ICD-10 Code Database & Resources
Comprehensive ICD-10 code reference for medical coders and providers. Find diagnosis codes, coding guidelines, and clinical documentation requirements.
Browse by Specialty
Explore high-volume diagnosis codes organized by medical specialty
Cardiovascular
Heart disease, hypertension, stroke
- I10 Essential (primary) hypertension
- I50.9 Heart failure, unspecified
- I11.0 Hypertensive heart disease with heart failure
- I63.9 Cerebral infarction, unspecified
- I48.91 Unspecified atrial fibrillation
Diabetes & Endocrine
Diabetes complications, thyroid, metabolism
- E11.9 Type 2 diabetes mellitus without complications
- E11.22 Type 2 diabetes mellitus with diabetic chronic kidney disease
- E11.40 Type 2 diabetes mellitus with diabetic neuropathy, unspecified
- E66.01 Morbid (severe) obesity due to excess calories
- E05.90 Thyrotoxicosis, unspecified without thyrotoxic crisis
Mental Health
Depression, anxiety, ADHD, behavioral
- F41.9 Anxiety disorder, unspecified
- F32.9 Major depressive disorder, single episode, unspecified
- F33.1 Major depressive disorder, recurrent, moderate
- F40.10 Social anxiety disorder, unspecified
- F90.0 Attention-deficit hyperactivity disorder, predominantly inattentive type
Musculoskeletal
Back pain, arthritis, orthopedic conditions
- M54.5 Low back pain
- M25.511 Pain in right shoulder
- M16.9 Osteoarthritis of hip, unspecified
- M75.100 Unspecified rotator cuff tear or rupture of unspecified shoulder, not specified as traumatic
- M81.0 Age-related osteoporosis without current pathological fracture
Respiratory
Asthma, COPD, pneumonia, allergies
- J44.9 Chronic obstructive pulmonary disease, unspecified
- J45.909 Unspecified asthma, uncomplicated
- J30.9 Allergic rhinitis, unspecified
- J45.40 Moderate persistent asthma, uncomplicated
- J18.9 Pneumonia, unspecified organism
Gastrointestinal
GERD, IBS, liver disease, GI conditions
- K21.9 Gastro-esophageal reflux disease without esophagitis
- K76.0 Fatty (change of) liver, not elsewhere classified
- K59.00 Constipation, unspecified
- K29.70 Gastritis, unspecified, without bleeding
- K64.9 Unspecified hemorrhoids
Genitourinary
Kidney disease, UTI, reproductive health
- N39.0 Urinary tract infection, site not specified
- N18.3 Chronic kidney disease, stage 3 (moderate)
- N18.4 Chronic kidney disease, stage 4 (severe)
- N20.0 Calculus of kidney
- N95.1 Menopausal and female climacteric states
Dermatology
Skin conditions, rashes, dermatitis
- L30.9 Dermatitis, unspecified
- L70.0 Acne vulgaris
- L50.9 Urticaria, unspecified
- L71.9 Rosacea, unspecified
- L60.0 Ingrowing nail
Neurology
Headaches, neuropathy, neurological
- G43.909 Migraine, unspecified, not intractable, without status migrainosus
- G89.29 Other chronic pain
- G62.9 Polyneuropathy, unspecified
- G47.33 Obstructive sleep apnea (adult) (pediatric)
- G20 Parkinson's disease
Eye & ENT
Vision, hearing, ear conditions
- H52.13 Myopia, bilateral
- H40.9 Unspecified glaucoma
- H61.23 Impacted cerumen, bilateral
- H66.90 Otitis media, unspecified, unspecified ear
Preventive Care
Screenings, vaccines, wellness visits
- Z00.00 Encounter for general adult medical examination without abnormal findings
- Z23 Encounter for immunization
- Z79.4 Long term (current) use of insulin
- Z79.891 Long term (current) use of opiate analgesic
- Z87.891 Personal history of nicotine dependence
Most Common ICD-10 Codes
Top 20 frequently used diagnosis codes across all specialties
Essential (primary) hypertension
Diseases of the circulatory system
Type 2 diabetes mellitus without complications
Endocrine, nutritional and metabolic diseases
Type 2 diabetes mellitus with hyperglycemia
Endocrine, nutritional and metabolic diseases
Acute upper respiratory infection, unspecified
Diseases of the respiratory system
Low back pain
Diseases of the musculoskeletal system and connective tissue
Encounter for general adult medical examination without abnormal findings
Factors influencing health status and contact with health services
Hyperlipidemia, unspecified
Endocrine, nutritional and metabolic diseases
Obesity, unspecified
Endocrine, nutritional and metabolic diseases
Anxiety disorder, unspecified
Mental, behavioral and neurodevelopmental disorders
Chronic obstructive pulmonary disease, unspecified
Diseases of the respiratory system
Unspecified atrial fibrillation
Diseases of the circulatory system
Urinary tract infection, site not specified
Diseases of the genitourinary system
Major depressive disorder, single episode, unspecified
Mental, behavioral and neurodevelopmental disorders
Gastro-esophageal reflux disease without esophagitis
Diseases of the digestive system
Migraine, unspecified, not intractable, without status migrainosus
Diseases of the nervous system
Encounter for immunization
Factors influencing health status and contact with health services
Unspecified asthma, uncomplicated
Diseases of the respiratory system
Pain in right shoulder
Diseases of the musculoskeletal system and connective tissue
Nicotine dependence, cigarettes, uncomplicated
Mental, behavioral and neurodevelopmental disorders
Pneumonia, unspecified organism
Diseases of the respiratory system
Explore 99 total codes organized by specialty and clinical category
What are ICD-10 Codes?
ICD-10 (International Classification of Diseases, 10th Revision) codes are alphanumeric codes used by healthcare providers, insurers, and public health agencies to classify and code diagnoses, symptoms, and procedures. These codes are essential for:
- Medical Billing: Submitting claims to insurance companies
- Clinical Documentation: Recording patient diagnoses accurately
- Health Statistics: Tracking disease prevalence and outcomes
- Quality Measurement: Monitoring healthcare quality metrics
- Research: Conducting epidemiological studies
How to Use This Resource
Our ICD-10 code database provides comprehensive information for each diagnosis code:
- Code Structure: Understanding the code format and hierarchy
- Clinical Information: When to use each code with real-world scenarios
- Documentation Requirements: What to document for compliant coding
- Coding Guidelines: Inclusion/exclusion terms and coding notes
- Related Codes: Similar or related diagnosis codes to consider
Finding Codes
Browse our database by:
- Specialty: Choose from 12 medical specialty categories
- Common Codes: View the top 20 most frequently used diagnosis codes
- Individual Pages: Each code has detailed clinical information, documentation requirements, and coding guidelines
- Related Codes: Find similar or related diagnosis codes for comprehensive coding
ICD-10 Coding Guidelines
Accurate ICD-10 coding requires following official coding guidelines:
- Code to the highest level of specificity: Use the most detailed code available
- Document clinical significance: Only code conditions that affect patient care
- Use combination codes when available: Single code for multiple conditions
- Sequence codes appropriately: Primary diagnosis first, then secondary
- Verify billable status: Ensure the code can be used for reimbursement
Code Structure
ICD-10-CM codes follow a specific structure:
- 1st character: Letter indicating the chapter (e.g., I = Circulatory)
- 2nd & 3rd characters: Numbers indicating the category
- 4th-7th characters: Additional specificity (etiology, severity, laterality)
Example: E11.65 = Type 2 diabetes (E11) with hyperglycemia (.65)
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