ICD-10-CM Codes Lookup & Directory
Explore the complete, authoritative ICD-10-CM codes list. Browse all 22 official CDC chapters, inspect diagnosis code hierarchies, verify billable code status, and access essential coding guidelines.
Browse by Chapter (22 Official Chapters)
Select any chapter below to view code ranges, category lists, and clinical guidance.
Certain infectious and parasitic diseases
Infections caused by bacteria, viruses, parasites, fungi, and other communicable agents.
Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
Anemias, coagulation defects, purpura, and immune disorders.
Endocrine, nutritional and metabolic diseases
Diabetes mellitus, thyroid disorders, nutritional deficiencies, and metabolic syndromes.
Mental, Behavioral and Neurodevelopmental disorders
Mood disorders, anxiety, substance use disorders, and developmental conditions.
Diseases of the nervous system
Central and peripheral nervous system conditions, headaches, and neuropathies.
Diseases of the eye and adnexa
Disorders of vision, glaucoma, cataracts, and ocular conditions.
Diseases of the ear and mastoid process
Hearing disorders, otitis media, and vestibular dysfunctions.
Diseases of the circulatory system
Essential hypertension, coronary artery disease, heart failure, and stroke.
Diseases of the respiratory system
Acute respiratory infections, asthma, COPD, pneumonia, and influenza.
Diseases of the digestive system
Gastrointestinal disorders, GERD, ulcers, hernias, and liver diseases.
Diseases of the skin and subcutaneous tissue
Dermatological conditions, cellulitis, dermatitis, and ulcers.
Diseases of the musculoskeletal system and connective tissue
Arthritis, back pain, joint derangements, and soft tissue disorders.
Diseases of the genitourinary system
Kidney disorders, urinary tract infections, and male/female genital diseases.
Pregnancy, childbirth and the puerperium
Obstetric care, maternal conditions, labor, and delivery.
Certain conditions originating in the perinatal period
Newborn conditions, neonatal respiratory distress, and birth trauma.
Congenital malformations, deformations and chromosomal abnormalities
Structural congenital anomalies and chromosomal syndromes.
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Symptoms such as cough, fever, pain, dizziness, and unconfirmed diagnostic findings.
Injury, poisoning and certain other consequences of external causes
Traumatic injuries, fractures, wounds, burns, and adverse drug reactions requiring 7th character coding.
External causes of morbidity
Environmental events, accidents, and mechanisms of injury.
Factors influencing health status and contact with health services
Encounter codes for immunizations, routine checkups, screenings, and personal history.
Codes for special purposes
Provisional assignment of new diseases, COVID-19, and vaping-related disorders.
Understanding ICD-10-CM Billable Codes & Clinical Specificity
In the ICD-10-CM classification system, not all codes are billable on health insurance claims. Three-character codes such as E11 (Type 2 diabetes) or M54 (Dorsalgia) represent categories and are non-billable. To satisfy HIPAA transaction requirements, providers must report codes to the highest level of clinical specificity, using 4, 5, 6, or 7 characters (such as E11.9 or M54.50).