ICD-10-CM Alphabetic Index · FY 2026 8 Entries
Pyrexia in the ICD-10-CM Index ICD-10-CM
The main term Pyrexia (of unknown origin) carries 8 index entries pointing to 6 ICD-10-CM codes. The default entry is R50.9, 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
8
Index Entries
6
Codes Referenced
R50.9
Default Code
P
Letter
8 of 8 shown
ICD-10-CM
Index Entries Under Pyrexia 8 entries · 6 codes
Pyrexia (of unknown origin) R50.9
atmospheric T67.01 Non-billable
during labor NEC O75.2
heat T67.01 Non-billable
newborn P81.9
environmentally-induced P81.0
persistent R50.9
puerperal O86.4
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Related Index Terms
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.
