2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 154 through 156, 795. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to J34.1: its own notes plus those printed at J34 and Chapter 10. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From J34 Other and unspecified disorders of nose and nasal sinuses applies to 19 codes
  • varicose ulcer of nasal septum (I86.8)
From Chapter 10 (J00-J99) Diseases of the respiratory system applies to 366 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • smoke inhalation (T59.81-)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 10 (J00-J99) Diseases of the respiratory system applies to 366 codes
  • code, where applicable, to identify:
  • exposure to environmental tobacco smoke (Z77.22)
  • exposure to tobacco smoke in the perinatal period (P96.81)
  • history of tobacco dependence (Z87.891)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Notes

General instructions on how these codes are used.

From Chapter 10 (J00-J99) Diseases of the respiratory system applies to 366 codes
  • When a respiratory condition is described as occurring in more than one site and is not specifically indexed, it should be classified to the lower anatomic site (e.g. tracheobronchitis to bronchitis in J40).

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About J34.1Overview

What is the ICD-10 code for cyst and mucocele of nose and nasal sinus?

The ICD-10-CM code for cyst and mucocele of nose and nasal sinus is J34.1 (sometimes written as J341). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 156, 795, 155, 154, with relative weights from 0.2022 to 1.5916 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.