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Z51 vs Z98

Z51 (Encounter for other aftercare and medical care) compared with Z98 (Other postprocedural states), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).

Can these codes be reported together?

Yes, when both are documented. Z98 carries an Excludes2 note covering Z51: “aftercare (Z43-Z49, Z51)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Side by side

Z51Encounter for other aftercare and medical careZ98Other postprocedural states
Billing statusNon-billable header

Report instead: Z51.0, Z51.11, Z51.12, Z51.5, Z51.6

Non-billable header

Report instead: Z98.0, Z98.1, Z98.2, Z98.3, Z98.41

ClassificationZ00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99)Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99)
DefinitionEncounter for other aftercare and medical care is a non-billable ICD-10-CM category code (Z51).Other postprocedural states is a non-billable ICD-10-CM category code (Z98).
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources