---
kind: "unit"
title: "21"
title_heading: "Food and Drugs"
key: "chI/subchI"
level: "subchap"
label: "Subchapter I"
heading: "Mammography Quality Standards Act"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/21/chI-subchI"
sections_count: 23
---

# Subchapter I — Mammography Quality Standards Act

Title 21 C.F.R. — Food and Drugs › Chapter I — Food and Drug Administration, Department of Health and Human Services

## Contents

- [Part 900 — Mammography](/cfr/21/chI-subchI-part900.md)