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This page describes products and general use; it is not medical advice.
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A CIC (completely-in-canal) hearing aid is a hearing aid in a tiny case that sits nearly hidden in the ear canal. It is one of the two canal styles, alongside the in-the-canal (ITC) aid, and among the smallest styles available. This page is for clinic staff, buyers and students who want to know what the style is, what its small size trades away, and how it is regulated in the United States.
What a CIC hearing aid is
NIDCD, the hearing institute of the US National Institutes of Health, describes a completely-in-canal (CIC) hearing aid as one that is “nearly hidden in the ear canal.” The in-the-canal (ITC) aid, by contrast, is “made to fit the size and shape of a person’s ear canal.” The FDA describes both as “tiny cases that fit partly or completely into the ear canal” and as the smallest hearing aids available.
You may also see IIC (invisible-in-canal) used as a name for a canal style that sits deeper still. The FDA and NIDCD pages cited here do not define IIC, so it is treated only as a variant name and the points below are sourced to CIC and ITC.
How it differs from ITC and other styles
Canal aids put the whole device in a small case at the ear canal. Behind-the-ear (BTE) aids put the case behind the ear with tubing to an earmold, and in-the-ear (ITE) aids hold all parts in a shell that fills the outer part of the ear. The table compares only what the FDA and NIDCD state.
| Style | Placement and size | Handling and capacity noted by the source | Source |
|---|---|---|---|
| CIC | Nearly hidden in the ear canal; among the smallest styles available | May be difficult to adjust and remove; less space for batteries and extras such as a telecoil; reduced size limits power and volume | NIDCD; FDA |
| ITC | Made to fit the size and shape of the ear canal; fits partly into the canal | Same canal-aid size limits as CIC | NIDCD; FDA |
| ITE | All parts in a shell that fills the outer part of the ear; larger than ITC and CIC | May be easier to handle than smaller aids | FDA; NIDCD |
| BTE | Case behind the ear, connected by clear tubing to an earmold or earpiece | Easy to clean and handle; relatively sturdy | FDA |
Limits of a canal-size aid
Small size is the defining advantage and the defining constraint. The FDA says canal styles “offer cosmetic and some listening advantages” but that “their small size may make them difficult to handle and adjust.” NIDCD adds that canal aids have less space available for batteries and additional devices such as a telecoil, and that their reduced size limits power and volume.
Because room for a telecoil is limited, see the guide to the hearing aid telecoil. Behind-the-ear aids connect to a separate earmold; see earmold types. For a different device category, see hearing aid vs cochlear implant.
Regulatory status in the United States
Under 21 CFR 874.3300, an air-conduction hearing aid is “a wearable sound-amplifying device intended to compensate for impaired hearing” that conducts sound to the ear through the air. The regulation excludes group hearing aids, master hearing aids and tinnitus maskers. The device is Class I (general controls) and exempt from premarket notification procedures, subject to the limitations in 21 CFR 874.9. The openFDA classification record for product code ESD (“Hearing Aid, Air-Conduction, Prescription”) lists device class 1 and regulation number 874.3300 and describes it as a prescription hearing aid. CIC is a style within this class, not a separate regulatory category in these sources.
Care and upkeep
NIDCD notes that earwax or fluid can clog a hearing aid. For general upkeep items see hearing aid cleaning tools.
Common mistakes
- Treating CIC, ITC and IIC as separate regulated products. In the cited sources they are styles of one device class.
- Expecting canal aids to carry every feature. NIDCD notes less space for batteries and a telecoil.
FAQ
What does CIC stand for in hearing aids?
Completely-in-canal. NIDCD describes it as a hearing aid that is nearly hidden in the ear canal.
What is the difference between a CIC and an ITC hearing aid?
Both are canal aids. The ITC is made to fit the size and shape of the ear canal and fits partly into it; the CIC sits nearly hidden in the canal, according to NIDCD and the FDA.
What is the difference between CIC and IIC?
IIC (invisible-in-canal) is commonly used as a name for a canal style that sits deeper still. The FDA and NIDCD pages cited here do not define it, so this page makes no further claims about it.
Is a CIC hearing aid a medical device?
Yes. In the US, air-conduction hearing aids are regulated by the FDA under 21 CFR 874.3300 as Class I devices, and product code ESD covers the prescription type.
Sources
- FDA, Types of Hearing Aids (https://www.fda.gov/medical-devices/hearing-aids/types-hearing-aids), checked 2026-10-30.
- NIDCD (NIH), Hearing Aids (https://www.nidcd.nih.gov/health/hearing-aids), checked 2026-10-30.
- 21 CFR 874.3300, Air-conduction hearing aid (Cornell LII) (https://www.law.cornell.edu/cfr/text/21/874.3300), checked 2026-10-30.
- openFDA device classification, product code ESD, API record (https://api.fda.gov/device/classification.json?search=product_code:ESD), last updated 2026-10-19, checked 2026-10-30.
