2027 ICD-10-CM Diagnosis Code J17Pneumonia in diseases classified elsewhere

ICD-10-CM Codes›J00–J99›J09-J18›J17

ICD-10-CM J17
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

J17 is a billable ICD-10-CM diagnosis code for pneumonia in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 177 through 179. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 129 closely related codes. The code is a manifestation code that cannot be reported as the principal diagnosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pneumonia (except that caused by tuberculosis).

Code Identity

ICD-10-CM Code
J17
Billable Status
Yes — Valid for Submission
Code Describes
Pneumonia in diseases classified elsewhere
Short Description
Pneumonia in diseases classified elsewhere
Same as the full description in the CMS dataset.
Chapter
J09-J18
Influenza and pneumonia

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ09-J18Influenza and pneumonia
CategoryJ17Pneumonia in diseases classified elsewhere
This CodeJ17Pneumonia in diseases classified elsewhere

Code EditsBilling

Medicare Code Editor checks that affect claim validity for J17.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Fungal pneumonia
  • Lupus disease of the lung
  • Lupus pneumonitis
  • Mononuclear interstitial pneumonitis
  • Pneumonia caused by Schistosoma japonicum
  • Pneumonia caused by Schistosoma mansoni
  • Pneumonia due to parasitic infestation
  • Pneumonia in systemic mycosis
  • Postobstructive pneumonia
  • Pulmonary schistosomiasis
  • Rheumatic pneumonitis
  • Schistosoma japonicum infection
  • Schistosoma mansoni infection

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to J17: its own notes plus those printed at block J09-J18 and Chapter 10. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • candidial pneumonia (B37.1)
  • chlamydial pneumonia (J16.0)
  • gonorrheal pneumonia (A54.84)
  • histoplasmosis pneumonia (B39.0-B39.2)
  • measles pneumonia (B05.2)
  • nocardiosis pneumonia (A43.0)
  • pneumocystosis (B59)
  • pneumonia due to Pneumocystis carinii (B59)
  • pneumonia due to Pneumocystis jirovecii (B59)
  • pneumonia in actinomycosis (A42.0)
  • pneumonia in anthrax (A22.1)
  • pneumonia in ascariasis (B77.81)
  • pneumonia in aspergillosis (B44.0-B44.1)
  • pneumonia in coccidioidomycosis (B38.0-B38.2)
  • pneumonia in cytomegalovirus disease (B25.0)
  • pneumonia in toxoplasmosis (B58.3)
  • rubella pneumonia (B06.81)
  • salmonella pneumonia (A02.22)
  • spirochetal infection NEC with pneumonia (A69.8)
  • tularemia pneumonia (A21.2)
  • typhoid fever with pneumonia (A01.03)
  • varicella pneumonia (B01.2)
  • whooping cough with pneumonia (A37 with fifth-character 1)

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 Block J09-J18 Influenza and pneumonia applies to 53 codes
  • allergic or eosinophilic pneumonia (J82)
  • aspiration pneumonia NOS (J69.0)
  • meconium pneumonia (P24.01)
  • neonatal aspiration pneumonia (P24.-)
  • pneumonia due to solids and liquids (J69.-)
  • congenital pneumonia (P23.9)
  • lipid pneumonia (J69.1)
  • rheumatic pneumonia (I00)
  • ventilator associated pneumonia (J95.851)
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)

Code First

The underlying condition named in the note is sequenced before this code.

  • underlying disease, such as:
  • Q fever (A78)
  • rheumatic fever (I00)
  • schistosomiasis (B65.0-B65.9)

Use Additional Code

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

From Block J09-J18 Influenza and pneumonia applies to 53 codes
  • code, if applicable, to identify resistance to antimicrobial drugs (Z16.-)
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)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

  • if applicable, any associated condition such as:
  • abscess (J85.1)
  • aspiration pneumonia (J69.-)

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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name J17, its category, or a range that includes it.

Use Additional Code 1

These codes say to use an additional code from the note, and J17 is one of the codes named.

  • J95.89 Other postprocedural complications and disorders of respiratory system, not elsewhere classified
    bacterial or viral pneumonia (J12-J18) names J12-J18, which includes this code

Code Also 1

These codes say J17 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • D81.82 Activated Phosphoinositide 3-kinase Delta Syndrome [APDS]
    pneumonia (J12-J18) names J12-J18, which includes this code

Clinical ClassificationClinical

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

CCSR RSP002
Pneumonia (except that caused by tuberculosis)
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Pneumonia

Pneumonia is an infection in one or both of your lungs. It causes the air sacs of your lungs to fill up with fluid or pus. Pneumonia can range from mild to severe, depending on what caused it, your age, and your overall health.

The full article covers:

  • What is pneumonia?
  • What causes pneumonia?
  • Who is more likely to develop pneumonia?
  • What are the symptoms of pneumonia?
  • What other problems can pneumonia cause?
  • How is pneumonia diagnosed?
  • What are the treatments for pneumonia?
  • Can pneumonia be prevented?

Read the full article at MedlinePlus

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

Convert J17 to ICD-9-CMHistory

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

ICD-9-CM
484.7 Pneum in oth sys mycoses
Approximate The match is approximate rather than exact.
ICD-9-CM
484.8 Pneum in infect dis NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
517.1 Rheumatic pneumonia
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 J17Overview

What is the ICD-10 code for pneumonia in diseases classified elsewhere?

The ICD-10-CM code for pneumonia in diseases classified elsewhere is J17. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is J17 (Pneumonia in diseases classified elsewhere) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pneumonia in diseases classified elsewhere on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does J17 group to?

On inpatient claims, pneumonia in diseases classified elsewhere maps to MS-DRG 179, 178, 177, with relative weights from 0.7344 to 1.6091 depending on complications. Higher weights mean higher Medicare reimbursement.

Is J17 a CC or MCC?

CMS lists J17 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 129 closely related codes in its exclusion list.

Can J17 be a principal diagnosis?

No. This is a manifestation code: pneumonia in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.