2026 ICD-10-CM Diagnosis Code C13.9Malignant neoplasm of hypopharynx, unspecified
ICD-10-CM Codes›C00–D49›C00-C14›C13
- Billable — Valid for Submission
- Chronic Condition
C13.9 is a billable ICD-10-CM diagnosis code for malignant neoplasm of hypopharynx, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 146 through 148. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Head and neck cancers - hypopharyngeal.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Adenoid cystic carcinoma of hypopharynx
- Adenoid squamous cell carcinoma of hypopharynx
- Adenosquamous carcinoma of hypopharynx
- Basaloid carcinoma of hypopharynx
- Basaloid squamous cell carcinoma of hypopharynx
- Giant cell carcinoma of hypopharynx
- Lymphoepithelial carcinoma of hypopharynx
- Malignant epithelial neoplasm of hypopharynx
- Malignant neoplasm of cervical esophagus
- Malignant neoplasm of hypopharynx
- Malignant neoplasm of pharyngo-esophageal junction
- Mucoepidermoid carcinoma of hypopharynx
- Papillary squamous cell carcinoma of hypopharynx
- Primary acantholytic squamous cell carcinoma
- Primary adenocarcinoma of hypopharynx
- Primary adenoid cystic carcinoma of hypopharynx
- Primary adenoid squamous cell carcinoma of hypopharynx
- Primary adenosquamous carcinoma of hypopharynx
- Primary adenosquamous cell carcinoma
- Primary basaloid carcinoma of hypopharynx
- Primary basaloid squamous cell carcinoma of hypopharynx
- Primary giant cell carcinoma of hypopharynx
- Primary lymphoepithelial carcinoma
- Primary lymphoepithelial carcinoma of hypopharynx
- Primary malignant neoplasm of hypopharynx
- Primary mucoepidermoid carcinoma of hypopharynx
- Primary papillary squamous cell carcinoma of hypopharynx
- Primary salivary gland type carcinoma of hypopharynx
- Primary spindle cell squamous cell carcinoma
- Primary spindle cell squamous cell carcinoma of hypopharynx
- Primary squamous cell carcinoma of hypopharynx
- Primary undifferentiated carcinoma of hypopharynx
- Primary verrucous carcinoma of hypopharynx
- Primary verrucous squamous cell carcinoma
- Salivary gland type carcinoma of hypopharynx
- Spindle cell squamous cell carcinoma of hypopharynx
- Undifferentiated carcinoma of hypopharynx
- Verrucous carcinoma of hypopharynx
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Malignant neoplasm of hypopharyngeal wall NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
Patient EducationClinical
Throat Cancer
Throat cancer is a type of head and neck cancer. Throat cancer has different names, depending on which part of the throat is affected. The different parts of your throat are called the oropharynx, the hypopharynx, the nasopharynx, and the larynx, or voice box.
Read the full article at MedlinePlus
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Convert C13.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About C13.9Overview
Is C13.9 (Malignant neoplasm of hypopharynx) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of hypopharynx, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does C13.9 group to?
When malignant neoplasm of hypopharynx, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 146, 147, 148, with relative weights from 0.7971 to 2.1174 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of C13.9?
Under the General Equivalence Mappings, malignant neoplasm of hypopharynx, unspecified converts to ICD-9-CM 148.9 (mal neo hypopharynx NOS). The mapping is a direct match.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
