ICD-10-CM 2027
ICD-10 code for state neurosis
From the official ICD-10-CM alphabetic index entry “Neurosis, neurotic › state”. Page updated September 29, 2026.
About coding state neurosis
The ICD-10-CM code for state neurosis is F48.9 (Nonpsychotic mental disorder, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on F48.9.
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.
More specific state neurosis codes (official index)
- with depersonalization episode F48.1 — Depersonalization-derealization syndrome
Common questions about state neurosis ICD-10 codes
What is the ICD-10 code for state neurosis?
- F48.9 — Nonpsychotic mental disorder, unspecified. More specific codes apply when the documentation supports them: F48.1.
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.