42 CFR § 424.505 - Basic enrollment requirement.

---
identifier: "/us/cfr/t42/s424.505"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "42 CFR § 424.505 - Basic enrollment requirement."
title_number: 42
title_name: "Public Health"
section_number: "424.505"
section_name: "Basic enrollment requirement."
chapter_name: "CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "B"
subchapter_name: "MEDICARE PROGRAM"
part_number: "424"
part_name: "CONDITIONS FOR MEDICARE PAYMENT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 1302 and 1395hh."
regulatory_source: "53 FR 6634, Mar. 2, 1988, unless otherwise noted."
cfr_part: "424"
---


# 424.505 Basic enrollment requirement.

To receive payment for covered Medicare items or services from either Medicare (in the case of an assigned claim) or a Medicare beneficiary (in the case of an unassigned claim), a provider or supplier must be enrolled in the Medicare program. Except for those suppliers that complete the CMS-855O form or CMS-identified equivalent, successor form or process for the sole purpose of obtaining eligibility to order or certify Medicare-covered items and services; once enrolled the provider or supplier receives billing privileges and is issued a valid billing number effective for the date a claim was submitted for an item that was furnished or a service that was rendered. (See 45 CFR part 162 for information on the National Provider Identifier and its use as the Medicare billing number.)

[71 FR 20776, Apr. 21, 2006, as amended at 79 FR 72531, Dec. 5, 2014]