All ICD10 Codes

F99

Billable
ChapterF01–F99
Rankcategory
Official Description

Mental disorder, not otherwise specified

Metadata & Insights
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 5: Mental, Behavioral and Neurodevelopmental Disorders (F01-F99).

CH5 Parent Instructions

Includes
  • disorders of psychological development
Excludes2(Not included here. Code separately if applicable.)
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Instructional Notes

Includes
  • Mental illness NOS
Excludes1(Not coded here. Use a different code.)
  • unspecified mental disorder due to known physiological condition (F09)

Clinical Hierarchy

BillableHas subcodes
CH5Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
F99Mental disorder, not otherwise specifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to F99:

chapterCH5
Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
View context instructions

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 880
Acute Adjustment Reaction and Psychosocial Dysfunction

Cross Reference

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