ICD-10-CM 2027
ICD-10 code for mental upset
From the official ICD-10-CM alphabetic index entry “Upset › mental”. Page updated September 29, 2026.
About coding mental upset
The ICD-10-CM code for mental upset is F48.9 (Nonpsychotic mental disorder, unspecified).
Within F48, choose F48.9 (Nonpsychotic mental disorder, unspecified) only when documentation doesn't support a more specific option: Depersonalization-derealization syndrome (F48.1), Pseudobulbar affect (F48.2) and other specified nonpsychotic mental disorders (F48.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 880 (Acute Adjustment Reaction and Psychosocial Dysfunction, relative weight 0.9306), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about mental upset ICD-10 codes
What is the ICD-10 code for mental upset?
- F48.9 — Nonpsychotic mental disorder, unspecified.
Is F48.9 billable?
- Yes. F48.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F48.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F48.9 as a principal diagnosis.
Is F48.9 a CC or MCC?
- No. F48.9 is neither a CC nor an MCC under MS-DRG v44.0.