Addendum to Medical Record
A signed and dated note added to a medical record after the original encounter to clarify or supplement documentation.
1 min read · Last reviewed May 23, 2026
At a glance
- Category
- Documentation
- Primary sources
- 1
- Workspace handoff
- templates →
Where this comes up
Providers meet this term in the chart and at the post-visit review — encounter notes, problem lists, medication reconciliation, signed orders, and the time/elements that defend the billed code. If documentation does not support the code, the code does not survive an audit.
Full definition
What it is in practice
CMS accepts addenda when properly dated, timed, and signed. The addendum must be clearly identified as such and must not alter the original.
How it shows up in your practice
Use the EHR's addendum feature, never edit a signed note in place. Document the reason for the addendum.
Sources
- CMS — Signature Requirementshttps://www.cms.gov/outreach-and-education/medicare-learning-network-mln/mlnproducts/downloads/signature_requirements_fact_sheet_icn905364.pdf
Generate addenda from the Templates engine
Open templates →Related terms
- DocumentationSignature RequirementsMedicare's requirements that medical records be authenticated by the author with a handwritten or electronic signature.
- DocumentationSOAP NoteSubjective, Objective, Assessment, and Plan — the four-part structured clinical note format used in most ambulatory encounters.
- Denials & AppealsAudit DefenseThe organized process of preparing for and responding to a payer or government audit.
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
- GlossarySignature RequirementsMedicare's requirements that medical records be authenticated by the author with a handwritten or electronic signature.
- GlossarySOAP NoteSubjective, Objective, Assessment, and Plan — the four-part structured clinical note format used in most ambulatory encounters.
- GlossaryAudit DefenseThe organized process of preparing for and responding to a payer or government audit.
- GlossaryLate EntryA documented entry made into the medical record after the time of service when documentation at the time of service was not possible.
- GlossaryDesignated Health Service (DHS)Categories of services subject to the physician self-referral prohibition under the Stark Law.
- GlossaryDocumentation CloningThe practice of copying prior or template-generated documentation into a new encounter note without updating it for the current visit.
- GlossaryDocumentation SpecificityThe level of detail in clinical documentation needed to support the diagnosis and service codes reported.
- GlossaryE-Prescribing of Controlled Substances (EPCS)DEA-regulated electronic prescribing of Schedule II-V controlled substances.
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.