2026 ICD-10-CM Diagnosis Code J01.90Acute sinusitis, unspecified

ICD-10-CM Codes›J00–J99›J00-J06›J01

ICD-10-CM J01.90
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J01.90 is a billable ICD-10-CM diagnosis code for acute sinusitis, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 152 through 153. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sinusitis.

Code Identity

ICD-10-CM Code
J01.90
Billable Status
Yes — Valid for Submission
Code Describes
Acute sinusitis, unspecified
Short Description
Acute sinusitis, unspecified
Same as the full description in the CMS dataset.
Parent Code
J01.9
Acute sinusitis, unspecified

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ00-J06Acute upper respiratory infections
CategoryJ01Acute sinusitis
This CodeJ01.90Acute sinusitis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abscess of nasal sinus
  • Acute abscess of nasal sinus
  • Acute bacterial sinusitis
  • Acute empyema of nasal sinus
  • Acute rhinosinusitis
  • Acute sinusitis
  • Acute sinusitis caused by fungus
  • Acute sinusitis caused by virus
  • Acute suppuration of nasal sinus
  • Bacterial sinusitis
  • Empyema of nasal sinus
  • Fungal sinusitis
  • Rhinosinusitis
  • Viral sinusitis

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.

    • Sinusitis(accessory) (chronic) (hyperplastic) (nasal) (nonpurulent) (purulent)
      • acute

Clinical ClassificationClinical

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

CCSR RSP001
Sinusitis
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.

  • Acute Sinusitis

    sinusitis lasting less than or equal to thirty days.

  • Rhinosinusitis

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

Patient EducationClinical

Sinusitis

Sinusitis means your sinuses are inflamed. The cause can be an infection or another problem. Your sinuses are hollow air spaces within the bones surrounding the nose. They produce mucus, which drains into the nose. If your nose is swollen, this can block the sinuses and cause pain.

Read the full article at MedlinePlus

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

Convert J01.90 to ICD-9-CMHistory

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

ICD-9-CM
461.9 Acute sinusitis NOS
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 J01.90Overview

Is J01.90 (Acute sinusitis, unspecified) a billable code?

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

What MS-DRG does J01.90 group to?

When acute sinusitis, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 152, 153, with relative weights from 0.7382 to 1.1822 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of J01.90?

Under the General Equivalence Mappings, acute sinusitis, unspecified converts to ICD-9-CM 461.9 (acute sinusitis NOS). 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.