Convert ICD-10 F99 to ICD-9

ICD-10 code F99, Mental disorder, not otherwise specified, crosswalked to ICD-9 with the official CMS General Equivalence Mappings. Convert another code below.

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Official CMS General Equivalence Mappings Final GEMs release (FY 2018) Maps in both directions

1 ICD-9 mapping for ICD-10 F99

From the official CMS General Equivalence Mappings. Review each mapping's flags before selecting the final code. Convert another code

ICD-10 code F99, "Mental disorder, not otherwise specified", maps to ICD-9 code 300.9, "Nonpsychotic disord NOS". The mapping is flagged approximate: it is the closest available equivalent, not an exact match, so review the clinical documentation when selecting the final code. The crosswalk comes from the official CMS General Equivalence Mappings.

ICD‑10 Code

F99

Mental disorder, not otherwise specified

ICD‑9 Code

300.9

Nonpsychotic disord NOS

Approximate Flag – This ICD-10 code does not have an exact ICD-9 equivalent. The matched code is the closest available option and may not fully capture the original diagnosis.

See everything about the source code, including its category, synonyms, and history: open the F99 code page → Or run the reverse crosswalk: convert 300.9 back to ICD-10 →