2026 ICD-10-CM Diagnosis Code J33.1Polypoid sinus degeneration

ICD-10-CM Codes›J00–J99›J30-J39›J33

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

J33.1 is a billable ICD-10-CM diagnosis code for polypoid sinus degeneration. 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 nasal polyposis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified upper respiratory disease.

Code Identity

ICD-10-CM Code
J33.1
Billable Status
Yes — Valid for Submission
Code Describes
Polypoid sinus degeneration
Short Description
Polypoid sinus degeneration
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 CodeJ33.1Polypoid sinus degeneration

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Nasal polyposis
  • Polypoid sinus degeneration
  • Sinusitis co-occurrent with nasal polyps

Tabular List NotesGuidance

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

Inclusion Terms

  • Woakes' syndrome or ethmoiditis

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.

    • Degeneration, degenerative
      • sinus (cystic)
        • polypoid
    • Ethmoiditis(chronic) (nonpurulent) (purulent)
      • Woakes'
    • Syndrome
      • Woakes' (ethmoiditis)
    • Woakes' ethmoiditis or syndrome

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

  • Polypoid Sinus Degeneration

    recurrent nasal polyps with subsequent destruction of the nasal pyramid.

  • Chronic Ethmoidal Sinusitis

    inflammation of the ethmoid sinus that typically lasts beyond eight weeks. it is caused by infections, allergies, and the presence of sinus polyps or a deviated septum. signs and symptoms include headache, nasal discharge, swelling in the face, dizziness, and breathing difficulties.

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 J33.1 to ICD-9-CMHistory

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

ICD-9-CM
471.1 Polypoid sinus degen
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 J33.1Overview

Is J33.1 (Nasal polyp) a billable code?

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

What MS-DRG does J33.1 group to?

When polypoid sinus degeneration 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 J33.1?

Under the General Equivalence Mappings, polypoid sinus degeneration converts to ICD-9-CM 471.1 (polypoid sinus degen). 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.