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  2. ICD-10-CM Codes List
  3. J00–J99
  4. J09-J18
  5. Pneumonia due to other infectious organisms, not elsewhere classified (J16)

Pneumonia due to other infectious organisms, not elsewhere classified (J16)

ICD-10 code J16 covers pneumonia caused by infectious organisms that do not fit into other specific categories. This includes cases like chlamydial pneumonia (J16.0) and pneumonia due to various other less common infectious agents classified under J16.8.

The ICD-10 code for chlamydial pneumonia (J16.0) is used when the lung infection is caused by bacteria in the Chlamydiaceae family, also known as Chlamydia pneumoniae infection. This code helps distinguish these bacterial pneumonias from others like those caused by tuberculosis or viral agents. Meanwhile, J16.8 covers pneumonia caused by a wide range of other infectious organisms, including parasitic infestations such as pulmonary filariasis or schistosomiasis, fungal lung infections, rickettsial pneumonia, and infestations by specific organisms like Pneumonyssus. By using these codes, healthcare professionals can accurately document pneumonia cases involving less common pathogens, ensuring appropriate diagnosis and treatment tracking.

Instructional Notations

Code First

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.

Code Also

A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.

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

Type 1 Excludes

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.

  • congenital pneumonia P23
  • ornithosis A70
  • pneumocystosis B59
  • pneumonia NOS J18.9

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Chlamydial Pneumonia

Pneumonia caused by infections with the genus CHLAMYDIA; and CHLAMYDOPHILA, usually with CHLAMYDOPHILA PNEUMONIAE.