42 CFR § 512.325 - Participant selection and geographic areas.

---
identifier: "/us/cfr/t42/s512.325"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "42 CFR § 512.325 - Participant selection and geographic areas."
title_number: 42
title_name: "Public Health"
section_number: "512.325"
section_name: "Participant selection and geographic areas."
chapter_name: "CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "H"
subchapter_name: "HEALTH CARE INFRASTRUCTURE AND MODEL PROGRAMS"
part_number: "512"
part_name: "STANDARD PROVISIONS FOR MANDATORY INNOVATION CENTER MODELS AND SPECIFIC PROVISIONS FOR CERTAIN MODELS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 1302, 1315a, and 1395hh."
regulatory_source: "85 FR 61362, Sept. 29, 2020, unless otherwise noted."
cfr_part: "512"
---


# 512.325 Participant selection and geographic areas.

(a) *Selected participants.* All Medicare-certified ESRD facilities and Medicare-enrolled Managing Clinicians located in a selected geographic area are required to participate in the ETC Model.

(b) *Selected Geographic Areas.* CMS establishes the Selected Geographic Areas by selecting all HRRs for which at least 20 percent of the component zip codes are located in Maryland, and a random sample of 30 percent of HRRs, stratified by Census-defined regions (Northeast, South, Midwest, and West). CMS excludes all U.S. Territories from the Selected Geographic Areas.