Title 21 presents regulations promulgated by the Food and Drug Administration, the Drug Enforcement Administration, and the Office of the National Drug Control Agency in the area of food and drugs. These regulations encompass food and drugs for human and animal use, biologics, cosmetics, medical devices, radiological health, and controlled substances. Additions and revisions to this section of the code are posted annually by April. Publication follows within six months.

Title 22 presents regulations governing the Department of State, the International Development Cooperation Agency, the Peace Corps, and other federal agencies regarding foreign relations. It includes regulations pertaining to Foreign Service personnel, visas, nationality and passports, diplomatic privileges and immunities, and international agreements. Additions and revisions to this section of the code are posted annually by April. Publication follows within six months.

Title 10 presents regulations governing energy resources; nuclear, oil, alternative fuels, and natural gas; energy sales; and energy conservation.

Title 26 presents regulations, procedures, and practices that govern income tax, estate and gift taxes, employment taxes, and miscellaneous excise taxes as set forth by the Internal Revenue Service. Additions and revisions to this section of the code are posted annually by April. Publication follows within six months.

Title 9 presents regulations governing animal and plant health inspection services, grain inspection, packers and stockyard administration, and food safety and inspection of meat and poultry. Additions and revisions to this section of the code are posted annually by January. Publication follows within six months.

Title 42 presents regulations that apply to: medical personnel; medical care and examinations; health related grants; fellowships, internships, and training; quarantine, inspection, and licensing; occupational safety and health research; health assessments; vaccines; Medicare and medical assistance programs; and standards and certification of facilities and services. Additions and revisions to this section of the code are posted annually by October. Publication follows within six months.

Title 42 presents regulations that apply to: medical personnel; medical care and examinations; health related grants; fellowships, internships, and training; quarantine, inspection, and licensing; occupational safety and health research; health assessments; vaccines; Medicare and medical assistance programs; and standards and certification of facilities and services. Additions and revisions to this section of the code are posted annually by October. Publication follows within six months.