F48.9Nonpsychotic mental disorder, unspecified

F48.9 is the ICD-10-CM diagnosis code for nonpsychotic mental disorder, unspecified. It belongs to category F48 (other nonpsychotic mental disorders), block F40-F48 (anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 300.9 (unspecified nonpsychotic mental disorder), V40.2 (other mental problems) and V40.9 (unspecified mental or behavioral problem).