility and functioning for beneficiaries who rely on power wheelchairs.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the code’s clinical role and typical use settings, summaries of payer coverage considerations, and context for billing workflows and documentation expectations. The publication also outlines common modifiers and billing practices associated with durable medical equipment accessories, and highlights benchmarking and policy update themes relevant to DME suppliers and billing teams.

This material is written for a national audience and focuses on the code definition, payer coverage landscape, and operational implications for suppliers and clinicians who document need and submit claims for power wheelchair accessories using E2331.

Billing Code Overview

HCPCS Level II code E2331 describes a power wheelchair accessory: an attendant control, proportional, including all related electronics and fixed mounting hardware. The accessory enables an attendant to operate a power wheelchair with variable (proportional) control inputs rather than fixed on/off commands.

Service Type: Durable Medical Equipment accessory — mobility/assistive device control

Typical Site of Service: Home or community settings where power wheelchairs are used; supplied through DME providers and dispensed where the wheelchair is located

Clinical Context

A 72-year-old patient with advanced Parkinson disease and progressive mobility impairment is evaluated by a durable medical equipment (DME) supplier and the treating physiatrist for a power wheelchair. The patient requires an attendant-operated control to allow a caregiver to safely maneuver the chair when the patient cannot reliably operate the joystick. The physiatrist documents functional limitation, risk of falls, and the caregiver training plan. The DME supplier identifies the need for an attendant control accessory that is proportional and includes associated electronics and fixed mounting hardware. The workflow includes physician assessment and documentation of medical necessity, DME supplier product selection and order, prior authorization submission to the patient’s insurer (for example, Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, BUCA, Medicare), product delivery, caregiver training on use and safety, and post-delivery follow-up to confirm fit and function. Billing uses HCPCS Level II code E2331 for the attendant control accessory with adjunct documentation of power wheelchair base and seating system details in the patient record.

Coding Specifications

Modifier	Description	When to Use
`52`	Reduced services	Use when the attendant control is provided with limited components or reduced functionality compared with standard product ordered.

Taxonomy Code	Specialty	Notes
`224100000X`	Physical Medicine & Rehabilitation Physician	Often documents functional assessment and medical necessity for complex mobility aids.
`251B00000X`	Physical Therapist	Performs mobility assessment, seating/positioning recommendations, and caregiver training.
`3336C0003X`	Durable Medical Equipment Supplier	Supplies, fits, and installs power wheelchair accessories and provides training.
`2084P0800X`	Occupational Therapist	Evaluates activities of daily living and recommends attendant-operated controls when needed.
`363L00000X`	Medical Equipment Supplier	Alternative taxonomy used by organizations specializing in mobility equipment.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G20`	Parkinson disease	Progressive motor impairment and postural instability may necessitate attendant-operated controls for safety.
`G82.50`	Paraplegia, unspecified	Significant motor impairment of lower extremities requiring power wheelchair with attendant control.
`G83.4`	Cauda equina syndrome	Neurologic deficits with impaired ambulation that often require powered mobility solutions.
`M62.81`	Muscle weakness (generalized)	Generalized weakness limiting independent wheelchair operation; attendant control provides caregiver operation.
`R26.2`	Difficulty in walking, not elsewhere classified	Functional ambulation deficits supporting need for power mobility with attendant control.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97161`	Physical therapy evaluation, low complexity	Performed prior to ordering to document mobility limitations and need for device recommendations.
`97530`	Therapeutic activities, direct one-on-one patient contact	May be used for training the patient/caregiver in safe transfer and mobility with the power wheelchair.
`97755`	Assistive technology assessment; review/coordinate use of assistive technology	Directly documents device selection, configuration, and training related to the attendant control.
`99070`	Supplies and materials (except spectacles), provided by the physician over and above those usually included	Occasionally used to bill for minor supplies used during fitting or installation when allowed by payer.
`99456`	Work-related or medical disability examination services (use as appropriate)	Used only when formal documentation for disability evaluation is required in conjunction with mobility equipment recommendations.

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Summary & Overview