FY2027 ICD-10-CM reference
F21: Schizotypal disorder
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Schizotypal disorder. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Includes
disorders of psychological development
Source: F01-F99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Source: F01-F99 (chapter, inherited).
Instructional note
Borderline schizophrenia
Source: F21 (category, direct).
Instructional note
Latent schizophrenia
Source: F21 (category, direct).
Instructional note
Latent schizophrenic reaction
Source: F21 (category, direct).
Instructional note
Prepsychotic schizophrenia
Source: F21 (category, direct).
Instructional note
Prodromal schizophrenia
Source: F21 (category, direct).
Instructional note
Pseudoneurotic schizophrenia
Source: F21 (category, direct).
Instructional note
Pseudopsychopathic schizophrenia
Source: F21 (category, direct).
Instructional note
Schizotypal personality disorder
Source: F21 (category, direct).
Excludes2
Asperger's syndrome (F84.5)
Source: F21 (category, direct).
Excludes2
schizoid personality disorder (F60.1)
Source: F21 (category, direct).
Compare the FY2027 additions, removals and billable-status changes
What does F21 mean in FY2027?
The official ICD-10-CM descriptor is Schizotypal disorder. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is F21 billable in FY2027?
The FY2027 order file marks F21 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does F21 map to an HCC?
In the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service), F21 maps to CMS-HCC V28 HCC 153 (Personality Disorders; Anorexia/Bulimia Nervosa). For 2027 dates of service, CMS has not yet published the payment year 2028 mappings. ESRD, RxHCC, PACE and HHS-HCC mappings are still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition