ICD-10 CM & PCS
2026 Reference
Free clinical reference for ICD-10-CM diagnosis codes, ICD-10-PCS procedure codes, and MS-DRG mappings. Browse by chapter or search across the full 2026 dataset.
Browse by coding system
Billable & non-billable diagnosis hierarchy with chapter navigation, clinical notes, and index lookup.
Table-driven 7-character procedure codes with index lookups, table links, and axis definitions.
Browse DRG groups with direct links to mapped ICD-10-CM and ICD-10-PCS codes for billing.
Convert bidirectional crosswalks between ICD-9 and ICD-10 directly using exact GEM mappings.
Quick links
Browse by condition
Coding Rules & Guidelines
Specialized code groupings and validation rules from official CMS guidelines
ICD-10-CM diagnoses designated by MCE age-conflict logic for perinatal/newborn patients (age 0 years only).
ICD-10-CM diagnoses designated by MCE age-conflict logic for pediatric patients (age 0 through 17).
ICD-10-CM diagnoses designated by MCE age-conflict logic for maternity patients (age 9 through 64).
ICD-10-CM diagnoses designated by MCE age-conflict logic for adult patients (age 15 through 124).
ICD-10-CM manifestation diagnoses not allowed as principal diagnosis per MCE edit logic.
ICD-10-CM principal diagnoses considered questionable for acute-care admission by MCE edit logic.
ICD-10-CM outcome-of-delivery diagnosis codes used in MCE questionable obstetric admission logic.
ICD-10-CM codes identified as unacceptable when used as principal diagnosis by MCE edit logic.
ICD-10-CM diagnosis codes exempt from POA reporting based on the official FY2026 CMS POA exempt list.
ICD-10-CM Chapters
22 chapters · browse by code range
About this ICD-10 Reference
allicd10codes.com is a free, comprehensive reference for the 2026 ICD-10-CM (diagnosis), ICD-10-PCS (procedure), and MS-DRG classification systems — sourced directly from the official Centers for Medicare & Medicaid Services (CMS) FY 2026 data release, effective April 1, 2026.
Use the chapter links above to navigate the full CM hierarchy, or use the search bar to look up a specific diagnosis code, keyword, or DRG. Each code page includes clinical notes, includes/excludes guidance, alphabetic index mentions, and DRG cross-references.