U.S. ICD-10-CM · FY 2027

C80.1 ICD-10-CM Code: Malignant (primary) neoplasm, unspecified

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

C80.1

Malignant (primary) neoplasm, unspecified

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where C80.1 sits

  1. 1

    Chapter 2

    Neoplasms (C00-D49)

  2. 2

    Section

    Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80)

  3. 3

    Category C80

    Malignant neoplasm without specification of site

  4. 4

    Code C80.1

    Malignant (primary) neoplasm, unspecified

Documentation details

Notes for this code

Inclusion terms

  • Cancer NOS
  • Cancer unspecified site (primary)
  • Carcinoma unspecified site (primary)
  • Malignancy unspecified site (primary)

Code first

No “code first” instruction is listed for C80.1.

Use additional code

No “use additional code” instruction is listed for C80.1.

Excludes1

Conditions that should not be reported together with this code.

  • secondary malignant neoplasm of unspecified site (C79.9)

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for C80.1.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code C80.1 mean?

C80.1 is the FY 2027 U.S. ICD-10-CM code for “Malignant (primary) neoplasm, unspecified.”

Is C80.1 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, C80.1 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.

Where is C80.1 located in ICD-10-CM?

C80.1 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80) (C76–C80), under category C80, Malignant neoplasm without specification of site.

What coding notes are listed for C80.1?

Its listed inclusion terms are Cancer NOS; Cancer unspecified site (primary); Carcinoma unspecified site (primary); Malignancy unspecified site (primary). No code-first instruction is listed. Excludes1 notes: secondary malignant neoplasm of unspecified site (C79.9). No Excludes2 note is listed.

Keep exploring

Related C80 codes

C80.0

Disseminated malignant neoplasm, unspecified

C80.2

Malignant neoplasm associated with transplanted organ

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