2026 ICD-10-CM Diagnosis Code J17Pneumonia in diseases classified elsewhere
ICD-10-CM Codes›J00–J99›J09-J18›J17
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Not Chronic
J17 is a billable ICD-10-CM diagnosis code for pneumonia in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) 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
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for J17.
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
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Code First
Code Also
Type 1 Excludes
- 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
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Schistosoma Japonicum Infection
an infection that is caused by schistosoma japonicum.Schistosoma Mansoni Infection
an infection that is caused by schistosoma mansoni.
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.
Code HistoryHistory
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, 2025 through September 30, 2026.
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, 2025 through September 30, 2026.
What MS-DRG does J17 group to?
On inpatient claims, pneumonia in diseases classified elsewhere maps to MS-DRG 177, 178, 179, with relative weights from 0.7550 to 1.5627 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 2026. 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.
