F89 vs Z55
F89 (Unspecified disorder of psychological development) compared with Z55 (Problems related to education and literacy), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. Z55 carries an Excludes1 note covering F89: “disorders of psychological development (F80-F89)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| F89Unspecified disorder of psychological development | Z55Problems related to education and literacy | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) |
| Definition | Unspecified disorder of psychological development is a billable ICD-10-CM diagnosis code (F89). | Problems related to education and literacy is a non-billable ICD-10-CM category code (Z55). |
| Includes | Developmental disorder NOS Neurodevelopmental disorder NOS | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources