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ICD-10-CM 2027 diagnosis code

R09.1Pleurisy

✓ Billable / specific

R09.1 is a valid, billable ICD-10-CM code for pleurisy. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Pleurisy.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About R09.1

R09.1 is the ICD-10-CM diagnosis code for pleurisy. It belongs to category R09 (other symptoms and signs involving the circulatory and respiratory system), block R00-R09 (symptoms and signs involving the circulatory and respiratory systems) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R09 (other symptoms and signs involving the circulatory and respiratory system), R09.1 is specifically for pleurisy. Related codes cover asphyxia and hypoxemia (R09.0), respiratory arrest (R09.2), abnormal sputum (R09.3), other specified symptoms and signs involving the circulatory and respiratory systems (R09.8) and foreign body sensation of the circulatory and respiratory system (R09.A).

Don't report R09.1 together with the conditions in its Excludes1 note: pleurisy with effusion (J90).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 193 (Simple Pneumonia and Pleurisy with MCC, relative weight 1.2825), DRG 194 (Simple Pneumonia and Pleurisy with CC, relative weight 0.7888) and DRG 195 (Simple Pneumonia and Pleurisy without CC/MCC, relative weight 0.6063), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 511.0 (pleurisy without mention of effusion or current tuberculosis).

Coding notes

Excludes1Not coded here — never report together with this code
  • pleurisy with effusion (J90)

Notes that apply from higher levels

Instructions written at a parent level also apply to R09.1.

› From R09 Other symptoms and signs involving the circulatory and respiratory system
Excludes1
  • acute respiratory distress syndrome (J80)
  • respiratory arrest of newborn (P28.81)
  • respiratory distress syndrome of newborn (P22.0)
  • respiratory failure (J96.-)
  • respiratory failure of newborn (P28.5)

Broader instructions also apply from Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to R09.1.

Codes whose notes reference R09.1

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 511.0Pleurisy without mention of effusion or current tuberculosisapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about R09.1

Is R09.1 billable?

Yes. R09.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can R09.1 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict R09.1 as a principal diagnosis.

Is R09.1 a CC or MCC?

No. R09.1 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does R09.1 group to?

R09.1 is used in the MS-DRG v44.0 logic for MS-DRG 193 (Simple Pneumonia and Pleurisy with MCC), MS-DRG 194 (Simple Pneumonia and Pleurisy with CC) and MS-DRG 195 (Simple Pneumonia and Pleurisy without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for R09.1?

The CMS General Equivalence Mappings map R09.1 to ICD-9-CM 511.0.