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Home/Diagnosis/ICD-10 Coding for Carcinomatosis

ICD-10 Coding for Carcinomatosis

C78.6
C80.1

Complete ICD-10-CM coding and documentation guide for icd-10 coding for carcinomatosis includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
Peritoneal Carcinomatosis
Metastatic Peritoneal Cancer
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Key Information: ICD-10 Coding for Carcinomatosis

Essential facts and insights about ICD-10 Coding for Carcinomatosis

Use ICD-10 code C78.6 for secondary malignant neoplasm of retroperitoneum and peritoneum, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Secondary malignant neoplasm of retroperitoneum and peritoneum

Billable Code
C78.6
Billable

Diagnostic Criteria

clinical:
  • • Presence of metastatic disease in the peritoneum confirmed by imaging and pathology.
coding:
  • • Primary malignancy must be coded if known.

Applicable To

  • • Peritoneal carcinomatosis

Important Notes

  • • Ensure documentation specifies the primary site if known.

Malignant (primary) neoplasm, unspecified

Billable Code
C80.1
Billable

Diagnostic Criteria

clinical:
  • • Lack of documentation specifying the primary site

Important Notes

  • • Use only when the primary site cannot be determined.
Ancillary Codes

Additional codes that may be used with this diagnosis

Z51.11

Encounter for antineoplastic chemotherapy

Use when the encounter is primarily for chemotherapy treatment.

Frequently Asked Questions

What is the ICD-10 code for peritoneal carcinomatosis?

The ICD-10 code for peritoneal carcinomatosis is C78.6, which indicates a secondary malignant neoplasm of the peritoneum.

How do you code carcinomatosis with an unknown primary site?

For carcinomatosis with an unknown primary site, use C78.6 for the secondary neoplasm and C80.1 for the unspecified primary neoplasm.

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