2026 ICD-10-CM Diagnosis Code J33.9Nasal polyp, unspecified

ICD-10-CM Codes›J00–J99›J30-J39›J33

ICD-10-CM J33.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J33.9 is a billable ICD-10-CM diagnosis code for nasal polyp, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 154 through 156. Coders also document this condition as chronic rhinosinusitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified upper respiratory disease.

Code Identity

ICD-10-CM Code
J33.9
Billable Status
Yes — Valid for Submission
Code Describes
Nasal polyp, unspecified
Short Description
Nasal polyp, unspecified
Same as the full description in the CMS dataset.
Parent Code
J33
Nasal polyp

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ30-J39Other diseases of upper respiratory tract
CategoryJ33Nasal polyp
This CodeJ33.9Nasal polyp, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic rhinosinusitis
  • Chronic rhinosinusitis with multiple nasal polyps
  • Nasal polyposis
  • Rhinosinusitis
  • Sinusitis co-occurrent with nasal polyps

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Hyperplasia, hyperplastic
      • nose
        • polypoid
    • Polyp, polypus
      • nares
        • anterior
    • Polyp, polypus
      • nasal (mucous)
    • Polyp, polypus
      • nose (mucous)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR RSP007
Other specified and unspecified upper respiratory disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Allergic Fungal Sinusitis

    fungal infection in the paranasal sinuses characterized by common allergy respiratory symptoms, recurrent nasal polyps and/or asthma with buildup of allergic mucin.

  • Rhinosinusitis

    obstruction of sinus drainage into the nasal cavity and inflammation of the nasal mucosa in the paranasal sinuses.

  • Rhinosinusitis

    inflammation of the mucous membranes lining the nose and paranasal sinuses.

Patient EducationClinical

Nose Injuries and Disorders

Your nose is important to your health. It filters the air you breathe, removing dust, germs, and irritants. It warms and moistens the air to keep your lungs and tubes that lead to them from drying out. Your nose also contains the nerve cells that help your sense of smell.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert J33.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
471.9 Nasal polyp NOS
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About J33.9Overview

Is J33.9 (Nasal polyp) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report nasal polyp, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does J33.9 group to?

When nasal polyp, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 154, 155, 156, with relative weights from 0.6911 to 1.5635 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of J33.9?

Under the General Equivalence Mappings, nasal polyp, unspecified converts to ICD-9-CM 471.9 (nasal polyp NOS). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.