ICD-10-CM condition code guides

335 guides to the most searched diagnoses. Each one lists every related FY2027 code with its billable status, and how to pick and sequence the right one.

Condition Guides

Diagnosis codes grouped by clinical condition, with the default code and sequencing rules.

Symptom and Finding Guides

Chapter R codes for signs, symptoms and abnormal findings when no definitive diagnosis is documented.

Encounter and Z-Code Guides

Codes for visits that are not for a disease: physicals, screenings, follow-ups, refills and supervision.

Codes by Specialty

The most frequently reported diagnosis codes for each outpatient specialty.

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 FY2027 codes?

Yes. Every guide reflects the official FY2027 ICD-10-CM tabular list published by CMS, effective October 1, 2026.

Prefer browsing by chapter? See the full ICD-10-CM chapter index.