A7046 - Replacement water chamber for CPAP/BiPAP humidifier

Healthcare Common Procedure Coding System

Last updated: 10/3/2025

What is a HCPCS Code?

HCPCS (Healthcare Common Procedure Coding System) codes are used to identify medical procedures, supplies, and services for billing purposes. These codes help standardize how healthcare services are reported and billed across different providers and insurance companies.

Detailed Description

This code covers the cost of a replacement water chamber (tank) that is part of a humidifier system used with positive airway pressure devices like CPAP or BiPAP machines. The water chamber holds water that gets heated to add moisture to the air you breathe through your sleep apnea device, making therapy more comfortable. This is a single replacement unit when your current water chamber needs to be replaced due to wear, damage, or medical necessity.

Additional Information

Water chambers typically need replacement every 6-12 months or as recommended by your healthcare provider. Always use distilled water in the chamber to prevent mineral buildup and ensure proper function.

Category

Durable Medical Equipment Supplies

Medical Specialty

Sleep Medicine/Pulmonology

Expected Costs

We expect this to normally be in the range of:

$15 - $50

This is an estimate based on typical billing patterns. Your actual cost may vary depending on your insurance coverage, provider location, and specific circumstances.

What's Required Before This

  • Prescription for positive airway pressure therapy
  • Compatible humidifier system

What to Expect After

  • Regular cleaning and maintenance of water chamber
  • Periodic replacement as recommended by manufacturer or physician

Why Understanding This Code Matters

On Your Medical Bill

This code appears on your medical bills to identify the specific service, procedure, drug, or medical diagnosis you received. Understanding what it means helps you verify you're being charged correctly and know what to expect.

For Your Health

Knowing what this code represents helps you understand your treatment plan, ask better questions during appointments, and track your healthcare journey more effectively.

Want This Level of Detail on All Your Claims?

Get detailed explanations for every medical code on your Medicare bills. Currently supporting Medicare only.