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C11.1 vs Z85.819

C11.1 (Malignant neoplasm of posterior wall of nasopharynx) compared with Z85.819 (Personal history of malignant neoplasm of unspecified site of lip, oral cavity, and pharynx), from the official CMS tabular data. Z85.819 is the personal-history/screening code for the active disease C11.1 names.

Relationship

Review

Condition lifecycle relationship

Z85.819
Personal history of malignant neoplasm of unspecified site of lip, oral cavity, and pharynx
↔
C11.1
Malignant neoplasm of posterior wall of nasopharynx

Personal-history or screening code versus the active disease.

Active disease for this site (pharynx)

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. Z85.819 is the personal-history or screening code for the active disease C11.1 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

C11.1Malignant neoplasm of posterior wall of nasopharynxZ85.819Personal history of malignant neoplasm of unspecified site of lip, oral cavity, and pharynx
Billing statusBillableBillable
ClassificationC00-D49 — NeoplasmsZ00-Z99 — Factors influencing health status and contact with health services
DefinitionMalignant neoplasm of posterior wall of nasopharynx is a billable ICD-10-CM diagnosis code (C11.1).Personal history of malignant neoplasm of unspecified site of lip, oral cavity, and pharynx is a billable ICD-10-CM diagnosis code (Z85.819).
Includes
Malignant neoplasm of adenoid
Malignant neoplasm of pharyngeal tonsil
—
Use additional code
code to identify:
exposure to environmental tobacco smoke (Z77.22)
exposure to tobacco smoke in the perinatal period (P96.81)
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