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21st Century Cures Act — information blocking explained

The short answer: The 21st Century Cures Act information-blocking rule (45 CFR Part 171) prohibits healthcare providers, IT developers, and HIEs / HINs from engaging in practices that interfere with the access, exchange, or use of electronic health information. The rule is enforced by ONC and OIG, with civil monetary penalties up to $1 million per violation for IT developers and HIEs and disincentives for providers. Exceptions allow legitimate reasons to limit disclosure.

Chad Campbell
Chad Campbell · AVP, Compliance & Transitions· Reviewed 2026-05-15

Key takeaways

  • Prohibits interference with EHI access, exchange, and use
  • Applies to providers, IT developers, and HIEs / HINs
  • CMPs up to $1M per violation for IT developers and HIEs; disincentives for providers
  • Eight exceptions allow legitimate reasons to limit disclosure
  • USCDI v3 defines the scope of EHI in the near term; full EHI definition applies long term

The numbers

$1M
Civil monetary penalty per violation (IT developers, HIEs)
ONC
8 exceptions
Permitted practices under the rule
45 CFR Part 171
USCDI v3
Near-term scope of EHI
ONC

The eight exceptions

The rule provides eight exceptions to information blocking — practices that would otherwise look like blocking but are permitted because they serve a legitimate purpose. Examples: preventing harm, privacy, security, infeasibility, content and manner, licensing, fees, and health IT performance.

Frequently asked questions

What is information blocking under the 21st Century Cures Act?

A practice — except as required by law or covered by an exception — that interferes with the access, exchange, or use of electronic health information. The rule applies to providers, health IT developers, and HIEs / HINs.

What are the penalties for information blocking?

For IT developers and HIEs / HINs: civil monetary penalties up to $1 million per violation, enforced by OIG. For providers: disincentives administered by CMS (such as reduced Medicare promoting interoperability score). Eight exceptions allow legitimate reasons to limit disclosure.

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