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C96.Z vs Z85.79

C96.Z (Other specified malignant neoplasms of lymphoid, hematopoietic and related tissue) compared with Z85.79 (Personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1. MedCoder-derived

Relationship

Conflict

Excludes1 conflict

C96.Z
Other specified malignant neoplasms of lymphoid, hematopoietic and related tissue
↔
Z85.79
Personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues

Not coded here — these two are mutually exclusive.

“personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues (Z85.79)”

An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.

Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a

Can these codes be reported together?

No — do not report together. C96.Z carries an Excludes1 note covering Z85.79: “personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues (Z85.79)”

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

C96.ZOther specified malignant neoplasms of lymphoid, hematopoietic and related tissueZ85.79Personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues
Billing statusBillableBillable
ClassificationC00-D49 — NeoplasmsZ00-Z99 — Factors influencing health status and contact with health services
DefinitionOther specified malignant neoplasms of lymphoid, hematopoietic and related tissue is a billable ICD-10-CM diagnosis code (C96.Z).Personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues is a billable ICD-10-CM diagnosis code (Z85.79).
Includes—
Conditions classifiable to C88-C90, C96
Use additional code—
code to identify:
alcohol use and dependence (F10.-)
exposure to environmental tobacco smoke (Z77.22)
Code first—
any follow-up examination after treatment of malignant neoplasm (Z08)
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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