Respiratory disorders in diseases classified elsewhere (J99) ICD-10-CM
The J99 code range covers respiratory disorders in diseases classified elsewhere with 1 ICD-10-CM diagnosis codes. 1 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
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.
- underlying disease, such as:
- amyloidosis E85
- ankylosing spondylitis M45
- congenital syphilis A50
- cryoglobulinemia D89.1
- early congenital syphilis A50.0
- plasminogen deficiency E88.02
- schistosomiasis B65.0 B65.9
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.
- respiratory disorders in:
- amebiasis A06.5
- blastomycosis B40.0 B40.2
- candidiasis B37.1
- coccidioidomycosis B38.0 B38.2
- cystic fibrosis with pulmonary manifestations E84.0
- dermatomyositis M33.01 M33.11
- histoplasmosis B39.0 B39.2
- late syphilis A52.72 A52.73
- polymyositis M33.21
- Sjögren syndrome M35.02
- systemic lupus erythematosus M32.13
- systemic sclerosis M34.81
- Wegener's granulomatosis M31.30 M31.31
Codes in the J99 Range 1 codes · 1 billable
- J99 Respiratory disorders in diseases classified elsewhere
About the J99 Code Range
The ICD-10 code J99 covers respiratory disorders that occur as a result of other diseases classified elsewhere in the medical system. This code is essential for documenting lung and respiratory system problems linked directly to underlying conditions rather than primary lung diseases.
J99 is used for a wide variety of respiratory complications including restrictive lung diseases caused by neuromuscular conditions like amyotrophic lateral sclerosis and Parkinson disease, as well as pulmonary involvement in systemic diseases such as connective tissue disorders and vasculitis. It also applies to infections like pulmonary histoplasmosis—often referred to as African histoplasmosis or pneumonia caused by Histoplasma capsulatum—and respiratory issues occurring with HIV/AIDS. By associating these respiratory disorders with their root causes, the ICD-10 code for respiratory disorders in diseases classified elsewhere aids medical coders and clinicians in capturing complex cases where lung problems are secondary to other illnesses. This distinction is crucial for precise diagnosis, treatment planning, and health data accuracy.
Questions About This Page
How many billable codes are in the J99 range?
Of the 1 codes in this range, 1 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the J99 range classify?
The range classifies respiratory disorders in diseases classified elsewhere. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
