ICD-10-CM 2027 diagnosis code
J99Respiratory disorders in diseases classified elsewhere
J99 is a valid, billable ICD-10-CM code for respiratory disorders in diseases classified elsewhere. 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 J99
J99 is the ICD-10-CM diagnosis code for respiratory disorders in diseases classified elsewhere. It belongs to block J96-J99 (other diseases of the respiratory system) 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.
Don't report J99 together with the conditions in its Excludes1 note: amebiasis (A06.5), blastomycosis (B40.0-B40.2), candidiasis (B37.1), coccidioidomycosis (B38.0-B38.2) and 9 more.
Code first underlying disease, such as: amyloidosis (E85.-), ankylosing spondylitis (M45.-), bronchomycosis (B49), congenital syphilis (A50.-) and 4 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 196 (Interstitial Lung Disease with MCC, relative weight 1.8336), DRG 197 (Interstitial Lung Disease with CC, relative weight 0.9492) and DRG 198 (Interstitial Lung Disease without CC/MCC, relative weight 0.7259), in MDC 04 (Diseases and Disorders of the Respiratory System), 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 is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.
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 517.8 (lung involvement in other diseases classified elsewhere).
Coding notes
- 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)
Notes that apply from higher levels
Instructions written at a parent level also apply to J99.
Broader instructions also apply from Chapter 10: Diseases of the respiratory system.
Codes whose notes reference J99
- E88.02Use additional code
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 04 · Diseases and Disorders of the Respiratory System
ICD-9-CM equivalent
Converter →- 517.8Lung involvement in other diseases classified elsewhereapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about J99
Is J99 billable?
- Yes. J99 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J99 be used as a principal diagnosis?
- No. It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.
Is J99 a CC or MCC?
- No. J99 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does J99 group to?
- J99 is used in the MS-DRG v44.0 logic for MS-DRG 196 (Interstitial Lung Disease with MCC), MS-DRG 197 (Interstitial Lung Disease with CC) and MS-DRG 198 (Interstitial Lung Disease without CC/MCC). 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 J99?
- The CMS General Equivalence Mappings map J99 to ICD-9-CM 517.8.