F21 — Schizotypal disorder
Is F21 billable?
Yes — F21 is billable for FY2027. F21 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. F21 may be submitted for encounters from October 1, 2026 through September 30, 2027.
F21 at a glance
| Code | F21 |
|---|---|
| Description | Schizotypal disorder |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does F21 group to?
F21 sits in MDC 19 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 883Disorders of Personality and Impulse Controlmedical
How is F21 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to F21. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Disorder › schizotypal (of)
- Schizophrenia, schizophrenic › borderline
- Schizophrenia, schizophrenic › incipient
- Schizophrenia, schizophrenic › latent
- Schizophrenia, schizophrenic › prepsychotic
- Schizophrenia, schizophrenic › prodromal
- Schizophrenia, schizophrenic › pseudoneurotic
- Schizophrenia, schizophrenic › pseudopsychopathic
- Disorder › personality › schizotypal (of)
- Reaction › schizophrenic › latent
Excludes2 — not included here
The conditions below are not part of F21, but a patient may have both at the same time. When documentation supports it, F21 and the excluded code may both be reported.
Inclusion terms
Alternative wording in documentation that is classified to F21.
- Borderline schizophrenia
- Latent schizophrenia
- Latent schizophrenic reaction
- Prepsychotic schizophrenia
- Prodromal schizophrenia
- Pseudoneurotic schizophrenia
- Pseudopsychopathic schizophrenia
- Schizotypal personality disorder
Excludes2 — not included here — inherited from Chapter 5
The conditions below are not part of F21, but a patient may have both at the same time. When documentation supports it, F21 and the excluded code may both be reported.
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
How long has F21 existed?
F21 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.