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ICD-10 Code C78.3: Secondary malignant neoplasm of other and unspecified respiratory organs

C78.3 is an ICD-10 diagnosis entry used to group records related to Secondary malignant neoplasm of other and unspecified respiratory organs. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Neoplasms (C00-D49).

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Neoplasms (C00-D49).

When is it used?

  • May be used when a clinician documents secondary malignant neoplasm of other and unspecified respiratory organs in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
  • This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter
2Neoplasms (C00-D49)
block
C00-C96Malignant neoplasms
block
C76-C80Malignant neoplasms of ill-defined, other secondary and unspecified sites
category
C78Secondary malignant neoplasm of respiratory and digestive organs
currentC78

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

OncologistGeneral PhysicianPulmonologist

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
C78.3
Replacement codes
C78.30 — Secondary malignant neoplasm of unspecified respiratory organC78.39 — Secondary malignant neoplasm of other respiratory organs

Common synonyms

Secondary malignant neoplasm of other and unspecified respiratory organsSecondary malignant neoplasm of other and respiratory organs

Frequently asked questions

Code details

CodeC78.3
SystemICD10
Display nameSecondary malignant neoplasm of other and unspecified respiratory organs
ChapterNeoplasms (C00-D49)
BlockMalignant neoplasms of ill-defined, other secondary and unspecified sites

Flags

BillableNo
Valid clinical useNo

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.