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R99 — ICD-10-CM Diagnosis Codes

R99 Ill-defined and unknown cause of mortality billable

ICD-10-CM and ICD-10-PCS are maintained by CMS/CDC-NCHS; HCPCS Level II by CMS — all public-domain US code sets. Data shown from release FY2026. This site is a reference tool, not medical or billing advice, and is not affiliated with or endorsed by CMS or any government agency.

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