Changes to the ICD-10-CM Official Guidelines for Coding and Reporting

FY 2027—UPDATED October 1, 2026 (October 1, 2026—September 30, 2027) A summary of the modifications to the ICD-10-CM Official Guidelines for Coding and Reporting are included below. The complete guidelines may be downloaded by visiting https://www.cdc.gov/nchs/icd/icd-10-cm/files.html The modifications are published below using the following format: Narrative changes appear in bold text. Items underlined have been moved within the guidelines since the April 2026, FY 2026 version. Italics are used to indicate revisions to heading changes Section I. Conventions, general coding guidelines and chapter specific guidelines C. Chapter-Specific Coding Guidelines   9. Chapter 9: Diseases...

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Note:  The following article synopsis was NOT provided by the AHA. It was created by Find-A-Code/innoviHealth.

Article Overview

The article presents a summary of FY 2027 modifications, effective October 1, 2026 through September 30, 2027. It covers selected guidance related to circulatory conditions, newborn observation, congenital and genetic conditions, health-status factors, and present-on-admission reporting.

Why This Topic Matters

The summary helps readers identify which guideline areas were revised for FY 2027 and whether the changes relate to their coding or health information work.

Article Sections

  1. Section I. Conventions, general coding guidelines and chapter specific guidelines

    Introduces the guideline section containing the chapter-specific updates summarized in the article.

  2. C. Chapter-Specific Coding Guidelines

    Groups the updates by ICD-10-CM chapter and related guideline topic.

  3. Chapter 9: Diseases of the Circulatory System

    Covers a chapter-specific update concerning circulatory-system guidance.

  4. Hypertension

    Focuses on the hypertension topic within the circulatory-system guidance.

  5. Hypertensive Crisis

    Addresses the guideline topic of hypertensive crisis.

  6. Chapter 16: Certain Conditions Originating in the Perinatal Period

    Covers guidance concerning newborn observation and evaluation.

  7. Observation and Evaluation of Newborns for Suspected Conditions not Found

    Addresses newborn observation and evaluation when a suspected condition is not found.

  8. On other than the birth record

    Covers the guideline topic in the context of records other than the birth record.

  9. Chapter 17: Congenital malformations, deformations, and chromosomal abnormalities, and genetic disorders

    Summarizes updates concerning congenital, chromosomal, and genetic conditions.

  10. Chapter 21: Factors influencing health status and contact with health services

    Covers selected updates involving health-status factors and contact with health services.

  11. Categories of Z codes

    Organizes the chapter 21 material by categories of health-status and history codes.

  12. History (of)

    Covers history-related categories within the chapter 21 material.

  13. Miscellaneous Z Codes

    Covers additional health-status topics addressed in the chapter 21 update.

  14. Appendix I

    Introduces the appendix material on present-on-admission reporting.

  15. Present on Admission Reporting Guidelines

    Covers a selected update to present-on-admission reporting guidance.

  16. Assigning the POA Indicator

    Addresses the guideline topic of assigning the present-on-admission indicator.

What You Will Learn

  • Which broad ICD-10-CM guideline areas are addressed in the FY 2027 update summary.
  • How the article organizes updates across chapter-specific guidance and an appendix.
  • Which topics are included in the present-on-admission reporting update.
  • intended_audiences

Who Should Read This

  • Medical coders
  • Health information management professionals
  • Medical billing and compliance professionals
  • Healthcare educators and researchers

Codes Discussed

Code Ranges Discussed

  • ICD-10-CM: I00-I99
  • ICD-10-CM: I10-I15
  • ICD-10-CM: P00-P96
  • ICD-10-CM: Q00-QA1
  • ICD-10-CM: Z00-Z99
  • ICD-10-CM: Z28.3-
  • ICD-10-CM: Z91.4-
  • ICD-10-CM: Z91.5-
  • ICD-10-CM: Z91.1-

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