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C00.1 vs Z85.818

C00.1 (Malignant neoplasm of external lower lip) compared with Z85.818 (Personal history of malignant neoplasm of other sites of lip, oral cavity, and pharynx), from the official CMS tabular data. Z85.818 is the personal-history/screening code for the active disease C00.1 names. MedCoder-derived

Relationship

Review

Condition lifecycle relationship

Z85.818
Personal history of malignant neoplasm of other sites of lip, oral cavity, and pharynx
↔
C00.1
Malignant neoplasm of external lower lip

Personal-history or screening code versus the active disease.

Active disease for this site (lip)

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. Z85.818 is the personal-history or screening code for the active disease C00.1 names.

Site match derived from the code’s own title against the CMS/CDC 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

C00.1Malignant neoplasm of external lower lipZ85.818Personal history of malignant neoplasm of other sites of lip, oral cavity, and pharynx
Billing statusBillableBillable
ClassificationC00-D49 — NeoplasmsZ00-Z99 — Factors influencing health status and contact with health services
DefinitionMalignant neoplasm of external lower lip is a billable ICD-10-CM diagnosis code (C00.1).Personal history of malignant neoplasm of other sites of lip, oral cavity, and pharynx is a billable ICD-10-CM diagnosis code (Z85.818).
Includes
Malignant neoplasm of lower lip NOS
Malignant neoplasm of lipstick area of lower lip
Malignant neoplasm of vermilion border of lower lip
—
Use additional code
code to identify:
alcohol abuse and dependence (F10.-)
history of tobacco dependence (Z87.891)
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