2026 ICD-10-CM Diagnosis Code R09.1Pleurisy

ICD-10-CM Codes›R00–R99›R00-R09›R09

ICD-10-CM R09.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R09.1 is a billable ICD-10-CM diagnosis code for pleurisy. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 193 through 195. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pleurisy, pleural effusion and pulmonary collapse.

Code Identity

ICD-10-CM Code
R09.1
Billable Status
Yes — Valid for Submission
Code Describes
Pleurisy
Short Description
Pleurisy
Same as the full description in the CMS dataset.
Parent Code
R09
Other symptoms and signs involving the circulatory and respiratory system

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR00-R09Symptoms and signs involving the circulatory and respiratory systems
CategoryR09Other symptoms and signs involving the circulatory and respiratory system
This CodeR09.1Pleurisy

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute dry pleurisy
  • Asbestos pleurisy
  • Bacterial pleurisy
  • Basal pleurisy
  • Chronic dry pleurisy
  • Diaphragmatic pleurisy
  • Drug-induced pleurisy
  • Dry pleurisy
  • Fibrinous pleurisy
  • Infective pleurisy
  • Interlobar pleurisy
  • Obliterative pleuritis
  • Pleural aspergillosis
  • Pleurisy
  • Pleurisy without effusion or active tuberculosis
  • Serositis
  • Sterile pleurisy
  • Viral pleurisy

Tabular List NotesGuidance

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

Type 1 Excludes

  • pleurisy with effusion J90

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.

    • Pleurisy(acute) (adhesive) (chronic) (costal) (diaphragmatic) (double) (dry) (fibrinous) (fibrous) (interlobar) (latent) (plastic) (primary) (residual) (sicca) (sterile) (subacute) (unresolved)

Clinical ClassificationClinical

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

CCSR RSP011
Pleurisy, pleural effusion and pulmonary collapse
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Pleurisy

    inflammation of pleura, the lining of the lung. when parietal pleura is involved, there is pleuritic chest pain.

  • Tuberculosis, Pleural

    tuberculosis of the serous membrane lining the thoracic cavity and surrounding the lungs.

  • Serositis

    inflammation of a serous membrane.

Patient EducationClinical

Pleural Disorders

Your pleura is a large, thin sheet of tissue that wraps around the outside of your lungs and lines the inside of your chest cavity. Between the layers of the pleura is a very thin space. Normally it's filled with a small amount of fluid.

Read the full article at MedlinePlus

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

Convert R09.1 to ICD-9-CMHistory

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

ICD-9-CM
511.0 Pleurisy w/o effus or TB
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 R09.1Overview

Is R09.1 a billable code?

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

What MS-DRG does R09.1 group to?

When pleurisy is the principal diagnosis on an inpatient stay, it groups to MS-DRG 193, 194, 195, with relative weights from 0.6285 to 1.3144 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R09.1 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the pleurisy is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R09.1?

Under the General Equivalence Mappings, pleurisy converts to ICD-9-CM 511.0 (pleurisy w/o effus or TB). 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.