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ICD-10-CM 2027 diagnosis code

J15.5Pneumonia due to Escherichia coli

✓ Billable / specificMCC — major complication/comorbidity

J15.5 is a valid, billable ICD-10-CM code for pneumonia due to escherichia coli. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 J15.5

J15.5 is the ICD-10-CM diagnosis code for pneumonia due to Escherichia coli. It belongs to category J15 (bacterial pneumonia, not elsewhere classified), block J09-J18 (influenza and pneumonia) and chapter 10 (diseases of the respiratory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within J15 (bacterial pneumonia, not elsewhere classified), J15.5 is specifically for pneumonia due to Escherichia coli. Related codes cover pneumonia due to Klebsiella pneumoniae (J15.0), pneumonia due to Pseudomonas (J15.1), pneumonia due to staphylococcus (J15.2), pneumonia due to streptococcus, group B (J15.3), pneumonia due to other streptococci (J15.4), pneumonia due to other Gram-negative bacteria (J15.6), pneumonia due to Mycoplasma pneumoniae (J15.7), pneumonia due to other specified bacteria (J15.8) and 1 more.

Code first: , if applicable, associated influenza (J09.X1, J10.0-, J11.0-).

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 177 (Respiratory Infections and Inflammations with MCC, relative weight 1.6092), DRG 178 (Respiratory Infections and Inflammations with CC, relative weight 0.9744), DRG 179 (Respiratory Infections and Inflammations without CC/MCC, relative weight 0.7345), DRG 791 (Prematurity with Major Problems, relative weight 4.1075), DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), DRG 974 (HIV with Major Related Condition with MCC, relative weight 3.0506) and 2 more, in MDC 04 (Diseases and Disorders of the Respiratory System), MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period) and MDC 25 (Human Immunodeficiency Virus Infections), 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 482.82 (pneumonia due to escherichia coli [E. coli]).

Notes that apply from higher levels

Instructions written at a parent level also apply to J15.5.

› From J15 Bacterial pneumonia, not elsewhere classified
Includes
  • bronchopneumonia due to bacteria other than S. pneumoniae and H. influenzae
Excludes1
  • chlamydial pneumonia (J16.0)
  • congenital pneumonia (P23.-)
  • Legionnaires' disease (A48.1)
  • spirochetal pneumonia (A69.8)
Code first
Code also
  • , if applicable, any associated condition such as:
  • abscess (J85.1)
  • aspiration pneumonia (J69.-)

Broader instructions also apply from J09-J18 Influenza and pneumonia and Chapter 10: Diseases of the respiratory system.

Alphabetic index entries

4 entries

Terms in the official ICD-10-CM index that lead to J15.5.

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.

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

ICD-9-CM equivalent

Converter →
  • 482.82Pneumonia due to escherichia coli [E. coli]exact

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 J15.5

Is J15.5 billable?

Yes. J15.5 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can J15.5 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict J15.5 as a principal diagnosis.

Is J15.5 a CC or MCC?

J15.5 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does J15.5 group to?

J15.5 is used in the MS-DRG v44.0 logic for MS-DRG 177 (Respiratory Infections and Inflammations with MCC), MS-DRG 178 (Respiratory Infections and Inflammations with CC), MS-DRG 179 (Respiratory Infections and Inflammations without CC/MCC), MS-DRG 791 (Prematurity with Major Problems), MS-DRG 793 (Full Term Neonate with Major Problems), MS-DRG 974 (HIV with Major Related Condition with MCC) and 2 more. 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 J15.5?

The CMS General Equivalence Mappings map J15.5 to ICD-9-CM 482.82.