21 CFR § 890.5100 - Immersion hydrobath.
---
identifier: "/us/cfr/t21/s890.5100"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 890.5100 - Immersion hydrobath."
title_number: 21
title_name: "Food and Drugs"
section_number: "890.5100"
section_name: "Immersion hydrobath."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "H"
subchapter_name: "MEDICAL DEVICES"
part_number: "890"
part_name: "PHYSICAL MEDICINE DEVICES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 351, 360, 360c, 360e, 360j, 360 371."
regulatory_source: "48 FR 53047, Nov. 23, 1983, unless otherwise noted."
cfr_part: "890"
---
# 890.5100 Immersion hydrobath.
(a) *Identification.* An immersion hydrobath is a device intended for medical purposes that consists of water agitators and that may include a tub to be filled with water. The water temperature may be measured by a gauge. It is used in hydrotherapy to relieve pain and itching and as an aid in the healing process of inflamed and traumatized tissue, and it serves as a setting for removal of contaminated tissue.
(b) *Classification.* Class II (special controls). The device, when it is a hydromassage bath or a powered sitz bath, is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 890.9.
[48 FR 53047, Nov. 23, 1983, as amended at 84 FR 71818, Dec. 30, 2019]