2026 ICD-10-CM Diagnosis Code J34.1Cyst and mucocele of nose and nasal sinus

ICD-10-CM Codes›J00–J99›J30-J39›J34

ICD-10-CM J34.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J34.1 is a billable ICD-10-CM diagnosis code for cyst and mucocele of nose and nasal 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified upper respiratory disease.

Code Identity

ICD-10-CM Code
J34.1
Billable Status
Yes — Valid for Submission
Code Describes
Cyst and mucocele of nose and nasal sinus
Short Description
Cyst and mucocele of nose and nasal sinus
Same as the full description in the CMS dataset.
Parent Code
J34
Other and unspecified disorders of nose and nasal sinuses

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ30-J39Other diseases of upper respiratory tract
CategoryJ34Other and unspecified disorders of nose and nasal sinuses
This CodeJ34.1Cyst and mucocele of nose and nasal sinus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cyst of ethmoid sinus
  • Cyst of frontal sinus
  • Cyst of maxillary sinus
  • Cyst of nasal cavity
  • Cyst of nasal sinus
  • Cyst of sphenoid sinus
  • Infection of mucous cyst of nasal sinus
  • Mucocele of ethmoid sinus
  • Mucocele of frontal sinus
  • Mucocele of maxillary sinus
  • Mucocele of nasal cavity
  • Mucopyocele
  • Nasal sinus mucocele
  • Surgical ciliated cyst

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.

    • Cyst(colloid) (mucous) (simple) (retention)
      • antrum
    • Cyst(colloid) (mucous) (simple) (retention)
      • ethmoid sinus
    • Cyst(colloid) (mucous) (simple) (retention)
      • frontal sinus
    • Cyst(colloid) (mucous) (simple) (retention)
      • nose (turbinates)
    • Cyst(colloid) (mucous) (simple) (retention)
      • nose (turbinates)
        • sinus
    • Cyst(colloid) (mucous) (simple) (retention)
      • sinus (accessory) (nasal)
    • Cyst(colloid) (mucous) (simple) (retention)
      • sphenoid sinus
    • Cyst(colloid) (mucous) (simple) (retention)
      • turbinate (nose)
    • Mucocele
      • nasal sinus
    • Mucocele
      • nose
    • Mucocele
      • sinus (accessory) (nasal)
    • Mucocele
      • turbinate (bone) (middle) (nasal)

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

  • Surgical Ciliated Cyst

    a rare cyst that results from traumatic (usually surgical) implantation of respiratory epithelium in the jaw bones.

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 J34.1 to ICD-9-CMHistory

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

ICD-9-CM
478.19 Nasal & sinus dis NEC
Approximate The match is approximate rather than exact.

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 J34.1Overview

Is J34.1 (Other and unspecified disorders of nose and nasal sinuses) a billable code?

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

What MS-DRG does J34.1 group to?

When cyst and mucocele of nose and nasal 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 J34.1?

Under the General Equivalence Mappings, cyst and mucocele of nose and nasal sinus converts to ICD-9-CM 478.19 (nasal & sinus dis NEC). The mapping is approximate, so confirm the match fits the documentation.

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.