1820 was a leap year starting on Saturday of the Gregorian calendar and a leap year starting on Thursday of the Julian calendar, the 1820th year of the Common Era (CE) and Anno Domini (AD) designations, the 820th year of the 2nd millennium, the 20th year of the 19th century, and the 1st year of the 1820s decade. As of the start of 1820, the Gregorian calendar was 12 days ahead of the Julian.

TABLE OF CONTENTS OF TITLE^[2]

1. The category is for articles and events specifically related to the decade of the 1820s which begins in the year 1820 and ends in the year 1829.
2. References in Text. The Investment Company Act of 1940, referred to in subsec.(d)(6), is title I of act Aug. 789, as amended, which is classified generally to subchapter I (§ 80a–1 et seq.) of chapter 2D of Title 15, Commerce and Trade.For complete classification of this Act to the Code, see section 80a–51 of Title 15 and Tables.

Part A—Hospital Insurance Benefits for the Aged andDisabled

Part B—Supplementary Medical Insurance Benefits forthe Aged and Disabled

[Sec. 1845. Repealed.]

Part C—Medicare+Choice Program

Part D—Voluntary Prescription Drug Benefit Program

Subpart 1—Part D Eligible Individuals and PrescriptionDrug Benefits

Subpart 2—Prescription Drug Plans; PDP Sponsors; Financing

Subpart 3—Application to Medicare Advantage Program andTreatment of Employer-Sponsored Programs and Other Prescription DrugPlans

Subpart 4—Medicare Prescription Drug Discount Card andTransitional Assistance Program