ICD10BillableValid for clinical use
ICD-10 Code C17.8: Malignant neoplasm of overlapping sites of small intestine
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Neoplasms (C00-D49).
When is it used?
- May be used when a clinician documents malignant neoplasm of overlapping sites of small intestine in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
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.
Code hierarchy
chapter
2Neoplasms (C00-D49)
block
C00-C96Malignant neoplasms
block
C00-C75Malignant neoplasms, stated or presumed to be primary (of specified sites), and certain specified histologies, except neuroendocrine, and of lymphoid, hematopoietic and related tissue
block
C15-C26Malignant neoplasms of digestive organs
category
C17Malignant neoplasm of small intestine
currentC17
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
OncologistGeneral Physician
Related codes
Sibling codes
Coverage-related procedures and services
CPT 81479high
UNLISTED MOLECULAR PATHOLOGY PROCEDURE
Source: CMS coverage guidance
CPT 81445high
SOLID ORGAN NEOPLASM, GENOMIC SEQUENCE ANALYSIS PANEL, 5-50 GENES, INTERROGATION FOR SEQUENCE VARIANTS AND COPY NUMBER VARIANTS OR REARRANGEMENTS, IF PERFORMED; DNA ANALYSIS OR COMBINED DNA AND RNA ANALYSIS
Source: CMS coverage guidance
CPT 81293high
MLH1 (MUTL HOMOLOG 1, COLON CANCER, NONPOLYPOSIS TYPE 2) (EG, HEREDITARY NON-POLYPOSIS COLORECTAL CANCER, LYNCH SYNDROME) GENE ANALYSIS; KNOWN FAMILIAL VARIANTS
Source: CMS coverage guidance
CPT 0543Uhigh
ONCOLOGY (SOLID TUMOR), NEXT-GENERATION SEQUENCING OF DNA FROM FORMALIN-FIXED PARAFFIN-EMBEDDED (FFPE) TISSUE OF 517 GENES, INTERROGATION FOR SINGLE-NUCLEOTIDE VARIANTS, MULTI-NUCLEOTIDE VARIANTS, INSERTIONS AND DELETIONS FROM DNA, FUSIONS IN 24 GENES AND SPLICE VARIANTS IN 1 GENE FROM RNA, AND TUMOR MUTATION BURDEN
Source: CMS coverage guidance
CPT 81435high
HEREDITARY COLON CANCER-RELATED DISORDERS (EG, LYNCH SYNDROME, PTEN HAMARTOMA SYNDROME, COWDEN SYNDROME, FAMILIAL ADENOMATOSIS POLYPOSIS), GENOMIC SEQUENCE ANALYSIS PANEL, 5 OR MORE GENES, INTERROGATION FOR SEQUENCE VARIANTS AND COPY NUMBER VARIANTS
Source: CMS coverage guidance
CPT 81437high
HEREDITARY NEUROENDOCRINE TUMOR-RELATED DISORDERS (EG, MEDULLARY THYROID CARCINOMA, PARATHYROID CARCINOMA, MALIGNANT PHEOCHROMOCYTOMA OR PARAGANGLIOMA), GENOMIC SEQUENCE ANALYSIS PANEL, 5 OR MORE GENES, INTERROGATION FOR SEQUENCE VARIANTS AND COPY NUMBER VARIANTS
Source: CMS coverage guidance
Mapped diagnoses and classifications
SNOMED_CT 860828007high
Gastrointestinal stromal neoplasm of overlapping sites of small intestine
Source: SNOMED International ICD-10 map
SNOMED_CT 109837002high
Overlapping malignant neoplasm of small intestine
Source: SNOMED International ICD-10 map
SNOMED_CT 721669006high
Primary adenocarcinoma of overlapping sites of small intestine
Source: SNOMED International ICD-10 map
SNOMED_CT 1259801009high
Primary gastrointestinal stromal neoplasm of overlapping sites of small intestine
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
C17.8
Common synonyms
Malignant neoplasm of overlapping sites of small intestine
Frequently asked questions
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.