ICD-10-CM Code Lookup
Free reference for all 46,881 ICD-10-CM diagnosis codes, plus ICD-10-PCS, HCPCS, legacy ICD-9-CM, DRGs, and coding guidelines — sourced directly from official CMS/NCHS data, with plain-language clinical notes and cross-linked related codes.
Explore all reference data
ICD-10-PCS Procedure Codes
79,193 codes
CodesHCPCS Level II Codes
8,850 codes
ReferenceDiagnosis Index
diagnostic terms
ReferenceExternal Causes Index
external-cause terms
ReferenceTable of Drugs
substances
ReferenceTable of Neoplasms
anatomical sites
CodesICD-9-CM Diagnosis Codes
14,567 codes
CodesICD-9-CM Procedure Codes
3,882 codes
ToolMS-DRG Lookup
765 DRGs
ToolICD-9 ↔ ICD-10 Crosswalk
official CMS GEM
GuideCoding Guidelines
22 chapters
ReferenceAnnual Code Changes
FY2026 addenda
Browse ICD-10-CM by chapter
Chapter 1
Certain infectious and parasitic diseases
Chapter 2
Neoplasms
Chapter 3
Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
Chapter 4
Endocrine, nutritional and metabolic diseases
Chapter 5
Mental, Behavioral and Neurodevelopmental disorders
Chapter 6
Diseases of the nervous system
Chapter 7
Diseases of the eye and adnexa
Chapter 8
Diseases of the ear and mastoid process
Chapter 9
Diseases of the circulatory system
Chapter 10
Diseases of the respiratory system
Chapter 11
Diseases of the digestive system
Chapter 12
Diseases of the skin and subcutaneous tissue
Chapter 13
Diseases of the musculoskeletal system and connective tissue
Chapter 14
Diseases of the genitourinary system
Chapter 15
Pregnancy, childbirth and the puerperium
Chapter 16
Certain conditions originating in the perinatal period
Chapter 17
Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
Chapter 18
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Chapter 19
Injury, poisoning and certain other consequences of external causes
Chapter 20
External causes of morbidity
Chapter 21
Factors influencing health status and contact with health services
Chapter 22
Codes for special purposes