F44.9
Dissociative and conversion disorder, unspecified
F44.9 (also written F449) is a billable ICD-10-CM diagnosis code for dissociative and conversion disorder, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 10 codes in category F44 (Dissociative and conversion disorders). The Alphabetic Index lists it under 16 entries. Its coding notes include 2 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Behavioral Health clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026IPF Primary
IPF MS-DRG adjustment. A principal diagnosis of this code groups to this MS-DRG:
| MS-DRG | Description | Factor |
|---|---|---|
| 880 | Acute adjustment reaction & psychosocial dysfunction | 1.08 |
Includes
Further defines or gives examples of the content of the category.
- conversion hysteria
- conversion reaction
- hysteria
- hysterical psychosis
Also from chapter/block level (1 note)
- disorders of psychological development
Inclusion terms
Conditions classified to this code.
- Dissociative disorder NOS
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 16 entries
- Attack, attacks, hysterical
- Conversion hysteria, neurosis or reaction
- Disorder (of), dissociative
- Dissociative reaction, state
- Hysteria, hysterical (conversion) (dissociative state)
- Hysteria, hysterical (conversion) (dissociative state), psychosis, acute
- Neurosis, neurotic, conversion
- Neurosis, neurotic, hysterical
- Psychoneurosis, psychoneurotic, hysteria
- Psychosis, psychotic, acute (transient), hysterical
- Psychosis, psychotic, hysterical (acute)
- Reaction, conversion