Z Codes for Mental Health: List and When to Use Them

Not the social determinant codes. Section I.B.14 of the FY2027 Official Guidelines says codes for social determinants of health should only be reported as secondary diagnoses. That covers categories Z55 to Z65, which includes Z63.0 and the other relationship codes. The mental health diagnosis being treated goes first.

Other Z codes follow their own rules. The guidelines list a small set of Z codes that may only be first-listed, such as Z04, Encounter for examination and observation for other reasons, and describe counseling Z codes (including Z69 and Z71) used when a client or family member receives counseling for family or social problems. Whether a payer covers a visit with one of these codes listed first is a payer decision, so check the plan.

Unlike most diagnoses, social determinant codes do not have to come from the client's provider. The FY2027 guidelines (Section I.C.21.c.17) say they may be assigned from documentation by other clinicians involved in care, such as social workers, community health workers, case managers, or nurses, because this is social information rather than a medical diagnosis. Client self-reported information may also be used if a clinician or provider signs off on it and incorporates it into the record.

Documentation still has to show the problem. The guidelines give an example: living alone supports Z60.2 only when the record shows a risk or unmet need for help at home, not merely that the client lives alone.

Section IV.J of the outpatient guidelines says history codes may be used as secondary codes when the past condition affects current care or treatment.

For FY2026 (effective October 1, 2025), Z59.86, Financial insecurity, became a heading with three billable codes: Z59.861 (difficulty paying for utilities), Z59.868 (other specified) and Z59.869 (unspecified). A claim that still reports Z59.86 is invalid. The FY2027 update (effective October 1, 2026) did not change any of the Z55 to Z65 codes listed on this page; its Z code additions were in other areas, such as exposure and gender transition history codes.

A couples session where the identified client has a documented depressive disorder might list F33.1 first and Z63.0 second, with CPT 90847 as the service. A family session addressing parent-child conflict for a child with ADHD might list F90.2 and then Z62.820, billed with 90846 or 90847 depending on whether the child attended. Coverage for relationship-focused work varies, so verify benefits.