Transmission Security
Technical security measures to guard against unauthorized access to ePHI that is being transmitted over an electronic communications network.
1 min read · Last reviewed May 23, 2026
At a glance
- Category
- Security
- Primary sources
- 3
- Workspace handoff
- compliance binder →
Where this comes up
This sits inside the security risk analysis under 45 CFR 164.308(a)(1)(ii)(A) — workstation controls, EHR access roles, ePHI transmission encryption, audit logging, vendor risk, and incident response. Reviewers expect dated evidence of the control, not a policy PDF that says it exists.
Full definition
What it is in practice
45 CFR 164.312(e) requires transmission security, with integrity controls (addressable) and encryption (addressable). TLS 1.2+, SFTP/SCP, and HIPAA-aware email gateways are the standard implementations.
How it shows up in your practice
Inventory the channels carrying ePHI: fax, email, EHR portal, claims clearinghouse, lab interfaces. Document the protection for each.
Sources
- 45 CFR 164.312 — Technical safeguardshttps://www.ecfr.gov/current/title-45/section-164.312
- HHS — HIPAA Security Rulehttps://www.hhs.gov/hipaa/for-professionals/security/index.html
- NIST SP 800-66 Rev. 2 — HIPAA Security Rule Implementation Guidehttps://csrc.nist.gov/pubs/sp/800/66/r2/final
Document transmission channels in the Compliance Binder
Open compliance binder →Related terms
- SecurityEncryption in TransitCryptographic protection of ePHI moving between systems or networks, typically via TLS.
- SecurityTechnical SafeguardsTechnology and the policy and procedures for its use that protect ePHI and control access to it.
- SecurityTransmission SecurityTechnical security measures to guard against unauthorized access to ePHI that is being transmitted over an electronic communications network.
D3rx is a healthcare-billing and compliance research aid maintained by D3rx Inc. Articles are drafted by an LLM (Anthropic Claude) against primary HHS, OCR, CMS, eCFR, NIST, and state-regulator publications, and reviewed for restraint and source fidelity by the D3rx team.
Reviewer status: a named credentialed reviewer (CHC, CHPC, or healthcare attorney) is being engaged. Until that engagement is finalized, this page does not claim credentialed review.
Related across the archive
- GlossaryEncryption in TransitCryptographic protection of ePHI moving between systems or networks, typically via TLS.
- GlossaryTechnical SafeguardsTechnology and the policy and procedures for its use that protect ePHI and control access to it.
- GlossaryHIPAA Security RuleThe federal regulation at 45 CFR Part 164 Subpart C that requires safeguards for ePHI.
- GlossaryAccess ControlsTechnical policies and procedures that allow only authorized persons or software programs to access ePHI.
- GlossaryAdministrative SafeguardsPolicies and procedures designed to manage the selection, development, implementation, and maintenance of security measures protecting ePHI.
- ComplianceAnnual HIPAA Training Curriculum (What to Cover + How to Document)A 2026 annual HIPAA training curriculum for small healthcare practices — eight required modules under 45 CFR 164.530(b) and 45 CFR 164.308(a)(5), with documentation templates.
- RegulationNIST Cybersecurity Framework 2.0The 2024 update to the NIST CSF added the Govern function alongside Identify, Protect, Detect, Respond, and Recover — providing a common language for organizational cybersecurity risk management.
- SRAHIPAA Contingency Plan for a Small PracticeWhat the Security Rule contingency plan standard at 45 CFR 164.308(a)(7) actually requires, including data backup, disaster recovery, emergency mode operation, and testing — for a small practice.
This glossary entry is a research aid for billing and compliance staff. It does not provide legal, medical, or financial advice and does not replace counsel. References cited link to primary sources at HHS, OCR, CMS, eCFR, NIST, and the relevant payer or industry body.