Billable / Specific Code
ICD-10-CM C80.1 is the diagnosis code for Malignant (primary) neoplasm, unspecified. This code falls under the section "Malignant neoplasms of ill-defined, other secondary and unspecified sites" within Chapter 2 — Neoplasms (C00-D49). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as C80.1. They are mutually exclusive:
Understanding where C80.1 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, C80.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
C80.1 is the ICD-10-CM diagnosis code for "Malignant (primary) neoplasm, unspecified". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of C80.1 is C80 ("Malignant neoplasm without specification of site"). C80.1 provides a more specific classification within this category.
C80.1 is located in Section C76-C80 — "Malignant neoplasms of ill-defined, other secondary and unspecified sites" within Chapter 2 of the ICD-10-CM Tabular List.
Use C80.1 when the patients documented diagnosis matches "Malignant (primary) neoplasm, unspecified" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Malignant (primary) neoplasm, unspecified is C80.1.
Yes, C80.1 can be used as a primary diagnosis code since it is billable and specific.
C80.1 is in Chapter 2 of the ICD-10-CM Tabular List.
Type 1 Excludes for C80.1 include: secondary malignant neoplasm of unspecified site (C79.9).
Yes, C80.1 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.