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F99

Billable

Mental disorder, not otherwise specified

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

A mental health disorder that cannot be classified into any other specific mental disorder category.

Coding Tips

  • •This is a last-resort code; ensure all documentation has been reviewed for a more specific mental health diagnosis
  • •Consider querying the provider if symptoms are documented but a specific diagnosis is not assigned

Excludes 1 — Do NOT code together

  • unspecified mental disorder due to known physiological condition (F09)

Code Hierarchy

└F99Mental disorder, not otherwise specified
└F99Mental disorder, not otherwise specified

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