icd10cm

is a Ontology.

It is part of the OMOP collection.

ICD-10-CM (International Classification of Diseases, 10th Revision, Clinical Modification) is a clinical modification of the WHO's ICD-10 system, providing diagnostic codes used for billing, epidemiology, and health management in the United States, with greater specificity than the international version.

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Domains

clinical, biomedical, clinical coding

License

Public Domain

Homepage

icd10cm

Repository

Unknown

External IDs
  • Infores: infores:icd10cm

Product Summary

Products

From this Resource
ID Name URL Category Format Description
icd10cm.tool ICD-10-CM Browser Tool icd10cmtool.cdc.gov Graphical Interface http Interactive web-based search tool for...
From other Resources
ID Name URL Category Format Relation Description
athena.mappings ⚠ Athena Concept Mappings start Mapping csv had primary source Concept mappings between different te...
athena.vocabularies ⚠ Athena Vocabulary Downloads list Product csv had primary source Downloadable standardized vocabulary ...
sri-reference-kg.graph SRI-Reference KG (KGX distribution) monarch-kg.tar.gz (219.4 MB) Graph kgx had primary source KGX distribution of the SRI-Reference KG
imo-knowledge-graph.data ⚠ IMO Health Knowledge Graph Content knowledge-graph Product http was derived from The proprietary clinical knowledge gr...

Details

ICD-10-CM

Overview

ICD-10-CM (International Classification of Diseases, 10th Revision, Clinical Modification) is the United States’ clinical modification of the World Health Organization’s ICD-10 system. It provides a standardized system of diagnostic codes used throughout the US healthcare system for billing, epidemiological tracking, health management, and clinical documentation.

Key Features

  • Greater Specificity: More detailed codes than the international ICD-10 version
  • Clinical Detail: Enhanced to capture clinical concepts important to US healthcare
  • Laterality: Specifies left, right, or bilateral for paired organs
  • Episode of Care: Indicates initial encounter, subsequent encounter, or sequela
  • Combination Codes: Single codes for frequently co-occurring conditions
  • Regular Updates: Annual updates to reflect new diseases and clinical advances

Structure

ICD-10-CM codes consist of 3-7 alphanumeric characters:

  • First character: Alphabetic (A-Z)
  • Second character: Numeric (0-9)
  • Characters 3-7: Alphanumeric providing additional specificity
  • 7th character: Extension for encounter type (initial, subsequent, sequela)

Code Categories

Disease Index

Diagnostic codes organized by disease entity, covering:

  • Infectious and parasitic diseases
  • Neoplasms
  • Diseases of body systems
  • Congenital malformations
  • Symptoms and abnormal findings

External Causes

Codes for injuries and external causes including:

  • Accidents and injuries
  • Environmental factors
  • Activity codes
  • Place of occurrence

Drugs and Chemicals

Codes for:

  • Poisoning by drugs and chemicals
  • Adverse effects
  • Underdosing

Neoplasms

Detailed neoplasm codes organized by:

  • Anatomical site
  • Behavior (malignant, benign, uncertain, unspecified)

Applications

  • Medical Billing: Required for health insurance claims in the US
  • Epidemiology: Tracking disease patterns and public health surveillance
  • Health Statistics: Population health reporting and research
  • Clinical Documentation: Standard terminology for medical records
  • Quality Measurement: Healthcare quality metrics and reporting
  • Resource Allocation: Health planning and management
  • Research: Clinical and health services research

Integration

ICD-10-CM is integrated into:

  • Electronic Health Record (EHR) systems
  • Medical billing software
  • Public health surveillance systems
  • Clinical decision support tools
  • Athena (OHDSI vocabulary mappings)
  • Terminology mapping services
  • Knowledge graphs (UBKG)

Maintenance

ICD-10-CM is maintained by:

  • National Center for Health Statistics (NCHS): Part of the CDC
  • Centers for Medicare & Medicaid Services (CMS)

Annual updates are released on October 1st each fiscal year.

Access

  • CDC ICD-10-CM Tool: Interactive browser at https://icd10cmtool.cdc.gov/
  • FTP Downloads: Code files, guidelines, and documentation
  • Mapping Files: Crosswalks to ICD-9-CM and other terminologies
  • ICD-10: International version (less detailed)
  • ICD-10-PCS: Procedure Coding System (used with ICD-10-CM for inpatient procedures)
  • SNOMED CT: More granular clinical terminology
  • ICD-11: Next generation (not yet adopted in US)

Compliance

ICD-10-CM has been mandatory for all HIPAA-covered entities in the United States since October 1, 2015.

Citation

When using ICD-10-CM data, cite: Centers for Disease Control and Prevention, National Center for Health Statistics. ICD-10-CM Official Guidelines and code sets.

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Created: October 30, 2025 | Last modified: September 23, 2026