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C18.4 vs Z85.03

C18.4 (Malignant neoplasm of transverse colon) compared with Z85.03 (Personal history of malignant neoplasm of large intestine), from the official CMS tabular data. Z85.03 is the personal-history/screening code for the active disease C18.4 names.

Relationship

Review

Condition lifecycle relationship

Z85.03
Personal history of malignant neoplasm of large intestine
↔
C18.4
Malignant neoplasm of transverse colon

Personal-history or screening code versus the active disease.

Active disease for this site (intestine)

A personal-history code describes a condition that no longer exists and is no longer being treated, so it is not interchangeable with the active-disease code for the same site.

Source: CMS Table of Neoplasms (site match derived from the code title)

Can these codes be reported together?

History or screening versus active disease. Z85.03 is the personal-history or screening code for the active disease C18.4 names.

Site match derived from the code’s own title against the CMS Table of Neoplasms. A personal-history code describes a condition that no longer exists and is no longer being treated, so it is not interchangeable with the active-disease code.

Side by side

C18.4Malignant neoplasm of transverse colonZ85.03Personal history of malignant neoplasm of large intestine
Billing statusBillableNon-billable header

Report instead: Z85.030, Z85.038

ClassificationC00-D49 — Neoplasms (C00-D49)Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99)
DefinitionMalignant neoplasm of transverse colon is a billable ICD-10-CM diagnosis code (C18.4).Personal history of malignant neoplasm of large intestine is a non-billable ICD-10-CM category code (Z85.03).
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