ICD-10-CM Condition Code Guides
Practical, condition-by-condition references to the most searched diagnoses in ICD-10-CM. Each guide lists every related FY2026 code with its billable status, plus guidance on sequencing, combination codes, and default unspecified usage.
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ICD-10-CM codes for all forms of diabetes mellitus, including Type 1, Type 2, drug-induced, and diabetes due to underlying conditions.
ICD-10-CM codes for hypertension, including essential hypertension, hypertensive heart disease, and hypertensive kidney disease.
ICD-10-CM codes for pneumonia, including bacterial, viral, and unspecified pneumonia types.
ICD-10-CM codes for chronic obstructive pulmonary disease (COPD), including COPD with acute exacerbation and COPD with acute lower respiratory infection.
ICD-10-CM codes for asthma classified by severity, including mild intermittent, mild persistent, moderate persistent, and severe persistent asthma.
ICD-10-CM codes for chronic kidney disease (CKD) stages 1 through 5 and end stage renal disease (ESRD).
ICD-10-CM codes for heart failure, including systolic (HFrEF), diastolic (HFpEF), combined, acute, chronic, and hypertensive heart failure.
ICD-10-CM codes for atrial fibrillation, including paroxysmal, persistent, longstanding persistent, chronic, and permanent AFib.
ICD-10-CM codes for sepsis, including sepsis by causative organism, severe sepsis, and septic shock.
ICD-10-CM codes for gastro-esophageal reflux disease (GERD), with and without esophagitis.
ICD-10-CM codes for urinary tract infection (UTI), including cystitis and UTI of unspecified site.
ICD-10-CM codes for stroke and cerebral infarction, including occlusion-related codes and late effects of stroke.
ICD-10-CM codes for anemia, including iron deficiency anemia, hemolytic anemia, aplastic anemia, and anemia in chronic disease.
ICD-10-CM codes for hypothyroidism, including congenital hypothyroidism, postprocedural hypothyroidism, and myxedema coma.
ICD-10-CM codes for osteoarthritis across categories M15-M19, including hip, knee, hand, and polyosteoarthritis.
ICD-10-CM codes for depression, including single depressive episodes (F32), recurrent major depressive disorder (F33), and remission status.
ICD-10-CM codes for migraine, including migraine with aura, without aura, chronic migraine, intractable migraine, and status migrainosus.
ICD-10-CM codes for coronary artery disease (atherosclerotic heart disease of native coronary artery), with and without angina.
ICD-10-CM codes for overweight and obesity, including morbid (severe) obesity and obesity with alveolar hypoventilation.
Frequently Asked Questions
What are ICD-10-CM condition code guides?
Condition code guides organize ICD-10-CM codes by diagnosis rather than by chapter, showing all related billable codes plus coding guidance such as sequencing rules, combination codes, and default unspecified code usage.
Which ICD-10-CM code should I use when documentation is unclear?
When specificity is not documented, use the default or unspecified code listed in each guide, such as E11.9 for Type 2 diabetes or N39.0 for urinary tract infection. Always query the provider first if more specific information can be obtained.
Are these guides based on FY2026 codes?
Yes. Every guide reflects the official FY2026 ICD-10-CM tabular list published by CMS, effective April 1, 2026.
About this hub
These guides complement the full ICD-10-CM chapter index. All codes are sourced from the official FY2026 tabular list published by CMS, effective April 1, 2026. Guidance reflects standard ICD-10-CM Official Guidelines for Coding and Reporting conventions.