2026 ICD-10-CM Diagnosis Code J33.8Other polyp of sinus

ICD-10-CM Codes›J00–J99›J30-J39›J33

ICD-10-CM J33.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J33.8 is a billable ICD-10-CM diagnosis code for other polyp of sinus. 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 frontal sinus polyp. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified upper respiratory disease.

Code Identity

ICD-10-CM Code
J33.8
Billable Status
Yes — Valid for Submission
Code Describes
Other polyp of sinus
Short Description
Other polyp of sinus
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 CodeJ33.8Other polyp of sinus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Frontal sinus polyp
  • Herniated polyp of maxillary sinus
  • Polyp of ethmoidal sinus
  • Polyp of maxillary sinus
  • Polyp of nasal sinus
  • Polyp of sphenoidal sinus

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Accessory polyp of sinus
  • Ethmoidal polyp of sinus
  • Maxillary polyp of sinus
  • Sphenoidal polyp of sinus

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.

    • Polyp, polypus
      • accessory sinus
    • Polyp, polypus
      • antrum
    • Polyp, polypus
      • ethmoidal (sinus)
    • Polyp, polypus
      • frontal (sinus)
    • Polyp, polypus
      • maxillary (sinus)
    • Polyp, polypus
      • sinus (accessory) (ethmoidal) (frontal) (maxillary) (sphenoidal)
    • Polyp, polypus
      • sphenoidal (sinus)
    • Polyp, polypus
      • turbinate, mucous membrane

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

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 J33.8 to ICD-9-CMHistory

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

ICD-9-CM
471.8 Nasal sinus polyp NEC
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 J33.8Overview

Is J33.8 (Nasal polyp) a billable code?

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

What MS-DRG does J33.8 group to?

When other polyp of sinus 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 J33.8?

Under the General Equivalence Mappings, other polyp of sinus converts to ICD-9-CM 471.8 (nasal sinus polyp NEC). 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.