ICD-10-CM Alphabetic Index · FY 2026 6 Entries

Death in the ICD-10-CM Index ICD-10-CM

The main term Death (cause unknown) (of) (unexplained) (unspecified cause) carries 6 index entries pointing to 5 ICD-10-CM codes. The default entry is R99, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.

✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026

Index Entries

Codes Referenced

R99

Default Code

Letter

6 of 6 shown

ICD-10-CM

Index Entries Under Death 6 entries · 5 codes

Death (cause unknown) (of) (unexplained) (unspecified cause) R99

brain G93.82

cardiac (sudden) (with successful resuscitation) see Arrest, cardiac

family history of Z82.41

personal history of Z86.74

family member (assumed) Z63.4

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Related Index Terms

All index terms starting with D Index to Diseases and Injuries ICD-10-CM Code Lookup

Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.